LTC6247CTS8 [Linear]
180MHz, 1mA Power Efficient Rail-to-Rail I/O Op Amps; 180MHz的， 1毫安高效电源轨到轨输入/输出运算放大器
| 型号： | LTC6247CTS8 |
| 厂家： | 
Linear |
| 描述： | 180MHz, 1mA Power Efficient Rail-to-Rail I/O Op Amps |
| 文件： | 总24页 (文件大小：481K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC6246/LTC6247/LTC6248
180MHz, 1mA Power
Efficient Rail-to-Rail
I/O Op Amps
FeaTures
DescripTion
TheLTC®6246/LTC6247/LTC6248aresingle/dual/quadlow
power,highspeedunitygainstablerail-to-railinput/output
operationalamplifiers.Ononly1mAofsupplycurrentthey
feature an impressive 180MHz gain-bandwidth product,
90V/µs slew rate and a low 4.2nV/√Hz of input-referred
noise. The combination of high bandwidth, high slew rate,
low power consumption and low broadband noise makes
these amplifiers unique among rail-to-rail input/output op
ampswithsimilarsupplycurrents. Theyareidealforlower
supply voltage high speed signal conditioning systems.
n
Gain Bandwidth Product: 180MHz
n
–3dB Frequency (A = 1): 120MHz
V
n
Low Quiescent Current: 1mA Max
n
High Slew Rate: 90V/µs
n
Input Common Mode Range Includes Both Rails
n
Output Swings Rail-to-Rail
n
Low Broadband Voltage Noise: 4.2nV/√Hz
n
Power-Down Mode: 42μA
Fast Output Recovery
n
n
Supply Voltage Range: 2.5V to 5.25V
n
Input Offset Voltage: 0.5mV Max
TheLTC6246familymaintainshighefficiencyperformance
from supply voltage levels of 2.5V to 5.25V and is fully
specified at supplies of 2.7V and 5.0V.
n
Input Bias Current: 100nA
n
Large Output Current: 50mA
n
CMRR: 110dB
n
For applications that require power-down, the LTC6246
and the LTC6247 in MS10 offer a shutdown pin which
disables the amplifier and reduces current consumption
to 42µA.
Open Loop Gain: 45V/mV
n
Operating Temperature Range: –40°C to 125°C
n
Single in 6-Pin TSOT-23
n
Dual in MS8, 2mm × 2mm Thin DFN,TS0T-23, MS10
n
Quad in MS16
The LTC6246 family can be used as a plug-in replacement
formanycommerciallyavailableopampstoreducepower
or to improve input/output range and performance.
applicaTions
n
Low Voltage, High Frequency Signal Processing
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
n
Driving A/D Converters
n
Rail-to-Rail Buffer Amplifiers
Active Filters
Video Amplifiers
Fast Current Sensing Amplifiers
Battery Powered Equipment
n
n
n
n
Typical applicaTion
350kHz FFT Driving ADC
0
f
f
= 350.195kHz
SAMP
IN
Low Noise Low Distortion Gain = 2 ADC Driver
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
= 2.2Msps
SFDR = 82dB
SNR = 70dB
1024 POINT FFT
3.3V 2.5V
3.3V
V
DD
V
REF
CS
SDO
SCK
V
IN
+
A
IN
LTC6246
LTC2366
GND
–
OV
DD
499Ω
1%
624678 TA01a
499Ω
1%
10pF
0
200
400
600
800
1000
FREQUENCY (kHz)
624678 TA01b
624678fa
ꢀ
LTC6246/LTC6247/LTC6248
(Note 1)
absoluTe MaxiMuM raTings
+
–
Total Supply Voltage (V to V )................................5.5V
Input Current (+IN, –IN, SHDN) (Note 2).............. 10mA
Output Current (Note 3) ..................................... 100mA
Operating Temperature Range (Note 4) . –40°C to 125°C
Specified Temperature Range (Note 5) .. –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
Junction Temperature ........................................... 150°C
Lead Temperature (Soldering, 10 sec)
(MSOP, TSOT Packages Only)...............................300°C
pin conFiguraTion
TOP VIEW
TOP VIEW
TOP VIEW
+
OUT A
–IN A
+IN A
1
2
3
4
8
7
6
5
V
+
+
1
2
3
4
5
10
9
V
OUT A
–IN A
+IN A
OUT A
–IN A
+IN A
1
2
3
4
8 V
–
+
–
+
–
+
OUT B
–IN B
+IN B
OUT B
–IN B
+IN B
SHDNB
7 OUT B
6 –IN B
5 +IN B
–
+
–
+
8
–
+
–
V
7
6
–
–
V
V
9
SHDNA
MS8 PACKAGE
8-LEAD PLASTIC MSOP
MS PACKAGE
10-LEAD PLASTIC MSOP
KC PACKAGE
8-LEAD PLASTIC UTDFN (2mm s 2mm)
T
= 150°C, θ = 163°C/W (NOTE 9)
JMAX
JA
T
= 150°C, θ = 160°C/W (NOTE 9)
JMAX
JA
T
= 125°C, θ = 102°C/W (NOTE 9)
JMAX
JA
–
EXPOSED PAD (PIN 9) IS V , MUST BE SOLDERED TO PCB
TOP VIEW
TOP VIEW
+
TOP VIEW
+
1
2
3
4
5
6
7
8
OUT A
–IN A
+IN A
16 OUT D
15 –IN D
–
+
–
+
OUT A 1
–IN A 2
8 V
OUT 1
–
6 V
14 +IN D
–
+
+
–
7 OUT B
6 –IN B
5 +IN B
V
13 V
V
2
5 SHDN
4 –IN
+
–
+
–
+
–
+
–
+IN B
–IN B
OUT B
12 +IN C
11 –IN C
10 OUT C
9
+IN A 3
–
+IN 3
V
4
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
MS PACKAGE
16-LEAD PLASTIC MSOP
= 150°C, θ = 125°C/W (NOTE 9)
T
= 150°C, θ = 195°C/W (NOTE 9)
T
= 150°C, θ = 192°C/W (NOTE 9)
JMAX
JA
JMAX
JA
T
JMAX
JA
orDer inForMaTion
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
LTDWF
PACKAGE DESCRIPTION
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
6-Lead Plastic TSOT-23
8-Lead (2mm × 2mm) UTDFN
8-Lead (2mm × 2mm) UTDFN
8-Lead Plastic MSOP
SPECIFIED TEMPERATURE RANGE
0°C to 70°C
LTC6246CS6#TRMPBF
LTC6246IS6#TRMPBF
LTC6246HS6#TRMPBF
LTC6247CKC#TRMPBF
LTC6247IKC#TRMPBF
LTC6247CMS8#PBF
LTC6246CS6#TRPBF
LTC6246IS6#TRPBF
LTC6246HS6#TRPBF
LTC6247CKC#TRPBF
LTC6247IKC#TRPBF
LTC6247CMS8#TRPBF
LTC6247IMS8#TRPBF
LTC6247CTS8#TRPBF
LTC6247ITS8#TRPBF
LTC6247HTS8#TRPBF
LTDWF
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
LTDWF
DWJT
DWJT
–40°C to 85°C
0°C to 70°C
LTDWH
LTDWH
LTDWK
LTDWK
LTDWK
LTC6247IMS8#PBF
8-Lead Plastic MSOP
–40°C to 85°C
0°C to 70°C
LTC6247CTS8#TRMPBF
LTC6247ITS8#TRMPBF
LTC6247HTS8#TRMPBF
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
–40°C to 85°C
–40°C to 125°C
624678fa
ꢁ
LTC6246/LTC6247/LTC6248
orDer inForMaTion
LEAD FREE FINISH
LTC6247CMS#PBF
LTC6247IMS#PBF
LTC6248CMS#PBF
LTC6248IMS#PBF
LTC6248HMS#PBF
TAPE AND REEL
PART MARKING*
LTDWM
LTDWM
6248
PACKAGE DESCRIPTION
10-Lead Plastic MSOP
10-Lead Plastic MSOP
16-Lead Plastic MSOP
16-Lead Plastic MSOP
16-Lead Plastic MSOP
SPECIFIED TEMPERATURE RANGE
0°C to 70°C
LTC6247CMS#TRPBF
LTC6247IMS#TRPBF
LTC6248CMS#TRPBF
LTC6248IMS#TRPBF
LTC6248HMS#TRPBF
–40°C to 85°C
0°C to 70°C
6248
–40°C to 85°C
6248
–40°C to 125°C
TRM = 500 pieces. *Temperature grades are identified by a label on the shipping container.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
