LT6020IDD#TRPBF [Linear]
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| 型号： | LT6020IDD#TRPBF |
| 厂家： | 
Linear |
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LT6020/LT6020-1
Dual Micropower, 5V/µs
Precision Rail-to-Rail
Output Amplifier
FeaTures
DescripTion
n
Excellent Slew Rate to Power Ratio
TheLT®6020isalowpower,enhanced slewrate,precision
operational amplifier. The proprietary circuit topology of
this amplifier gives excellent slew rate at low quiescent
power dissipation without compromising precision or
settling time. In addition, unique input stage circuitry
allows the input impedance to remain high during input
voltage steps as large as 5V. The combination of preci-
sion specs along with fast settling makes this part ideal
for MUX applications.
n
Slew Rate: 5V/μs
n
Maximum Supply Current: 100μA/Amplifier
n
Maximum Offset Voltage: 30μV
n
Maximum Offset Voltage Drift: 0.5μV/°C
n
High Dynamic Input Impedance
n
Fast Recovery from Shutdown
n
Maximum Input Bias Current: 3nA
n
No Output Phase Inversion
n
Gain Bandwidth Product: 400kHz
The low quiescent current of the LT6020 along with its
ability to operate on supplies as low as 3V make it useful
in portable systems. The LT6020-1 features a shutdown
mode which reduces the typical supply current to 1.4μA.
n
Wide Specified Supply Range: 3V to 30V
n
Operating Temperature Range: –40°C to 125°C
n
DFN and MS8 Packages
Rail-to-Rail Outputs
n
The LT6020 is available in the small 8-lead DFN and 8-lead
MSOP packages. The LT6020-1 is available in a 10-lead
DFN package.
applicaTions
n
Precision Signal Processing
L, LT, LTC, LTM, Linear Technology, SmartMesh and the Linear logo are registered trademarks
and SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Patent Pending.
n
18-Bit DAC Amplifier
n
Multiplexed ADC Applications
Low Power Portable Systems
Low Power Wireless Sensor Networks
n
n
Typical applicaTion
16-Bit DAC with 10V Output Swing
LT1019-2.5
20V Output Step Response
CS
5V/DIV
5V/DIV
3.8V TO 5.5V
IN
OUT
DC DC
1µF
0.1µF
GND
0.1µF
V
OUT
10pF
V
LTC2642
REF
DD
R
FB
15V
INV
–
60201 TA01b
20µs/DIV
V
1/2 LT6020
OUT
V
OUT
+
POWER-ON
RESET
16-BIT DAC
–15V
+
–
CS
16-BIT DATA LATCH
SCLK
DIN
1/2 LT6020
CONTROL
LOGIC
LT5400-1
10kΩ MATCHED
CLR
16-BIT SHIFT REGISTER
RESISTOR NETWORK
GND
60201 TA01a
60201fa
1
For more information www.linear.com/LT6020
LT6020/LT6020-1
absoluTe MaxiMuM raTings
(Note 1)
+
–
Total Supply Voltage (V to V ).................................36V
Differential Input Voltage (within Supplies)...............36V
Operating and Specified Temperature Range
I-Grade.................................................–40°C to 85°C
H-Grade ............................................ .–40°C to 125°C
Junction Temperature ........................................... 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)...................300°C
–
Input Voltage (DGND, EN) (Relative to V )................36V
Input Current (+IN, –IN, DGND, EN) ..................... 10mA
Output Short-Circuit Duration.......................... Indefinite
pin conFiguraTion
TOP VIEW
TOP VIEW
+
OUT A
–IN A
+IN A
1
2
3
4
5
10
9
V
+
OUT A
–IN A
+IN A
1
2
3
4
8
7
6
5
V
TOP VIEW
OUT B
–IN B
+IN B
EN
+
OUT B
–IN B
+IN B
A
OUTA 1
–INA 2
8 V
A
11
9
8
7 OUTB
6 –INB
5 +INB
B
A
–
V
7
+INA
3
4
B
–
B
–
V
V
DGND
6
MS8 PACKAGE
8-LEAD PLASTIC MSOP
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
θ
= 163°C/W, θ = 40°C/W
JC
JA
θ
= 43°C/W, θ = 5.5°C/W
θ
= 43°C/W, θ = 5.5°C/W
JA
JC
JA JC
EXPOSED PAD (PIN 11) IS CONNECTED TO V (PIN 4)
(PCB CONNECTION OPTIONAL)
–
–
EXPOSED PAD (PIN 9) IS CONNECTED TO V (PIN 4)
(PCB CONNECTION OPTIONAL)
orDer inForMaTion
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
LGMC
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT6020IDD#PBF
LT6020IDD#TRPBF
LT6020HDD#TRPBF
LT6020IDD-1#TRPBF
LT6020HDD-1#TRPBF
LT6020IMS8#TRPBF
LT6020HMS8#TRPBF
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
10-Lead (3mm × 3mm) Plastic DFN
10-Lead (3mm × 3mm) Plastic DFN
8-Lead Plastic MSOP
–40°C to 85°C
–40°C to 125°C
–40°C to 85°C
–40°C to 125°C
–40°C to 85°C
–40°C to 125°C
LT6020HDD#PBF
LT6020IDD-1#PBF
LT6020HDD-1#PBF
LT6020IMS8#PBF
LT6020HMS8#PBF
LGMC
LGKF
LGKF
LTGJG
LTGJG
8-Lead Plastic MSOP
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/
60201fa
2
For more information www.linear.com/LT6020
LT6020/LT6020-1
elecTrical characTerisTics The l denotes the specifications which apply over the specified
temperature range, otherwise specifications are at TA = 25°C, VS = 15V, VCM = VOUT = Mid-Supply, VDGND = 0V, VEN = 5V. DGND
and EN specifications only apply to the LT6020-1.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
DD Packages
A
T = –40° to 125°C
A
20
70
110
120
µV
µV
µV
OS
l
l
T = –40° to 85°C
MS8 Package
A
T = –40° to 125°C
A
5
30
70
80
µV
µV
µV
l
l
T = –40° to 85°C
l
l
l
∆V
Input Offset Voltage Drift (Note 2)
DD Packages
MS8 Package
–0.8
–0.5
0.3
0.2
0.2
0.8
0.5
µV/°C
µV/°C
µV/Mo
OSI
∆Temp
∆V
Long Term Input Offset Voltage Stability
Input Bias Current
OSI
∆Time
I
–3
–3
–10
0.1
0.1
1.1
3
3
10
nA
nA
nA
B
T = –40° to 85°C
l
l
A
T = –40° to 125°C
A
I
Input Offset Current
–1
–1
–2
1
1
2
nA
nA
nA
OS
T = –40° to 85°C
l
l
A
T = –40° to 125°C
A
Input Noise Voltage
0.1Hz to 10Hz
µV
P-P
e
n
Input Noise Voltage Density
f = 10Hz
f = 1kHz
50
46
nV/√Hz
nV/√Hz
in
Input Noise Current Density
Input Capacitance
f = 1kHz
37
fA/√Hz
C
Common Mode
Differential Mode
1.5
2.5
pF
pF
IN
R
Input Resistance
Common Mode
Differential Mode
17
20
GΩ
MΩ
IN
–
+
l
l
l
l
l
V
Common Mode Input Range
V + 1.2
V – 1.4
V
ICM
CMRR
Common Mode Rejection Ratio
V
= –13.8V to 13.6V
120
120
132
140
116
138
130
dB
dB
CM
PSRR
Supply Rejection Ratio
V = 3V to 30V
120
118
dB
dB
S
A
Large-Signal Voltage Gain
R = 6.98kΩ, V
= 14V
110
108
dB
dB
VOL
L
OUT
R = 100kΩ, V
= 14.5V
126
126
dB
dB
L
OUT
–
V
V
Output Swing Low (V
– V )
R = 10kΩ
200
250
300
mV
mV
mV
OL
OH
OUT
L
l
l
T = –40° to 85°C
A
T = –40° to 125°C
A
+
Output Swing High (V – V
Short-Circuit Current
)
R = 10kΩ
100
8
140
165
190
mV
mV
mV
OUT
L
l
l
T = –40° to 85°C
A
T = –40° to 125°C
A
I
V
= 0V, Sourcing
OUT
mA
mA
mA
SC
l
l
T = –40° to 85°C
5.5
5
A
T = –40° to 125°C
A
V
A
= 0V, Sinking
11
mA
mA
mA
OUT
l
l
T = –40° to 85°C
5.5
5.5
T = –40° to 125°C
A
60201fa
3
For more information www.linear.com/LT6020
LT6020/LT6020-1
elecTrical characTerisTics The l denotes the specifications which apply over the specified
temperature range, otherwise specifications are at TA = 25°C, VS = 15V, VCM = VOUT = Mid-Supply, VDGND = 0V, VEN = 5V. DGND
and EN specifications only apply to the LT6020-1.