(V = 5V) The l denotes the specifications which apply across the
elecTrical characTerisTics
S
specified temperature range, otherwise specifications are at TA = 25°C. For each amplifier VS = 5V, 0V; VSHDN = 2V; VCM = VOUT = 2.5V,
unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
V
V
V
V
= Half Supply
–500
50
500
µV
µV
OS
CM
CM
CM
CM
l
l
l
–1000
1000
+
= V – 0.5V, NPN Mode
–2.5
–3
0.1
50
2.5
3
mV
mV
Input Offset Voltage Match
(Channel-to-Channel) (Note 8)
= Half Supply
–600
–1000
600
1000
µV
µV
∆V
OS
+
= V – 0.5V, NPN Mode
–3.5
–4
0.1
3.5
4
mV
mV
l
l
V
OS
T
C
Input Offset Voltage Drift
Input Bias Current (Note 7)
–2
µV/°C
I
V
CM
V
CM
V
CM
V
CM
= Half Supply
–350
–550
–30
350
550
nA
nA
B
l
l
l
l
+
= V – 0.5V, NPN Mode
100
0
400
–10
–10
1000
1500
nA
nA
I
OS
Input Offset Current
= Half Supply
–250
–400
250
400
nA
nA
+
= V – 0.5V, NPN Mode
–250
–400
250
400
nA
nA
e
Input Noise Voltage Density
Input 1/f Noise Voltage
Input Noise Current Density
Input Capacitance
f = 100kHz
4.2
1.6
2.0
nV/√Hz
n
f = 0.1Hz to 10Hz
f = 100kHz
µV
P-P
i
n
pA/√Hz
C
Differential Mode
Common Mode
2
0.8
pF
pF
IN
R
Input Resistance
Differential Mode
Common Mode
32
14
kΩ
MΩ
IN
A
Large Signal Voltage Gain
R = 1k to Half Supply (Note 10)
30
14
45
V/mV
V/mV
VOL
L
l
l
l
R = 100Ω to Half Supply (Note 10)
L
5
2.5
15
V/mV
V/mV
CMRR
Common Mode Rejection Ratio
V
CM
= 0V to 3.5V
78
76
110
dB
dB
624678fa
ꢂ
LTC6246/LTC6247/LTC6248
elecTrical characTerisTics
(V = 5V) The l denotes the specifications which apply across the
S
specified temperature range, otherwise specifications are at TA = 25°C. For each amplifier VS = 5V, 0V; VSHDN = 2V; VCM = VOUT = 2.5V,
unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
l
I
Input Common Mode Range
Power Supply Rejection Ratio
0
V
V
CMR
S
PSRR
V = 2.5V to 5.25V
CM
69
65
73
dB
dB
S
l
l
V
= 1V
Supply Voltage Range (Note 6)
2.5
5.25
V
–
V
Output Swing Low (V
– V )
No Load
25
70
40
55
mV
mV
OL
OH
OUT
l
l
l
l
l
l
l
l
l
l
l
l
I
I
= 5mA
110
160
mV
mV
SINK
= 25mA
160
70
250
450
mV
mV
SINK
+
V
Output Swing High (V – V
)
No Load
100
150
mV
mV
OUT
I
I
= 5mA
130
300
–80
100
0.95
1.25
42
175
225
mV
mV
SOURCE
= 25mA
500
750
mV
mV
SOURCE
I
I
Output Short-Circuit Current
Supply Current per Amplifier
Sourcing
Sinking
–35
–30
mA
mA
SC
60
40
mA
mA
V
V
V
V
V
= Half Supply
1
1.4
mA
mA
S
CM
+
= V – 0.5V
1.4
1.8
mA
mA
CM
I
I
I
Disable Supply Current per Amplifier
SHDN Pin Current Low
= 0.8V
= 0.8V
= 2V
75
200
µA
µA
SD
SHDN
SHDN
SHDN
–3
–4
–1.6
35
0
0
µA
µA
SHDNL
SHDNH
SHDN Pin Current High
–300
–350
300
350
nA
nA
l
l
l
V
V
SHDN Pin Input Voltage Low
SHDN Pin Input Voltage High
0.8
V
V
L
2
H
I
Output Leakage Current Magnitude in
Shutdown
V
= 0.8V, Output Shorted to Either
100
nA
OSD
SHDN
Supply
t
t
Turn-On Time
V
= 0.8V to 2V
= 2V to 0.8V
5
µs
µs
ON
SHDN
SHDN
Turn-Off Time
V
2
OFF
BW
–3dB Closed Loop Bandwidth
Gain-Bandwidth Product
A = 1, R = 1k to Half Supply
120
180
MHz
V
L
GBW
f = 2MHz, R = 1k to Half Supply
100
70
MHz
MHz
L
l
t , 0.1%
Settling Time to 0.1%
Settling Time to 0.01%
Slew Rate
A = –1, V = 2V Step R = 1k
74
202
90
ns
ns
S
V
O
L
t , 0.01%
S
A = –1, V = 2V Step R = 1k
V O L
SR
A = –3.33, 4.6V Step (Note 11)
V
60
50
V/µs
V/µs
l
FPBW
Full Power Bandwidth
V
OUT
= 4V (Note 13)
4
MHz
P-P
624678fa
ꢃ
LTC6246/LTC6247/LTC6248
(V = 5V) The l denotes the specifications which apply across the
elecTrical characTerisTics
S
specified temperature range, otherwise specifications are at TA = 25°C. For each amplifier VS = 5V, 0V; VSHDN = 2V; VCM = VOUT = 2.5V,
unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
f = 100kHz, V = 2V
P-P
MIN
TYP
MAX
UNITS
HD2/HD3
Harmonic Distortion
110/90
88/80
78/62
dBc
dBc
dBc
C
O
R = 1k to Half Supply
f = 1MHz, V = 2V
L
C O P-P
f = 2MHz, V = 2V
P-P
C
O
R = 100Ω to Half Supply
L
f = 100kHz, V = 2V
P-P
90/79
66/60
59/51
C
O
f = 1MHz, V = 2V
C
O
P-P
f = 2MHz, V = 2V
C
O
P-P
Differential Gain (Note 14)
Differential Phase (Note 14)
Crosstalk
A = 1, R = 1k, V = 2.5V
0.2
0.08
–90
%
Deg
dB
∆G
V
L
S
A = 1, R = 1k, V = 2.5V
∆θ
V
L
S
A = –1, R = 1k to Half Supply,
V
OUT
L
V
= 2V , f = 1MHz
P-P
(V = 2.7V) The l denotes the specifications which apply across the
elecTrical characTerisTics
S
specified temperature range, otherwise specifications are at TA = 25°C. For each amplifier VS = 2.7V, 0V; VSHDN = 2V; VCM = VOUT
1.35V, unless otherwise noted.
=
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
V
V
V
V
= Half Supply
–100
–300
500
1000
1400
µV
µV
OS
CM
CM
CM
CM
l
l
l
+
= V – 0.5V, NPN Mode
–1.75
–2.25
0.75
–20
0.1
3.25
3.75
mV
mV
Input Offset Voltage Match
(Channel-to-Channel) (Note 8)
= Half Supply
–700
–1000
700
1000
µV
µV
∆V
OS
+
= V – 0.5V, NPN Mode
–3.5
–4
3.5
4
mV
mV
l
l
V
OS
T
C
Input Offset Voltage Drift
Input Bias Current (Note 7)
2
µV/°C
I
B
V
CM
V
CM
V
CM
V
CM
= Half Supply
–450
–600
–100
450
600
nA
nA
l
l
l
l
+
= V – 0.5V, NPN Mode
50
0
350
–10
–10
1000
1500
nA
nA
I
OS
Input Offset Current
= Half Supply
–250
–350
250
350
nA
nA
+
= V – 0.5V, NPN Mode
–250
–350
250
350
nA
nA
e
Input Noise Voltage Density
Input 1/f Noise Voltage
Input Noise Current Density
Input Capacitance
f = 100kHz
4.6
1.7
1.8
nV/√Hz
n
f = 0.1Hz to 10Hz
f = 100kHz
µV
P-P
i
n
pA/√Hz
C
Differential Mode
Common Mode
2
0.8
pF
pF
IN
R
IN
Input Resistance
Differential Mode
Common Mode
32
12
kΩ
MΩ
A
VOL
Large Signal Voltage Gain
R = 1k to Half Supply
15
25
V/mV
V/mV
L
l
l
(Note 12)
7.5
R = 100Ω to Half Supply
2
1.3
7.5
V/mV
V/mV
L
(Note 12)
624678fa
ꢄ
LTC6246/LTC6247/LTC6248
elecTrical characTerisTics
(V = 2.7V) The l denotes the specifications which apply across the
S
specified temperature range, otherwise specifications are at TA = 25°C. For each amplifier VS = 2.7V, 0V; VSHDN = 2V; VCM = VOUT
1.35V, unless otherwise noted.