SYMBOL PARAMETER
CONDITIONS
= 1, 10V Step
MIN
TYP
MAX
UNITS
SR
Slew Rate
A
3
2.4
2.4
5
V/μs
V/μs
V/μs
VCL
l
l
T = –40° to 85°C
A
T = –40° to 125°C
A
A
A
= 1, 5V Step
1.4
1.1
1
2.4
V/μs
V/μs
V/μs
VCL
l
l
T = –40° to 85°C
T = –40° to 125°C
A
l
l
GBW
Gain-Bandwidth Product
Minimum Supply Voltage
Supply Current per Amplifier
f = 10kHz
290
3
400
90
kHz
V
O
Guaranteed by PSRR
I
100
125
140
μA
μA
μA
S
T = –40° to 85°C
l
l
A
T = –40° to 125°C
A
Supply Current in Shutdown
V
A
= 0.8V
1.4
3
3.2
3.6
μA
μA
μA
EN
T = –40° to 85°C
l
l
T = –40° to 125°C
A
t
t
Settling Time (A = 1)
0.1% 5V Output Step
6
μs
μs
μs
μs
s
V
0.01% 5V Output Step
0.0015% 5V Output Step
0.0015% 10V Output Step
7.8
13.8
12.4
Enable Time
A = 1
V
100
µs
V
ON
–
+
l
l
l
l
l
V
DGND Pin Voltage Range
DGND Pin Current
V
V – 3
DGND
DGND
EN
I
I
–200
–100
–400
–200
0.8
nA
nA
V
EN Pin Current
V
V
EN Pin Input Low Voltage
EN Pin Input High Voltage
Relative to DGND
Relative to DGND
ENL
ENH
1.7
V
60201fa
4
For more information www.linear.com/LT6020
LT6020/LT6020-1
elecTrical characTerisTics The l denotes the specifications which apply over the specified
temperature range, otherwise specifications are at TA = 25°C, VS = 3V, VCM = VOUT = Mid-Supply, VDGND = 0V, VEN = 3V. DGND and
EN pin specifications only apply to the LT6020-1.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
DD Packages
A
T = –40° to 125°C
A
20
100
140
150
µV
µV
µV
OS
l
l
T = –40° to 85°C
MS8 Package
A
T = –40° to 125°C
A
5
45
85
95
µV
µV
µV
l
l
T = –40° to 85°C
l
l
l
∆V
Input Offset Voltage Drift (Note 2)
DD Packages
MS8 Package
–0.8
–0.5
0.3
0.2
0.2
0.8
0.5
µV/°C
µV/°C
µV/Mo
OSI
∆Temp
∆V
OSI
Long Term Input Offset Voltage Stability
∆Time
I
I
Input Bias Current
1
0.1
1.1
nA
nA
B
Input Offset Current
Input Noise Voltage
Input Noise Voltage Density
OS
0.1Hz to 10Hz
µV
P-P
e
f = 10Hz
f = 1kHz
50
46
nV/√Hz
nV/√Hz
n
in
Input Noise Current Density
Input Capacitance
f = 1kHz
37
fA/√Hz
C
Common Mode
Differential Mode
1.5
2.5
pF
pF
IN
R
Input Resistance
Common Mode
Differential Mode
17
20
GΩ
MΩ
IN
–
+
l
V
Common Mode Input Range
Common Mode Rejection Ratio
Supply Rejection Ratio
V + 1.2
V – 1.4
V
ICM
CMRR
PSRR
V
= 1.2V to 1.6V
125
140
dB
CM
V = 3V to 30V
120
118
dB
dB
S
l
l
A
Large-Signal Voltage Gain
R = 6.98kΩ, V
= 0.5V to 2.5V
= 0.5V to 2.5V
98
98
108
dB
dB
VOL
L
OUT
R = 100kΩ, V
136
45
dB
L
OUT
–
V
V
Output Swing Low (V
– V )
R = 10kΩ
100
130
150
mV
mV
mV
OL
OH
OUT
L
l
l
T = –40° to 85°C
A
T = –40° to 125°C
A
+
Output Swing High (V – V
Short-Circuit Current
)
R = 10kΩ
55
6
80
90
mV
mV
mV
OUT
L
l
l
T = –40° to 85°C
A
T = –40° to 125°C
100
A
I
V
= 1.5V, Sourcing
OUT
mA
mA
mA
SC
l
l
T = –40° to 85°C
3.5
3.5
A
T = –40° to 125°C
A
V
A
= 1.5V, Sinking
8
mA
mA
mA
OUT
l
l
T = –40° to 85°C
5.5
5.5
T = –40° to 125°C
A
SR
Slew Rate (Note 3)
A
= –1, 2V Step
0.2
V/μs
kHz
V
VCL
GBW
Gain-Bandwidth Product
Minimum Supply Voltage
f = 10kHz
O
400
l
Guaranteed by PSRR
3
60201fa
5
For more information www.linear.com/LT6020
LT6020/LT6020-1
elecTrical characTerisTics The l denotes the specifications which apply over the specified
temperature range, otherwise specifications are at TA = 25°C, VS = 3V, VCM = VOUT = Mid-Supply, VDGND = 0V, VEN = 3V. DGND and
EN pin specifications only apply to the LT6020-1.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
I
Supply Current per Amplifier
85
95
120
135
μA
μA
μA
S
T = –40° to 85°C
A
l
l
A
T = –40° to 125°C
Supply Current in Shutdown
V
A
= 0.8V
0.9
1.1
1.5
3
μA
μA
μA
EN
T = –40° to 85°C
l
l
T = –40° to 125°C
A
t
t
Settling Time (A = –1)
0.1% 2.4V Output Step
0.01% 2.4V Output Step
0.0015% 2.4V Output Step
12.4
21.2
39.2
μs
μs
μs
s
V
Enable Time
A = 1
V
120
µs
V
ON
–
+
l
V
DGND Pin Voltage Range
DGND Pin Current
V
V – 3
DGND
DGND
EN
I
I
–200
–100
nA
nA
V
EN Pin Current
l
l
V
V
EN Pin Input Low Voltage
EN Pin Input High Voltage
Relative to DGND
Relative to DGND
0.8
ENL
ENH
1.7
V
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 3: The slew rate of the LT6020 increases with the size of the
input step. At lower supplies, the input step size is limited by the input
common mode range. This trend can be seen in the Typical Performance
Characteristics.
Note 2: Guaranteed by design.
60201fa
6
For more information www.linear.com/LT6020
LT6020/LT6020-1
Typical perForMance characTerisTics
TA = 25°C, VS = 15V, RL = 100kΩ, unless
otherwise specified.
Typical Distribution of Input
Offset Voltage
Typical Distribution of Input
Offset Voltage
Typical Distribution of Input
Offset Voltage Drift
1400
1200
1000
800
600
400
200
0
4000
3500
3000
2500
2000
1500
1000
500
40
2932 PARTS
MS8 PACKAGE
14930 PARTS
DD8 AND DD10 PACKAGES
144 UNITS
DD8 AND DD10
35
PACKAGES
30
25
20
15
10
5
0
0
–30 –20 –10
0
10
20
30
–70 –50 –30 –10 0 10
30
50
70
–0.80 –0.60 –0.40 –0.20
INPUT OFFSET VOLTAGE DRIFT (µV/°C)
60201 G33
0
0.20 0.40
INPUT OFFSET VOLTAGE (µV)
INPUT OFFSET VOLTAGE (µV)
60201 G31
60201 G32
Typical Distribution of Input
Offset Voltage
Voltage Offset Shift vs Lead Free
IR Reflow
100
90
80
70
60
50
40
30
20
10
0
14
350 UNITS
MS8 PACKAGE
40 PARTS
MS8 PACKAGE
12
10
8
6
4
2
0
–0.50 –0.40 –0.30 –0.20 –0.10
0
0.10
–2
0
2
4
6
8
10
12
INPUT OFFSET VOLTAGE DRIFT (µV/°C)
INPUT VOLTAGE OFFSET SHIFT (µV)
60201 G34
60201 G35
Offset Voltage vs Input Common
Mode Voltage
Warm-Up Drift
Offset Voltage vs Supply Voltage
5
4
30
20
40
30
3
20
2
10
10
1
0
0
0
–1
–2
–10
–20
–30
–40
10
–3
–4
–5
–20
–30
1
2
3
4
5
6
7
0
4
8
12 16 20 24 28 32 36
–15
–10
INPUT COMMON MODE VOLTAGE (V)
60201 G03
–5
0
5
10
15
TIME (ms)
TOTAL SUPPLY VOLTAGE (V)
60201 G01
60201 G02
60201fa
7
For more information www.linear.com/LT6020
LT6020/LT6020-1
Typical perForMance characTerisTics
TA = 25°C, VS = 15V, RL = 100kΩ, unless
otherwise specified.
Input Bias Current vs
Temperature
Input Bias Current vs Differential
Input Voltage
0.1Hz to 10Hz Voltage Noise
4
1.00
0.75
0.50
3
2
IB–
IB+
0.25
0
500nV/DIV
1
0
–0.25
–0.50
–0.75
–1.00
–1
1s/DIV
–50 –25
0
25
50
75 100 125
–6 –5 –4 –3 –2 –1
0
1
2
3
4
5
6
TEMPERATURE (°C)
DIFFERENTIAL INPUT VOLTAGE (V)
60201 G06
60201 G04
60201 G05
Voltage Noise Density vs
Frequency
Maximum Undistorted Output
Amplitude vs Frequency
Large-Signal Transient Response
(5V Step)
1000
100
10
35
30
25
20
15
10
5
THD < 40dBc
A
= 1
V
1V/DIV
0
60201 G09
10µs/DIV
0.01
0.1
1
10
100
1k
10k
0.1
1
10
FREQUENCY (Hz)
FREQUENCY (kHz)
60201 G07
60201 G08
Large-Signal Transient Response
(10V Step)
Slew Rate vs Temperature
(5V Step)
Slew Rate vs Temperature
(10V Step)
5
7
6
5
4
3
2
1
0
A
= 1
V
RISING EDGE
4
3
2
1
0
RISING EDGE
FALLING EDGE
FALLING EDGE
2V/DIV
60201 G10
10µs/DIV
–50 –25
0
25
50
75 100 125
–50 –25
0
25
50
75 100 125
TEMPERATURE (°C)
TEMPERATURE (°C)
60201 G11
60201 G12
60201fa
8
For more information www.linear.com/LT6020
LT6020/LT6020-1
Typical perForMance characTerisTics TA = 25°C, VS = 15V, RL = 100kΩ unless
otherwise specified.