=
SYMBOL
PARAMETER
CONDITIONS
= 0V to 1.2V
MIN
TYP
MAX
UNITS
CMRR
Common Mode Rejection Ratio
V
80
78
100
dB
dB
CM
l
l
I
Input Common Mode Range
Power Supply Rejection Ratio
0
V
S
V
CMR
PSRR
V = 2.5V to 5.25V
69
65
73
dB
dB
S
CM
l
l
V
= 1V
Supply Voltage Range (Note 6)
2.5
5.25
V
–
V
Output Swing Low (V
– V )
No Load
20
80
40
55
mV
mV
OL
OH
OUT
l
l
l
l
l
l
l
l
l
l
l
l
I
I
= 5mA
125
160
mV
mV
SINK
= 10mA
110
60
175
225
mV
mV
SINK
+
V
Output Swing High (V – V
Short Circuit Current
)
No Load
85
100
mV
mV
OUT
I
I
= 5mA
135
180
–35
50
190
225
mV
mV
SOURCE
= 10mA
275
400
mV
mV
SOURCE
I
I
Sourcing
Sinking
–20
–15
mA
mA
SC
25
20
mA
mA
Supply Current per Amplifier
V
V
V
V
V
= Half Supply
0.89
1
1
1.3
mA
mA
S
CM
+
= V – 0.5V
1.3
1.7
mA
mA
CM
I
I
I
Disable Supply Current per Amplifier
SHDN Pin Current Low
= 0.8V
= 0.8V
= 2V
22
50
90
µA
µA
SD
SHDN
SHDN
SHDN
–1
–1.5
–0.5
45
0
0
µA
µA
SHDNL
SHDNH
SHDN Pin Current High
–300
–350
300
350
nA
nA
l
l
l
V
V
SHDN Pin Input Voltage
0.8
V
V
L
SHDN Pin Input Voltage
2.0
H
I
Output Leakage Current Magnitude in Shutdown
V
= 0.8V, Output Shorted to Either
100
nA
OSD
SHDN
Supply
t
t
Turn-On Time
V
V
= 0.8V to 2V
= 2V to 0.8V
5
µs
µs
ON
SHDN
SHDN
Turn-Off Time
2
OFF
BW
–3dB Closed Loop Bandwidth
Gain-Bandwidth Product
A = 1, R = 1k to Half Supply
100
150
MHz
MHz
V
L
GBW
f = 2MHz, R = 1k to Half Supply
80
50
L
l
t , 0.1
Settling Time to 0.1%
Settling Time to 0.01%
Slew Rate
A = –1, V = 2V Step R = 1k
119
170
55
ns
ns
S
V
O
L
t , 0.01
S
A = –1, V = 2V Step R = 1k
V O L
SR
A = –1, 2V Step
V
V/µs
624678fa
ꢅ
LTC6246/LTC6247/LTC6248
elecTrical characTerisTics
(V = 2.7V) The l denotes the specifications which apply across the
S
specified temperature range, otherwise specifications are at TA = 25°C. For each amplifier VS = 2.7V, 0V; VSHDN = 2V; VCM = VOUT
1.35V, unless otherwise noted.
=
SYMBOL
PARAMETER
CONDITIONS
V = 2V (Note 13)
OUT
MIN
TYP
3.3
MAX
UNITS
MHz
dB
FPBW
Full Power Bandwidth
Crosstalk
P-P
A = –1, R = 1k to Half Supply,
–90
V
OUT
L
V
= 2V , f = 1MHz
P-P
Note 6: Minimum supply voltage is guaranteed by power supply rejection
ratio test.
Note 7: The input bias current is the average of the average of the currents
through the positive and negative input pins.
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The inputs are protected by back-to-back diodes. If any of
the input or shutdown pins goes 300mV beyond either supply or the
differential input voltage exceeds 1.4V the input current should be limited
to less than 10mA. This parameter is guaranteed to meet specified
performance through design and/or characterization. It is not production
tested.
Note 8: Matching parameters are the difference between amplifiers A and
D and between B and C on the LTC6248; between the two amplifiers on the
LTC6247.
Note 9: Thermal resistance varies with the amount of PC board metal
connected to the package. The specified values are with short traces
connected to the leads with minimal metal area.
Note 3: A heat sink may be required to keep the junction temperature
below the absolute maximum rating when the output current is high.
Note 10: The output voltage is varied from 0.5V to 4.5V during
measurement.
Note 4: The LTC6246C/LTC6247C/LTC6248C and LTC6246I/LTC6247I/
LTC6248I are guaranteed functional over the temperature range of –40°C
to 85°C. The LTC6246H/LTC6247H/LTC6248H are guaranteed functional
over the temperature range of –40°C to 125°C.
Note 11: Middle 80% of the output waveform is observed. R = 1k at half
supply.
Note 12: The output voltage is varied from 0.5V to 2.2V during
measurement.
L
Note 5: The LTC6246C/LTC6247C/LTC6248C are guaranteed to meet
specified performance from 0°C to 70°C. The LTC6246C/LTC6247C/
LTC6248C are designed, characterized and expected to meet specified
performance from –40°C to 85°C but are not tested or QA sampled at
these temperatures. The LTC6246I/LTC6247I/LTC6248I are guaranteed
to meet specified performance from –40°C to 85°C. The LTC6246H/
LTC6247H/LTC6248H are guaranteed to meet specified performance from
–40°C to 125°C.
Note 13: FPBW is determined from distortion performance in a gain of +2
configuration with HD2, HD3 < –40dBc as the criteria for a valid output.
Note 14: Differential gain and phase are measured using a Tektronix
TSG120YC/NTSC signal generator and a Tektronix 1780R video
measurement set.