Slew Rate vs Input Step
Small-Signal Transient Response
Overshoot vs Capacitive Load
8
7
6
5
4
3
2
1
0
50
45
40
35
30
25
20
15
10
5
300pF
A = 1
V
A
= 1
A
= 1
V
V
FALLING EDGE
100pF
V
=
1ꢀ5V
S
0pF
5mV/DIV
RISING EDGE
V
= 15V
S
60201 G14
2µs/DIV
0
0
5
10
15
20
25
30
0
100 200 300 400 500 600 700 800 900 1000
INPUT STEP SIZE (V
)
CAPACITIVE LOAD (pF)
P-P
60201 G13
60201 G15
Open-Loop Gain and Phase
vs Frequency
PSRR vs Frequency
CMRR vs Frequency
160
140
120
100
80
140
120
100
80
140
120
100
80
–45
V
= 30V
S
–90
–PSRR
–135
–180
–225
60
+PSRR
60
V
= 3V
S
40
60
40
40
20
0
20
20
0
0
–20
0.01 0.1
1
10 100 1k 10k 100k 1M
0.1
1
10
100
1k 10k 100k 1M
1
10 100
1k
10k 100k 1M 10M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
60201 G16
60201 G17
60201 G18
Gain vs Frequency
Open Loop Gain vs Load
Output Impedance vs Frequency
3
0
150
140
130
120
110
100
90
1000
100
10
C
A
= 330pF
= 1
V
= 14.5V
L
V
OUT
–3
C
A
= 100pF
= 1
L
V
1
–6
–9
80
0.1
C
A
= 100pF
= –1
L
V
70
–12
60
0.01
10k
100k
FREQUENCY (Hz)
1M
0.1
1
10
100
1000
10k
100k
1M
10M
LOAD CURRENT (mA)
FREQUENCY (Hz)
60201 G19
60201 G20
60201 G21
60201fa
9
For more information www.linear.com/LT6020
LT6020/LT6020-1
Typical perForMance characTerisTics TA = 25°C, VS = 15V, RL = 100kΩ unless
otherwise specified.
Shutdown Supply Current vs
Temperature
Supply Current vs Supply Voltage
Start-Up Response
160
140
120
100
3.0
2.5
2.0
1.5
1.0
0.5
0
125°C
85°C
V
EN
5V/DIV
0V
25°C
V
= 30V
S
80
60
40
–40°C
+
I(V )
200µA/DIV
V
= 3V
S
20
0
0µA
20µs/DIV
0
5
10
15
20
25
30
–50 –25
0
25
50
75 100 125
TOTAL SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
60201 G24
60201 G22
60201 G23
Output Saturation Voltage vs
Sink Current (Output Low)
Output Saturation Voltage vs
Source Current (Output High)
Enable/Disable Response
1
1
A
V
= 1
IN
V
T
= 125°C
T
= 125°C
A
A
= 5V AT 50kHz
P-P
V
EN
T
= 85°C
T
= 85°C
A
A
5V/DIV
0V
0V
0.1
0.1
T
= –40°C
A
T
= –40°C
A
T
= 25°C
A
V
OUT
T
= 25°C
A
5V/DIV
0.01
0.01
100µs/DIV
0.1
1
10
0.1
1
10
LOAD CURRENT (mA)
LOAD CURRENT (mA)
60201 G24
60201 G26
60201 G27
Positive Output Overdrive
Recovery
Negative Output Overdrive
Recovery
Crosstalk vs Frequency
–40
–60
A
= –100
A
= –100
V
V
= 0V
DGND
V
V
= 5V
EN
INPUT
200mV/DIV
OUTPUT
5V/DIV
0V
–80
0V
–100
–120
–140
INPUT
200mV/DIV
OUTPUT
5V/DIV
100µs/DIV
100µs/DIV
100
1k
10k
100k
1M
FREQUENCY (Hz)
60201 G30
60201 G29
60201 G28
60201fa
10
For more information www.linear.com/LT6020
LT6020/LT6020-1
pin FuncTions
OUT: Amplifier Output.
EN (LT6020-1 Only): Enable Input. This pin must be
+
connected high, normally to V , for the amplifiers to be
–IN: Inverting Input of the Amplifier.
+IN: Noninverting Input of the Amplifier.
functional. EN is active high with the threshold approxi-
mately two diodes above DGND. EN cannot be floated.
The shutdown threshold voltage is specified with respect
to the voltage on the DGND pin.
–
V : Negative Power Supply. A bypass capacitor should be
used between supply pins and ground. Additional bypass
capacitance may be used between the power supply pins.
+
V : Positive Power Supply. A bypass capacitor should be
used between supply pins and ground. Additional bypass
capacitance may be used between the power supply pins.
DGND(LT6020-1Only):ReferenceforENPin.Itisnormally
–
+
tied to ground. DGND must be in the range from V to V
+
–3V. If grounded, V must be ≥ 3V. The EN pin threshold
is specified with respect to the DGND pin. DGND cannot
be floated.
siMpliFieD scheMaTic
+
LT6020-1 ONLY
V
LOAD
5k
200k
CLASS AB
DRIVE
+IN
EN
OUT
5k
–IN
200k
DGND
–
V
60201 BD
applicaTions inForMaTion
Preserving Low Power Operation
The choice of feedback resistor values impacts several
op-amp parameters as noted in the feedback compo-
nents section. It should also be noted that the output of
the amplifier must drive this network. For example, in a
gain of two with a total feedback resistance of 10kΩ and
an output voltage of 14V, the amplifier’s output will need
to supply 1.4mA of current. This current will ultimately
come from a supply.
The proprietary circuitry used in the LT6020 provides an
excellent combination of low power, low offset and en-
hancedslewrate.Normallyanamplifierwithhighersupply
current would be required to achieve this combination of
slew rate and precision. Special care must be taken to
ensure that the low power operation is preserved.
60201fa
11
For more information www.linear.com/LT6020
LT6020/LT6020-1
applicaTions inForMaTion
smaller inputs the LT6020 slew rate approaches the slew
rate more common in traditional micropower amplifiers.
The supply current of the LT6020 increases with large
differential input voltages. Normally, this does not impact
the low power nature of the LT6020 because the ampli-
fier is forcing the two inputs to be at the same potential.
Conditionswhichcausedifferentialinputvoltagetoappear
should be avoided in order to preserve the low power dis-
sipation of the LT6020. This includes but is not limited
to: operation as a comparator, excessive loading on the
output and overdriving the input.
Input Bias Current
The design of the input stage of the LT6020 is more so-
phisticated than that shown in the Simplified Schematic.
It uses both NPN and PNP input differential amplifiers to
sense the input differential voltage. As a result the speci-
fied input bias current can flow in or out of the input pins.
Enhanced Slew Rate
Multiplexer Applications/High Dynamic Input
Impedance
The LT6020 uses a proprietary input stage which provides
an enhanced slew rate without sacrificing input precision
specssuchasinputoffsetvoltage,commonmoderejection
andnoise.TheuniqueinputstageoftheLT6020allowsthe
output to quickly slew to its final value when large signal
input steps are applied. This enhanced slew characteristic
allows the LT6020 to quickly settle the output to 0.0015%
independent of input step size as shown in Figure 1. Typi-
calmicropoweramplifierscannotprocesslargeamplitude
signals with this speed. As shown in the Typical Perfor-
mance curves, when the LT6020 is configured in unity
gain and a 10V step is applied to the input the output will
slew at 5V/µs. In this same configuration, a 5V input step
will slew the output at 2.4V/µs. Furthermore, a 0.7V input
step will lower the slew rate to 0.2V/µs. Note that for these
The LT6020 has features which make it desirable for
multiplexer applications, such as the application featured
on the back page of this data sheet. When the channels of
the multiplexer are cycled, the output of the multiplexer
can produce large voltage transitions. Normally, bipolar
amplifiers have back-to-back diodes between the inputs,
whichwillturnonwhentheinputtransientvoltageexceeds
0.7V, causing a large transient current to be conducted
from the amplifier output stage back into the input driving
circuitry. The driving circuitry then needs to absorb this
current and settle before the amplifier can settle. The
LT6020 uses 5.5V Zener diodes to protect its inputs which
dramaticallyincreasesitsinputimpedancewithinputsteps
as large as 5V.
30
Achieving Rail-to-Rail Operation without
Rail-to-Rail Inputs
A
= 1
V
25
20
15
10
5
The LT6020 output is able to swing close to each power
supply rail, but the input stage is limited to operating
–
+
between V + 1.2V and V – 1.4V. For many inverting
applications and noninverting gain applications, this is
largely inconsequential. Figure 2 shows the basic op amp
configurations, what happens to the op amp inputs and
whether or not the op amp must have rail-to-rail inputs.
0.0015%
0.01%
20
0
5
10
15
25
The circuit of Figure 3 shows an extreme example of the
inverting case. The input voltage at the 100k resistor can
swing 13.5V and the LT6020 will output an inverted,
OUTPUT STEP (V
)
P-P
60201 F01
Figure 1. Settling Time Is Essentially Flat
60201fa
12
For more information www.linear.com/LT6020
LT6020/LT6020-1
applicaTions inForMaTion
V
+
–
V
+
–
V
IN
+
REF
IN
R
G
V
–
IN
R
F
R
F
60201 F02
R
G
V
REF
INVERTING: A = –R /R
NONINVERTING: A = 1 + R /R
G
NONINVERTING: A = 1
V
V
F
G
V
F
OP AMP INPUTS DO NOT MOVE,
BUT ARE FIXED AT DC BIAS
INPUTS MOVE BY AS MUCH AS
INPUTS MOVE BY AS MUCH AS
OUTPUT
V
, BUT THE OUTPUT MOVES
IN
POINT V
MORE
REF
INPUT MUST BE RAIL-TO-RAIL
FOR OVERALL CIRCUIT
RAIL-TO-RAIL PERFORMANCE
INPUT DOES NOT HAVE TO BE
RAIL-TO-RAIL
INPUT MAY NOT HAVE TO BE
RAIL-TO-RAIL
Figure 2. Some Op Amp Configurations Do Not Require Rail-to-Rail Inputs to Achieve Rail-to-Rail Outputs
1.5V
1.ꢀ5V
OUTPUT
SWING
the specified input voltage range as shown in Figure 4.