Typical perForMance characTerisTics
VOS Distribution, VCM = VS/2
(MS, PNP Stage)
VOS Distribution, VCM = VS/2
(TSOT-23, PNP Stage)
VOS Distribution, VCM = V+ – 0.5V
(MS, NPN Stage)
22
20
18
16
14
12
10
8
16
14
12
10
8
25
20
15
10
5
V
V
= 5V, 0V
= 4.5V
V
V
= 5V, 0V
= 2.5V
V
V
= 5V, 0V
S
= 2.5V
CM
S
CM
S
CM
6
6
4
4
2
2
0
0
0
–2000 –1200
–400
400
1200
2000
–375 –250 –150 –50 50 150 250 350
–175 –125 –75 –25 25
75 125 175
INPUT OFFSET VOLTAGE (µV)
INPUT OFFSET VOLTAGE (µV)
INPUT OFFSET VOLTAGE (µV)
624678 G03
624678 G01
624678 G02
624678fa
ꢆ
LTC6246/LTC6247/LTC6248
Typical perForMance characTerisTics
VOS Distribution, VCM = V+ – 0.5V
(TSOT-23, NPN Stage)
VOS vs Temperature
(MS10, PNP Stage)
VOS vs Temperature
(MS10, NPN Stage)
18
16
14
12
10
8
500
400
300
200
100
0
2500
2000
1500
1000
500
V
V
= 5V, 0V
= 4.5V
V
V
= 5V, 0V
= 2.5V
V
V
= 5V, 0V
S
= 4.5V
CM
S
CM
S
CM
6 DEVICES
6 DEVICES
0
–500
–1000
–1500
–2000
–2500
6
–100
–200
–300
–400
4
2
0
–2000 –1200
–400
400
1200
2000
–55 –35 –15
5
25 45 65 85 105 125
–55 –35 –15
5
25 45 65 85 105 125
INPUT OFFSET VOLTAGE (µV)
TEMPERATURE (°C)
TEMPERATURE (°C)
624678 G04
624678 G05
624678 G06
V
OS vs Temperature
Offset Voltage
vs Input Common Mode Voltage
V
OS vs Temperature
(MS10, PNP Stage)
(MS10, NPN Stage)
2500
2000
1500
1000
500
500
400
1200
1000
800
600
400
200
0
V
S
= 5V, 0V
V
V
= 2.7V, 0V
= 1.35V
S
CM
6 DEVICES
300
200
100
–55°C
25°C
0
0
–100
–200
–300
–400
–500
–500
–1000
–1500
–2000
125°C
V
V
= 2.7V, 0V
CM
6 DEVICES
S
= 2.2V
–55 –35 –15
5
25 45 65 85 105 125
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
–55 –35 –15
5
25 45 65 85 105 125
TEMPERATURE (°C)
INPUT COMMON MODE VOLTAGE (V)
TEMPERATURE (°C)
624678 G08
624678 G09
624678 G07
Input Bias Current
Offset Voltage vs Output Current
Warm-Up Drift vs Time
vs Common Mode Voltage
5
0
800
600
2.0
1.5
V
=
2ꢀ5V
V
S
=
2.5V
V
S
= 5V, 0V
S
A
125°C
T
= 25°C
400
25°C
125°C
–5
200
1.0
0
–10
–15
–20
–25
–30
–35
0.5
–200
–400
–600
–800
–1000
–1200
–1400
–1600
–55°C
0
–55°C
–0.5
–1.0
–1.5
–2.0
25°C
0
20 40 60 80 100 120 140 160
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
–100 –75 –50 –25
0
25 50 75 100
TIME AFTER POWER-UP (s)
COMMON MODE VOLTAGE (V)
OUTPUT CURRENT (mA)
624678 G11
624678 G12
624678 G10
624678fa
ꢇ
LTC6246/LTC6247/LTC6248
Typical perForMance characTerisTics
Input Noise Voltage and Noise
Current vs Frequency
Input Bias Current vs Temperature
0.1Hz to 10Hz Voltage Noise
700
600
500
400
300
200
100
0
1.5
1.0
0.5
0
1000
100
10
V
S
= 5V, 0V
V
= ±±.5V
S
e , V = 4.5V
V
= 4.5V
n
CM
CM
e , V = 2.5V
n
CM
0.5
–1.0
–1.5
i , V = 2.5V
n
CM
V
CM
= 2.5V
1.0
i , V = 4.5V
n
CM
–100
–200
0.1
–55
–25
5
35
65
95
125
0
1
±
3
4
5
6
7
8
9
10
1
10 100 1k 10k 100k 1M 10M
TEMPERATURE (°C)
TIME (1s/DIV)
FREQUENCY (Hz)
624678 G13
6±4678 G14
624678 G15
SHDN Pin Current
Supply Current
vs Supply Voltage (Per Amplifier)
Supply Current Per Amplifier
vs SHDN Pin Voltage
vs SHDN Pin Voltage
1.20
1.00
0.80
0.60
0.40
0.20
0
1.25
1.00
0.75
0.50
0.25
0
0.25
0
V
S
= 5V, 0V
V = 5V, 0V
S
125°C
–55°C
SHUTDOWN CURRENT
25°C
–0.25
–0.50
–0.75
–1.00
–1.25
–1.50
–1.75
–2.00
–2.25
–2.50
T
= 125°C
A
–55°C
T
= –55°C
A
T
= 25°C
25°C
2
A
125°C
0
1
2
3
4
5
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
0
0.5
1
1.5
2.5
3
3.5
4
4.5
5
TOTAL SUPPLY VOLTAGE (V)
SHDN PIN VOLTAGE (V)
SHDN PIN VOLTAGE (V)
624678 G16
624678 G17
624678 G18
Output Saturation Voltage
vs Load Current (Output High)
Minimum Supply Voltage,
VCM = VS/2 (PNP Operation)
Minimum Supply Voltage,
VCM = V+ – 0.5V (NPN Operation)
12
10
8
5
4
10
1
V
= 2.ꢀV
V
= V – 0.5V
CC
S
CM
3
–55°C
T
= 12ꢀ°C
A
6
T
= 2ꢀ°C
A
2
4
25°C
1
0.1
0.01
125°C
2
125°C
T
= –ꢀꢀ°C
1
A
0
0
–55°C
4
25°C
3.5
–2
–1
2
2.5
3
3.5
4
4.5
5
5.5
2
2.5
3
4.5
5
5.5
0.01
0.1
10
100
TOTAL SUPPLY VOLTAGE (V)
TOTAL SUPPLY VOLTAGE (V)
LOAD CURRENT (mA)
624678 G19
624678 G20
624678 G21
624678fa
ꢈ
LTC6246/LTC6247/LTC6248
Typical perForMance characTerisTics
Output Saturation Voltage
Output Short-Circuit Current
vs Power Supply Voltage
vs Load Current (Output Low)
Open Loop Gain
500
400
10
1
120
100
80
V
= 2.ꢀV
T
= 25°C
T
= –55°C
A
A
S
S
V
= 5V, 0V
SINK
T
T
= 25°C
A
300
60
R
= 100 TO MID SUPPLY
L
= 125°C
200
A
40
R
= 1k TO MID SUPPLY
L
100
20
0
T
= 12ꢀ°C
A
0
–100
–200
–300
–400
–500
–20
–40
–60
–80
–100
T
= 2ꢀ°C
A
0.1
R
L
= 1k TO GROUND
T
= 125°C
A
R
L
= 100 TO GROUND
SOURCE
T
= –ꢀꢀ°C
A
T
= –55°C
A
T
= 25°C
A
0.01
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
0.01
0.1
1
10
100
1.25 1.45 1.65 1.85 2.05 2.25 2.45 2.65
OUTPUT VOLTAGE (V)
LOAD CURRENT (mA)
POWER SUPPLY VOLTAGE ( Vꢀ
624678 G24
624678 G22
624678 G23
Open Loop Gain
Gain vs Frequency (AV = 2)
Gain vs Frequency (AV = 1)
6
12
6
1000
900
800
700
600
500
400
300
200
100
0
T
= 25°C
A
S
V
= 2.7V, 0V
R
= 100 TO MID SUPPLY
L
0
–6
R
L
= 1k TO MID SUPPLY
0
R
L
= 1k TO GROUND
–12
–18
–24
–6
–12
–18
V
=
2.ꢀV
S
A
F
R
= 100 TO GROUND
L
V
=
2.ꢀV
T
= 2ꢀ°C
S
A
L
–100
–200
–300
T
= 2ꢀ°C
= 1k
R = R = 1k
R
G
R
= 1k
L
0.01
0.1
1
10
100
0.01
0.1
1
10
100
0
0.5
1
1.5
2
2.5 2.7
FREQUENCY (MHz)
FREQUENCY (MHz)
OUTPUT VOLTAGE (V)
624678 G26
624678 G27
624678 G25
Gain Bandwidth and Phase
Margin vs Supply Voltage