Howevertheopenloopgainissignificantlyreduced.While
the output roughly tracks the input, the reduction in open
loop gain degrades the accuracy of the LT6020 in this
region. Exceeding the input common mode range also
causesasignificantincreaseininputbiascurrentasshown
in Figure 5. The output of the LT6020 is guaranteed over
thespecifiedtemperaturerangenottophaseinvertaslong
as the input voltage does not exceed the supply voltage.
1ꢀ.5V SWINGS
WELL OUTSIDE
SUPPLY RAILS
+
–
LT6020
V
IN
100k, 0.1%
10k, 0.1%
–1.5V
1880 F0ꢀ
Figure 3. Extreme Inverting Case: Circuit Operates Properly
with Input Voltage Swing Well Outside Op Amp Supply Rails
Preserving Input Precision
Preserving the input accuracy of the LT6020 requires
that the application circuit and PC board layout do not
divided-by-ten version of the input voltage. The output
accuracy is limited by the resistors to 0.2%. Output
referred, this error becomes 2.7mV. The 30µV input offset
voltage contribution, plus the additional error due to input
bias current times the ~10k effective source impedance,
contribute only negligibly to error.
20V
V
A
= 15V
= 1
S
V
INPUT
+V LIMIT
CM
10V
5V/DIV 0V
–10V
OUTPUT
Phase Inversion
–
TheLT6020inputstageislimitedtooperatingbetweenV +
+
1.2VandV –1.4V.Exceedingthiscommonmoderangewill
–V LIMIT
CM
causetheopenloopgaintodropsignificantly.Foraunitygain
amplifier, the output roughly tracks the input well beyond
–20V
200µs/DIV
60201 F04
Figure 4. No Phase Inversion
60201fa
13
For more information www.linear.com/LT6020
LT6020/LT6020-1
applicaTions inForMaTion
70
10pF
100k
60
50
40
30
–
20
100k
LT6020
C
PAR
10
V
OUT
+
0
V
IN
60201 F06
–10
–20
–30
Figure 6. Stability with Parasitic Input Capacitance
–15
–10
–5
0
5
10
15
Capacitive Loads
INPUT COMMON MODE VOLTAGE (V)
60201 F05
The LT6020 can drive capacitive loads up to 100pF in
unity gain. The capacitive load driving capability increases
as the amplifier is used in higher gain configurations. A
small series resistance between the output and the load
will further increase the amount of capacitance that the
amplifier can drive.
Figure 5. Increased Ib Beyond VICM
introduce errors comparable to or greater than the offset
of the amplifiers. Temperature differentials across the
input connections can generate thermocouple voltages of
tens of microvolts so the connections of the input leads
should be short, close together and away from heat dis-
sipating components. Air currents across the board can
also generate temperature differentials.
Shutdown Operation (LT6020-1)
The LT6020-1 shutdown function has been designed
to be easily controlled from single supply logic or
As is the case with all amplifiers, a change in load
current changes the finite open loop gain. Increased load
current reduces the open loop gain as seen in the Typical
Performance Characteristics section. This results in a
changeininputoffsetvoltage.Underlargesignalconditions
with load currents of 2mA the effective change in input
error is just tens of microvolts. In precision applications it
is important to consider amplifier loading when selecting
feedbackresistorvaluesaswellas theloadsonthedevice.
microcontollers.ToenabletheLT6020-1whenV
=0V
DGND
the enable pin must be driven above 1.7V. Conversely, to
enter the low power shutdown mode the enable pin must
be driven below 0.8V. In a 15V dual supply application
where V
= –15V, the enable pin must be driven above
DGND
~ –13.3V to enable the LT6020-1. If the enable pin is
driven below –14.2V the LT6020-1 enters the low power
shutdown mode. Note that to enable the LT6020-1 the
enable pin voltage can range from –13.3V to 15V whereas
to disable the LT6020-1 the enable pin can range from
–15V to –14.2V. Figure 7 shows examples of enable pin
control. While in shutdown, the outputs of the LT6020-1
are high impedance.
Feedback Components
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, in
a gain of +2 configuration, with 100k feedback resistors
and a poorly designed circuit board layout with parasitic
capacitance of 10pF (amplifier + PC board) at the ampli-
fier’s inverting input will cause the amplifier to have poor
phasemarginduetoapoleformedat320kHz.Anadditional
capacitor of 10pF across the feedback resistor as shown
in Figure 6 will eliminate any ringing or oscillation.
The LT6020-1 is typically capable of coming out of
shutdown within 100µs. This is useful in power sensitive
applications where duty cycled operation is employed
such as wireless mesh networks. In these applications the
system is in low power mode the majority of the time, but
then needs to wake up quickly and settle for an acquisition
before being powered back down to save power.