Gain Bandwidth and Phase
Margin vs Temperature
Open Loop Gain and Phase
vs Frequency
80
70
60
50
40
30
20
10
0
150
100
50
70
70
60
50
40
T
= 25°C
= 1k
A
L
T
= 25°C
R = 1k
L
T
= 25°C
= 1k
A
A
L
R
60
50
R
PHASE MARGIN
V
S
= 2ꢀ5V
PHASE
V
=
=
S
2ꢀ5V
PHASE MARGIN
300
250
200
150
100
V
S
1ꢀ35V
GAIN
V
= 1ꢀ35V
S
200
180
160
140
120
100
GAIN BANDWIDTH PRODUCT
V
S
=
2ꢀ5V
1ꢀ35V
0
GAIN BANDWIDTH PRODUCT
2ꢀ5V
V
=
S
V
=
S
–50
–100
–10
–20
V
S
= 1ꢀ35V
100k
1M
10M
FREQUENCY (Hz)
100M 300M
2.5
4
5
3
3.5
4.5
–55 –35 –15
5
25 45 65 85 105 125
TOTAL SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
624678 G28
624678 G29
624678 G30
624678fa
ꢀ0
LTC6246/LTC6247/LTC6248
Typical perForMance characTerisTics
Common Mode Rejection Ratio
vs Frequency
Power Supply Rejection Ratio
vs Frequency
Output Impedance vs Frequency
1000
100
10
110
100
90
80
70
60
50
40
30
20
10
0
80
70
60
50
40
30
20
10
0
V
=
2.ꢀV
T = 25°C
A
V
T
=
2ꢀ5V
S
S
A
V
= 2ꢀ5V
= 25°C
S
A
= 10
V
NEGATIVE SUPPLY
A
= 2
V
POSITIVE SUPPLY
1
A
= 1
V
0.1
0.01
0.001
–10
–10
100k
1M
10M
FREQUENCY (Hz)
100M
1G
10 100 1k 10k 100k 1M 10M 100M 1G
10 100 1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
FREQUENCY (Hz)
624678 G31
624678 G31
624678 G33
Series Output Resistor
vs Capacitive Load (AV = 1)
Series Output Resistor
vs Capacitive Load (AV = 2)
Slew Rate vs Temperature
140
1±0
100
80
80
70
60
50
40
30
20
10
0
80
70
60
50
40
30
20
10
0
A
= –1, R = 1k, V
= 4V (±±25V),
V
V
A
=
OUT
= 1
2ꢀ5V
V
L
OUT P-P
500Ω
500Ω
S
A
= 1
V
±V (±12.5V) SLEW RATE MEASURED
P-P
–
= 100mV
P-P
R
S
V
OUT
–
AT MIDDLE ±/. OF OUTPUT
R
S
V
IN
+
V
V
OUT
+
FALLING, V = ±±25V
S
V
IN
C
L
R
S
= 10Ω
A
V
= 2
C
L
R
= 10Ω
S
RISING, V = ±±25V
S
R = 20Ω
S
R
= 20Ω
S
FALLING, V = ±12.5V
S
R
= 49ꢀ9Ω
S
V
OUT
=
2ꢀ5V
=200mV
RISING, V = ±12.5V
S
60
S
V
P-P
R
= 49ꢀ9Ω
R = R = 500Ω,
S
F
V
G
A
= 2
40
–55 –.5 –15
5
±5 45 65 85 105 1±5
10
100
1000
10000
10
100
1000
10000
TEMPERATURE (°C)
CAPACITIVE LOAD (pF)
CAPACITIVE LOAD (pF)
6±4678 G.4
624678 G35
624678 G36
Distortion vs Frequency
(AV = 1, 5V)
Distortion vs Frequency
(AV = 1, 2.7V)
Distortion vs Frequency
(AV = 2, 5V)
–40
–50
–40
–50
–40
–50
V
V
A
=
OUT
= 1
2.5V
= 2V
V
V
A
=
OUT
= 1
1.35V
= 1V
V
V
A
=
S
OUT
= 2
V
2.5V
= 2V
S
S
R
= 100Ω, 3RD
R
= 100Ω, 3RD
L
L
P-P
P-P
P-P
V
V
–60
–60
–60
R
= 100Ω, 3RD
L
R
L
= 100Ω, 2ND
R
L
= 100Ω, 2ND
–70
–70
–70
R
= 100Ω, 2ND
L
R
L
= 1kΩ, 2ND
–80
–80
–80
R
L
= 1kΩ, 3RD
–90
–90
–90
R
L
= 1kΩ, 3RD
R
L
= 1kΩ, 3RD
–100
–110
–120
–100
–110
–120
–100
–110
–120
R
L
= 1kΩ, 2ND
1
R
L
= 1kΩ, 2ND
1
0.01
0.1
10
0.01
0.1
1
10
0.01
0.1
10
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
624678 G37
624678 G38
624678 G39
624678fa
ꢀꢀ
LTC6246/LTC6247/LTC6248
Typical perForMance characTerisTics
Distortion vs Frequency
AV = 2, 2.7V)
Maximum Undistorted Output
Signal vs Frequency
Settling Time vs Output Step
(Noninverting)
–40
–50
5
4
3
2
1
0
200
180
160
140
120
100
80
V
A
=
2ꢀ.V
S
V
A
R
L
= 100Ω, ꢀRD
= 1
–
+
T
= 2.°C
V
OUT
V
IN
R
L
= 100Ω, 2ND
–60
1k
–70
R
= 1kΩ, 2ND
L
–80
1mV
1mV
R
L
= 1kΩ, ꢀRD
–90
V
= 2.5V
= 25°C
= 1kΩ
S
A
L
T
60
–100
–110
–120
R
40
10mV
10mV
HD2, HD3 < –40dBc
V
V
A
=
OUT
= 2
1.ꢀ5V
= 1V
S
A
= 2
= –1
P-P
V
V
20
A
V
0
0.01
0.1
1
10
–4 –3 –2 –1
0
1
2
3
4
0.01
0.1
1
10
FREQUENCY (MHz)
OUTPUT STEP (V)
FREQUENCY (MHz)
624678 G40
624678 G42
624678 G41
Settling Time vs Output Step
(Inverting)
SHDN Pin Response Time
Large Signal Response
200
180
160
140
120
100
80
V
A
T
= 2ꢀ.V
1k
S
V
A
= –1
1k
= 2.°C
–
V
IN
V
OUT
+
0V
1k
V
SHDN
±.ꢀV/DIV
0V
1mV
10mV
1mV
1V/DIV
0V
OUT
1.6V/DIV
60
V
40
10mV
6±4678 G44
6±4678 G4.
10µs/DIV
±00ns/DIV
20
A
V
= 1
A
V
= 1
= ±±2.V
= 1k
V
S
L
V
S
= ±±.ꢀV
= 1k
0
R
R
–4 –3 –2 –1
0
1
2
3
4
L
V
= 1.6V
IN
OUTPUT STEP (V)
624678 G43
Small Signal Response
Output Overdriven Recovery
0V
V
IN
0V
1V/DIV
25mV/DIV
0V
V
OUT
2V/DIV
624678 G46
624678 G47
50ns/DIV
100ns/DIV
A
V
= 1
=
A
V
=
=
= 1k
= 3V
2
V
S
L
V
S
L
2ꢀ5V
2ꢀ.V
R
= 1k
R
V
IN
P-P
624678fa
ꢀꢁ
LTC6246/LTC6247/LTC6248
pin FuncTions
–
–
–IN: Inverting Input of Amplifier. Valid input range from V
V :NegativeSupplyVoltage.Typically0V.Thiscanbemade
+
+
–
to V .
a negative voltage as long as 2.5V ≤ (V – V ) ≤ 5.25V.
+IN: Non-Inverting Input of Amplifier. Valid input range
SHDN: Active Low Shutdown. Threshold is typically 1.1V
–
+
–
from V to V .
referenced to V . Floating this pin will turn the part on.
+
V : Positive Supply Voltage. Allowed applied voltage
OUT:AmplifierOutput.Swingsrail-to-railandcantypically
source/sink over 50mA of current at a total supply of 5V.
–
ranges from 2.5V to 5.25V when V = 0V.
applicaTions inForMaTion
Circuit Description
and the PNP pair becomes inactive for the remaining input
commonmoderange.Also,attheinputstage,devicesQ17
to Q19 act to cancel the bias current of the PNP input pair.
When Q1/Q2 are active, the current in Q16 is controlled to
be the same as the current in Q1 and Q2. Thus, the base
current of Q16 is nominally equal to the base current of
theinputdevices.ThebasecurrentofQ16isthenmirrored
by devices Q17 to Q19 to cancel the base current of the
input devices Q1/Q2. A pair of complementary common
emitter stages, Q14/Q15, enable the output to swing from
rail-to-rail.
The LTC6246/LTC6247/LTC6248 have an input and output
signal range that extends from the negative power supply
to the positive power supply. Figure 1 depicts a simplified
schematic of the amplifier. The input stage is comprised
of two differential amplifiers, a PNP stage, Q1/Q2, and an
NPN stage, Q3/Q4 that are active over different common
mode input voltages. The PNP stage is active between
the negative supply to nominally 1.2V below the positive
supply. As the input voltage approaches the positive sup-
ply, the transistor Q5 will steer the tail current, I , to the
1
current mirror, Q6/Q7, activating the NPN differential pair
+
V
R3
R4
R5
+
–
V
V
ESDD1
ESDD2
+
+
Q12
I
I
1
2
Q15
Q13
Q11
+IN
–IN
C2
+
D6
D5
D8
D7
V
BIAS
Q5
I
3
ESDD5
OUT
C
–
C
V
Q4 Q3
Q1 Q2
ESDD3
ESDD4
Q18
BUFFER
AND
OUTPUT BIAS
Q10
ESDD6
+
Q9
–
V
V
Q8
Q16
Q17
C1
Q19
Q6
Q7
Q14
R1
R2
–
V
624678 F01
Figure 1. LTC6246/LTC6247/LTC6248 Simplified Schematic Diagram
624678fa
ꢀꢂ
LTC6246/LTC6247/LTC6248
applicaTions inForMaTion
Input Offset Voltage
Input Protection
The offset voltage will change depending upon which
input stage is active. The PNP input stage is active from
the negative supply rail to approximately 1.2V below the
positive supply rail, then the NPN input stage is activated
for the remaining input range up to the positive supply rail
with the PNP stage inactive. The offset voltage magnitude
for the PNP input stage is trimmed to less than 500µV with
5V total supply at room temperature, and is typically less
than 150μV. The offset voltage for the NPN input stage
is typically less than 1.7mV with 5V total supply at room
temperature.
The input stages are protected against a large differential
input voltage of 1.4V or higher by 2 pairs of back-to-back
diodes to prevent the emitter-base breakdown of the input
transistors. In addition, the input and shutdown pins have
reverse biased diodes connected to the supplies. The cur-
rent in these diodes must be limited to less than 10mA.
The amplifiers should not be used as comparators or in
other open loop applications.
ESD
The LTC6246 family has reverse-biased ESD protection
diodes on all inputs and outputs as shown in Figure 1.
Input Bias Current
Thereisanadditionalclampbetweenthepositiveandnega-
tive supplies that further protects the device during ESD
strikes. Hot plugging of the device into a powered socket
must be avoided since this can trigger the clamp resulting
in larger currents flowing between the supply pins.
The LTC6246 family uses a bias current cancellation cir-
cuit to compensate for the base current of the PNP input
pair. When the input common mode voltage is less than
200mV, the bias cancellation circuit is no longer effective
and the input bias current magnitude can reach a value
above 1µA. For common mode voltages ranging from
0.2V above the negative supply to 1.2V below the positive
supply, the low input bias current of the LTC6246 family
allows the amplifiers to be used in applications with high
source resistances where errors due to voltage drops
must be minimized.
Capacitive Loads
The LTC6246/LTC6247/LTC6248 are optimized for high
bandwidthandlowpowerapplications.Consequentlythey
have not been designed to directly drive large capacitive
loads. Increased capacitance at the output creates an ad-
ditional pole in the open loop frequency response, wors-
ening the phase margin. When driving capacitive loads, a
resistorof10Ω to 100Ωshould beconnected between the
amplifier output and the capacitive load to avoid ringing
or oscillation. The feedback should be taken directly from
the amplifier output. Higher voltage gain configurations
tend to have better capacitive drive capability than lower
gain configurations due to lower closed loop bandwidth
and hence higher phase margin. The graphs titled Series
Output Resistor vs Capacitive Load demonstrate the tran-
sient response of the amplifier when driving capacitive
loads with various series resistors.
Output
The LTC6246 family has excellent output drive capability.
The amplifiers can typically deliver over 50mA of output
drive current at a total supply of 5V. The maximum out-
put current is a function of the total supply voltage. As
the supply voltage to the amplifier decreases, the output
current capability also decreases. Attention must be paid
to keep the junction temperature of the IC below 150°C
(refer to the Power Dissipation Section) when the output
is in continuous short circuit. The output of the amplifier
has reverse-biased diodes connected to each supply. If
the output is forced beyond either supply, extremely high
current will flow through these diodes which can result
in damage to the device. Forcing the output to even 1V
beyond either supply could result in several hundred mil-
liamps of current through either diode.
624678fa
ꢀꢃ
LTC6246/LTC6247/LTC6248
applicaTions inForMaTion
Feedback Components
Power Dissipation
When feedback resistors are used to set up gain, care
must be taken to ensure that the pole formed by the
feedback resistors and the parasitic capacitance at the
inverting input does not degrade stability. For example if
the amplifier is set up in a gain of +2 configuration with
gain and feedback resistors of 5k, a parasitic capacitance
of 5pF (device + PC board) at the amplifier’s inverting
input will cause the part to oscillate, due to a pole formed
at 12.7MHz. An additional capacitor of 5pF across the
feedback resistor as shown in Figure 2 will eliminate any
ringing or oscillation. In general, if the resistive feedback
network results in a pole whose frequency lies within the
closed loop bandwidth of the amplifier, a capacitor can be
added in parallel with the feedback resistor to introduce
a zero whose frequency is close to the frequency of the
pole, improving stability.
The LTC6246 and LTC6247 contain one and two amplifiers
respectively. Hence the maximum on-chip power dis-
sipation for them will be less than the maximum on-chip
power dissipation for the LTC6248, which contains four
amplifiers.
TheLTC6248ishousedinasmall16-leadMSpackageand
typically has a thermal resistance (θ ) of 125°C/ W. It is
JA
necessary to ensure that the die’s junction temperature
does not exceed 150°C. The junction temperature, T , is
J
calculated from the ambient temperature, T , power dis-
A
sipation, PD, and thermal resistance, θ :
JA
T = T + (P • θ )
J
A
D
JA
The power dissipation in the IC is a function of the supply
voltage, output voltage and load resistance. For a given
supplyvoltagewithoutputconnectedtogroundorsupply,
the worst-case power dissipation P
occurs when
D(MAX)
5pF
the supply current is maximum and the output voltage at
half of either supply voltage for a given load resistance.
5k
P
is approximately (since I actually changes with
D(MAX)
S
–
output load current) given by:
V
OUT
C
PAR
V
2
S 2
+
PD(MAX) =(VS •IS(MAX))+
/RL
5k
V
IN
624678 F02
Example:ForanLTC6248ina16-leadMSpackageoperating
on 2.5V supplies and driving a 100Ω load to ground, the
worst-case power dissipation is approximately given by
Figure 2. 5pF Feedback Cancels Parasitic Pole
Shutdown
2
P
/Amp = (5 • 1.3mA) + (1.25) /100 = 22mW
D(MAX)
The LTC6246 and LTC6247MS have SHDN pins that can
shut down the amplifier to 42µA typical supply current.
The SHDN pin needs to be taken below 0.8V above the
negative supply for the amplifier to shut down. When left
floating,theSHDNpinisinternallypulleduptothepositive
supply and the amplifier remains on.
If all four amplifiers are loaded simultaneously then the
total power dissipation is 88mW.
AttheAbsoluteMaximumambientoperatingtemperature,
the junction temperature under these conditions will be:
T = T + P • 125°C/W
J
A
D
= 125 + (0.088W • 125°C/W) = 136°C
which is less than the absolute maximum junction tem-
perature for the LTC6248 (150°C).
Refer to the Pin Configuration section for thermal resis-
tances of various packages.
624678fa
ꢀꢄ
LTC6246/LTC6247/LTC6248
Typical applicaTions
12-Bit ADC Driver
Low Noise Low Power DC-Accurate Single Supply
Photodiode Amplifier
Figure3showstheLTC6246drivinganLTC236612-bitA/D
converter. The low wideband noise of the LTC6246 main-
tains a 70dB SNR even without the use of an intermediate
antialiasing RC filter. On a single 3.3V supply with a 2.5V
reference, a full –1dBFS output can be obtained without
the amplifier transitioning between input regions, thus
minimizing crossover distortion. Figure 4 shows an FFT
obtained with a sampling rate of 2.2Msps and a 350kHz
input waveform. Spurious free dynamic range is a quite
handsome 82dB.
Figure 5 shows the LTC6246 applied as a low power high
performance transimpedance amplifier for a photodiode.
A low noise JFET Q1 acts as a current buffer, with R2 and
R3 imposing a low frequency gain of approximately 1.
Transimpedance gain is set by feedback resistor R1 to
1MΩ. R4 and R5 set the LTC6246 inputs at 1V below
the 3V rail, with C3 reducing their noise contribution.
By feedback this 1V also appears across R2, setting the
JFET quiescent current at 1mA completely independent
of its pinchoff voltage and I
characteristics. It does
GS
DSS
3.3V 2.5V
this by placing the JFETs 1mA V at the gate referenced
3.3V
to the source, which is sitting 1V above ground. For this
JFET, that will typically be about 500mV, and this voltage
is imposed as a reverse voltage on the photodiode PD1.
V
DD
V
REF
CS
SDO
SCK
V
IN
+
A
IN
LTC6246
LTC2366
GND
–
At zero I photocurrent, the output sits at the same volt-
OV
DD
PD
499Ω
1%
age and rises as photocurrent increases. As mentioned
624678 F03
499Ω
1%
before, R2 and R3 set the JFET gain to 1 at low frequency.
10pF
R1
1M, 1%
C1
0.1pF
Figure 3. Single Supply 12-Bit ADC Driver
3V
R2
1k
3V
Q1
NXP
BF862
+
0
I
PD
V
= V + I • 1M
f
f
= 350.195kHz
SAMP
LTC6246
OUT
R
PD
IN
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
= 2.2Msps
–
SFDR = 82dB
SNR = 70dB
1024 POINT FFT
PD1
OSRAM
SFH213
C2
R3
1k
6.8nF
FILM
OR NPO
C3
0.1µF
R4
10k
R5
20k
3V
R6
10M
3V
R7
1k
+
–
V
LT6003
R
0
200
400
600
800
1000
FREQUENCY (kHz)
C4
1µF
624678 F04
624678 F05
Figure 4. 350kHz FFT Showing 82dB SFDR
–3dB BW = 700kHz
= 2.2mA
I
CC
OUTPUT NOISE = 160µV
MEASURED ON A 1MHz BW
RMS
V
OUT
IS REFERRED TO V
R
AT ZERO PHOTOCURRENT, V
= V
R
OUT
Figure 5. Low Noise Low Power DC Accurate
Single Supply Photodiode Amplifier
624678fa
ꢀꢅ
LTC6246/LTC6247/LTC6248
Typical applicaTions
Thisisnotthelowestnoiseconfigurationforatransistor,as
downstream noise sources appear at the input completely
unattenuated. At low frequency, this is not a concern for a
transimpedance amplifier because the noise gain is 1 and
theoutputnoiseisdominatedbythe130nV/√Hzofthe1MΩ
R1. However, at increasing frequencies the capacitance
of the photodiode comes into play and the circuit noise
gain rises as the 1MΩ feedback looks back into lower and
lower impedance. But capacitor C2 comes to the rescue.
In addition to the obvious quenching of noise source R3,
capacitor C2 increases the JFET gain to about 30 at high
frequency effectively attenuating the downstream noise
contributions of R2 and the op amp input noise. Thus the
circuit achieves low input voltage noise at high frequency
where it is most needed. Amplifier LT6003 is used to
buffer the output voltage of the photodiode and R7 and
C4 are used to filter out the voltage noise of the LT6003.
Bandwidth to 700kHz was achieved with this circuit, with
60dB 5.5MHz Gain Block
Figure 6 shows the LTC6247 configured as a low power
high gain high bandwidth block. Two amplifiers each
configured with a gain of 31V/V, are cascaded in series. A
660nF capacitor is used to limit the DC gain of the block
to around 30dB to minimize output offset voltage. Figure 7
shows the frequency response of the block. Mid-band
voltage gain is approximately 60dB with a –3dB frequency
of 5.5MHz, thus resulting in a gain-bandwidth product of
5.5GHz with only 1.9mA of quiescent supply current.
Single 2.7V Supply 4MHz 4th Order Butterworth Filter
Benefitting from low voltage operation and rail-to-rail
output, a low power filter that is suitable for antialiasing
can be built as shown in Figure 8. On a 2.7V supply the
filter has a passband of approximately 4MHz with 2V
P-P
inputsignalandastopbandattenuationthatisgreaterthan
–75dB at 43MHz as shown in Figure 9. The resistor and
capacitor values can be scaled to reduce noise at the cost
of large signal power consumption and distortion.
integratedoutputnoisebeing160µV
upto1MHz.Total
RMS
supply current was a very low 2.2mA.
65
60
55
50
45
40
1.5k
2.5V
30k
2.5V
50Ω
V
1k
–
–
1/2LTC6247
660nF
1/2LTC6247
V
OUT
+
+
V
V
= 2ꢀ5V
S
35
30
25
20
IN
= 4ꢀ5mV
IN
= 1kΩ
P-P
–2.5V
–2.5V
R
L
624678 F06
DC GAIN = 30dB
(DUE TO 660nF DC BLOCKING CAP)
OUTPUT OFFSET = 4mV
Figure 6. 60dB 5.5MHz Gain Block
10k
100k
1M
10M
FREQUENCY (kHz)
624678 F07
Figure 7
10
0
910Ω
1.1k
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
12pF
5.6pF
2.7k
910Ω
2.7V
–
V
IN
1.1k
2.3k
2.7V
–
56pF
1/2LTC6247
+
120pF
1/2LTC6247
V
OUT
+
624678 F08
1.2V
V
V
= 2.7V, 0V
S
= 2V
IN P-P
= 1kΩ to 0V
R
L
Figure 8. Single 2.7V Supply 4MHz
4th Order Butterworth Filter
10k
100k
1M
10M
100M
FREQUENCY (kHz)
624678 F09
Figure 9
624678fa
ꢀꢆ
LTC6246/LTC6247/LTC6248
package DescripTion
KC Package
8-Lead Plastic UTDFN (2mm × 2mm)
(Reference LTC DWG # 05-08-1749 Rev Ø)
1.37 p 0.10
R = 0.115
TYP
1.37 p0.05
2.00 p0.10
5
8
R = 0.05
0.70 p0.05
TYP
0.40 p 0.10
PIN 1 NOTCH
2.55 p0.05
1.15 p0.05
2.00 p0.10
0.64 p 0.10
0.64 p0.05
R = 0.20 OR
0.25 s 45o
CHAMFER
PIN 1 BAR
TOP MARK
(SEE NOTE 6)
PACKAGE
OUTLINE
(KC8) UTDFN 0107 REVØ
4
1
0.25 p 0.05
0.45 BSC
0.23 p 0.05
0.45 BSC
0.55 p0.05
0.125 REF
1.35 REF
1.35 REF
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
BOTTOM VIEW—EXPOSED PAD
0.00 – 0.05
NOTE:
1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660 Rev F)
3.00 p 0.102
(.118 p .004)
(NOTE 3)
0.52
(.0205)
REF
0.889 p 0.127
(.035 p .005)
8
7 6 5
3.00 p 0.102
(.118 p .004)
(NOTE 4)
5.23
(.206)
MIN
4.90 p 0.152
(.193 p .006)
3.20 – 3.45
(.126 – .136)
DETAIL “A”
0o – 6o TYP
0.254
(.010)
GAUGE PLANE
0.65
(.0256)
BSC
0.42 p 0.038
1
2
3
4
(.0165 p .0015)
0.53 p 0.152
(.021 p .006)
TYP
1.10
(.043)
MAX
0.86
(.034)
REF
RECOMMENDED SOLDER PAD LAYOUT
DETAIL “A”
0.18
(.007)
SEATING
PLANE
0.22 – 0.38
0.1016 p 0.0508
(.009 – .015)
(.004 p .002)
0.65
(.0256)
BSC
TYP
MSOP (MS8) 0307 REV F
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
624678fa
ꢀꢇ
LTC6246/LTC6247/LTC6248
package DescripTion
MS Package
10-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1661 Rev E)
0.889 ± 0.127
(.035 ± .005)
5.23
(.206)
MIN
3.20 – 3.45
(.126 – .136)
3.00 ± 0.102
(.118 ± .004)
(NOTE 3)
0.497 ± 0.076
(.0196 ± .003)
REF
0.50
0.305 ± 0.038
(.0120 ± .0015)
TYP
(.0197)
10 9
8
7 6
BSC
RECOMMENDED SOLDER PAD LAYOUT
3.00 ± 0.102
(.118 ± .004)
(NOTE 4)
4.90 ± 0.152
(.193 ± .006)
DETAIL “A”
0° – 6° TYP
0.254
(.010)
GAUGE PLANE
1
2
3
4 5
0.53 ± 0.152
(.021 ± .006)
0.86
(.034)
REF
1.10
(.043)
MAX
DETAIL “A”
0.18
(.007)
SEATING
PLANE
0.17 – 0.27
(.007 – .011)
TYP
0.1016 ± 0.0508
(.004 ± .002)
0.50
(.0197)
BSC
MSOP (MS) 0307 REV E
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
624678fa
ꢀꢈ
LTC6246/LTC6247/LTC6248
package DescripTion
MS Package
16-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1669 Rev Ø)
0.889 p 0.127
(.035 p .005)
5.23
(.206)
MIN
3.20 – 3.45
(.126 – .136)
4.039 p 0.102
(.159 p .004)
(NOTE 3)
0.50
(.0197)
BSC
0.305 p 0.038
(.0120 p .0015)
0.280 p 0.076
(.011 p .003)
REF
TYP
16151413121110
9
RECOMMENDED SOLDER PAD LAYOUT
3.00 p 0.102
(.118 p .004)
(NOTE 4)
DETAIL “A”
0.254
4.90 p 0.152
(.193 p .006)
(.010)
0o – 6o TYP
GAUGE PLANE
0.53 p 0.152
(.021 p .006)
1 2 3 4 5 6 7 8
0.86
(.034)
REF
1.10
(.043)
MAX
DETAIL “A”
0.18
(.007)
SEATING
PLANE
0.17 – 0.27
(.007 – .011)
TYP
0.1016 p 0.0508
(.004 p .002)
MSOP (MS16) 1107 REV Ø
0.50
(.0197)
BSC
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
624678fa
ꢁ0
LTC6246/LTC6247/LTC6248
package DescripTion
S6 Package
6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
2.90 BSC
(NOTE 4)
0.62
MAX
0.95
REF
1.22 REF
1.4 MIN
1.50 – 1.75
2.80 BSC
3.85 MAX 2.62 REF
(NOTE 4)
PIN ONE ID
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.30 – 0.45
6 PLCS (NOTE 3)
0.95 BSC
0.80 – 0.90
0.20 BSC
DATUM ‘A’
0.01 – 0.10
1.00 MAX
0.30 – 0.50 REF
1.90 BSC
0.09 – 0.20
(NOTE 3)
S6 TSOT-23 0302 REV B
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
624678fa
ꢁꢀ
LTC6246/LTC6247/LTC6248
package DescripTion
TS8 Package
8-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1637)
2.90 BSC
(NOTE 4)
0.52
MAX
0.65
REF
1.22 REF
1.50 – 1.75
(NOTE 4)
2.80 BSC
1.4 MIN
3.85 MAX 2.62 REF
PIN ONE ID
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.22 – 0.36
8 PLCS (NOTE 3)
0.65 BSC
0.80 – 0.90
0.20 BSC
DATUM ‘A’
0.01 – 0.10
1.00 MAX
0.30 – 0.50 REF
1.95 BSC
0.09 – 0.20
(NOTE 3)
TS8 TSOT-23 0802
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
624678fa
ꢁꢁ
LTC6246/LTC6247/LTC6248
revision hisTory
REV
DATE
DESCRIPTION
PAGE NUMBER
A
2/10
Changes to Graph G15
9
624678fa
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
ꢁꢂ
LTC6246/LTC6247/LTC6248
Typical applicaTion
700kHz, 1MΩ Single Supply Photodiode Amplifier
Output Noise Spectrum
Transient Response
R1
1M, 1%
200
5V/DIV
LED DRIVER
VOLTAGE
C1
0.1pF
3V
R2
1k
20nV/√Hz/DIV
3V
500mV/DIV
OUTPUT
+
I
Q1
NXP
BF862
PD
LTC6246
V
≈ 0.5V + I • 1M
PD
OUT
WAVEFORM
0V
–
C2
PD1
OSRAM
SFH213
–3dB BW = 700kHz
= 2.2mA
OUTPUT NOISE = 153µV
RMS
MEASURED ON A 1MHz BW
6.8nF
FILM
OR NPO
R3
1k
0
624678 TA02c
I
CC
500ns/DIV
C3
0.1µF
10kHz
100kHz
1MHz
624678 TA02b
R4
10k
R5
20k
3V
624678 TA02a
relaTeD parTs
PART NUMBER DESCRIPTION
Operational Amplifiers
COMMENTS
LT1818/LT1819 Single/Dual Wide Bandwidth, High Slew Rate Low Noise and
Distortion Op Amps
400MHz, 9mA, 6nV/√Hz, 2500V/µs, 1.5mV –85dBc at 5MHz
LT1806/LT1807 Single/Dual Low Noise Rail-to-Rail Input and Output Op Amps 325MHz, 13mA, 3.5nV/√Hz, 140V/µs, 550µV, 85mA Output Drive
LT6230/LT6231/ Single/Dual/Quad Low Noise Rail-to-Rail Output Op Amps
LT6232
215MHz, 3.5mA, 1.1nV/√Hz, 70V/µs, 350µV
LT6200/LT6201 Single/Dual Ultralow Noise Rail-to-Rail Input/Output Op Amps 165MHz, 20mA, 0.95nV/√Hz, 44V/µs, 1mV
LT6202/LT6203/ Single/Dual/Quad Ultralow Noise Rail-to-Rail Op Amp
LT6204
100MHz, 3mA, 1.9nV/√Hz, 25V/µs, 0.5mV
LT1468
16-Bit Accurate Precision High Speed Op Amp
90MHz, 3.9mA, 5nV/√Hz, 22V/µs, 175µV,
–96.5dB THD at 10V , 100kHz
P-P
LT1803/LT1804/ Single/Dual/Quad Low Power High Speed Rail-to-Rail Input
LT1805 and Output Op Amps
85MHz, 3mA, 21nV√Hz, 100V/µs, 2mV
LT1801/LT1802 Dual/Quad Low Power High Speed Rail-to-Rail Input and
Output Op Amps
80MHz, 2mA, 8.5nV√Hz, 25V/µs, 350µV
LT6552
LT1028
Single Supply Rail-to-Rail Output Video Difference Amplifier
Ultralow Noise, Precision High Speed Op Amps
75MHz (–3dB), 13.5mA, 55.5nV/√Hz, 350V/µs, 20mV
75MHz, 9.5mA, 0.85nV/√Hz, 11V/µs, 40µV
60MHz, 1.2mA, 1.2nV/√Hz, 15V/µs, 0.5mV
LT6233/LT6234/ Single/Dual/Quad Low Noise Rail-to-Rail Output Op Amps
LT6235
LT6220/LT6221/ Single/Dual/Quad Low Power High Speed Rail-to-Rail Input
60MHz, 1mA, 10nV/√Hz, 20V/µs, 350µV
LT6222
and Output Op Amps
LT6244
Dual High Speed CMOS Op Amp
50MHz, 7.4mA, 8nV/√Hz, 35V/µs, 100µV, Input Bias Current = 1pA
45MHz, 4.3mA, 12nV/√Hz, 45V/µs, 1.35mV
LT1632/LT1633 Dual/Quad Rail-to-Rail Input and Output Precision Op Amps
LT1630/LT1631 Dual/Quad Rail-to-Rail Input and Output Op Amps
LT1358/LT1359 Dual/Quad Low Power High Speed Op Amps
ADC’s
30MHz, 3.5mA, 6nV/√Hz, 10V/µs, 525µV
25MHz, 2.5mA, 8nV/√Hz, 600V/µs, 800µV, Drives All Capacitive Loads
LTC2366
LTC2365
LTC1417
LTC1274
3Msps, 12-Bit ADC Serial I/O
72dB SNR, 7.8mW No Data Latency TSOT-23 Package
73dB SNR, 7.8mW No Data Latency TSOT-23 Package
Single 5V or 5V Supplies, 0V to 4.096V or 2.048V Input Range
1Msps, 12-Bit ADC Serial I/O
Low Power 14-Bit 400ksps ADC Parallel I/O
Low Power 12-Bit 400ksps ADC Parallel I/O
10mW Single 5V or 5V Supplies, 0V to 4.096V or 2.048V Input Range
624678fa
LT 0210 REV A • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
ꢁꢃ
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LINEAR TECHNOLOGY CORPORATION 2009
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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