60201fa
14
For more information www.linear.com/LT6020
LT6020/LT6020-1
applicaTions inForMaTion
≥ –13.3V
ON
≥ 1.7V
ON
≥ 1.7V
ON
≥ 1.7V
ON
≥ 0.2V
ON
≤ –14.2V
OFF
≤ 0.8V
OFF
≤ 0.8V
OFF
≤ 0.8V
OFF
≤ –0.7V
OFF
+15
+15
+30
+3V
+1.5
+
+
+
+
+
TO V OR
EN LOGIC
TO V OR
EN LOGIC
TO V OR
EN LOGIC
TO V OR
EN LOGIC
TO V OR
EN LOGIC
EN
EN
EN
EN
EN
+
+
+
+
+
LT6020-1
LT6020-1
LT6020-1
LT6020-1
LT6020-1
DGND
DGND
DGND
DGND
DGND
–
–
–
–
–
–15
–15
–1.5
HIGH VOLTAGE
SPLIT SUPPLIES
HIGH VOLTAGE
SPLIT SUPPLIES
HIGH VOLTAGE
SINGLE SUPPLY
LOW VOLTAGE
SINGLE SUPPLY
LOW VOLTAGE
SPLIT SUPPLIES
60201 F07
Figure 7. LT6020-1 Enable Pin Control Examples
Typical applicaTions
High Open-Loop Gain Composite Amplifier
4.7pF
10k
270pF
10k
–
V
IN
+
1/2 LT6020
+
V
1/2 LT6020
–
OUT
60201 F02a
Parallel Amplifiers Achieves 32nV/√Hz Noise, Doubles Output Drive and Lowers Offset
+
V
IN
1/2 LT6020
–
100Ω
V
OUT
+
100Ω
1/2 LT6020
–
60201 F02b
60201fa
15
For more information www.linear.com/LT6020
LT6020/LT6020-1
package DescripTion
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
DD Package
8-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1698 Rev C)
0.70 ±0.05
3.5 ±0.05
2.10 ±0.05 (2 SIDES)
1.65 ±0.05
PACKAGE
OUTLINE
0.25 ±0.05
0.50
BSC
2.38 ±0.05
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
R = 0.125
0.40 ±0.10
TYP
5
8
3.00 ±0.10
(4 SIDES)
1.65 ±0.10
(2 SIDES)
PIN 1
TOP MARK
(NOTE 6)
(DD8) DFN 0509 REV C
4
1
0.25 ±0.05
0.75 ±0.05
0.200 REF
0.50 BSC
2.38 ±0.10
BOTTOM VIEW—EXPOSED PAD
0.00 – 0.05
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1)
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 TOP AND BOTTOM OF PACKAGE
60201fa
16
For more information www.linear.com/LT6020
LT6020/LT6020-1
package DescripTion
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
DD Package
10-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1699 Rev C)
0.70 ±0.05
3.55 ±0.05
2.15 ±0.05 (2 SIDES)
1.65 ±0.05
PACKAGE
OUTLINE
0.25 ±0.05
0.50
BSC
2.38 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
R = 0.125
0.40 ±0.10
TYP
6
10
3.00 ±0.10
(4 SIDES)
1.65 ±0.10
(2 SIDES)
PIN 1 NOTCH
R = 0.20 OR
PIN 1
TOP MARK
(SEE NOTE 6)
0.35 × 45°
CHAMFER
(DD) DFN REV C 0310
5
1
0.25 ±0.05
0.50 BSC
0.75 ±0.05
0.200 REF
2.38 ±0.10
(2 SIDES)
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-2).
CHECK THE LTC WEBSITE DATA SHEET FOR CURRENT STATUS OF VARIATION ASSIGNMENT
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
60201fa
17
For more information www.linear.com/LT6020
LT6020/LT6020-1
package DescripTion
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1ꢀꢀ0 Rev G)
0.889 0.127
(.035 .005)
5.10
3.20 – 3.45
(.201)
(.12ꢀ – .13ꢀ)
MIN
3.00 0.102
(.118 .004)
(NOTE 3)
0.52
(.0205)
REF
0.ꢀ5
(.025ꢀ)
BSC
0.42 0.038
(.01ꢀ5 .0015)
TYP
8
7 ꢀ 5
RECOMMENDED SOLDER PAD LAYOUT
3.00 0.102
(.118 .004)
(NOTE 4)
4.90 0.152
(.193 .00ꢀ)
DETAIL “A”
0.254
(.010)
0° – ꢀ° TYP
GAUGE PLANE
1
2
3
4
0.53 0.152
(.021 .00ꢀ)
1.10
(.043)
MAX
0.8ꢀ
(.034)
REF
DETAIL “A”
0.18
(.007)
SEATING
PLANE
0.22 – 0.38
0.101ꢀ 0.0508
(.009 – .015)
(.004 .002)
0.ꢀ5
(.025ꢀ)
BSC
TYP
MSOP (MS8) 0213 REV G
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 (.00ꢀ") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.00ꢀ") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
60201fa
18
For more information www.linear.com/LT6020
LT6020/LT6020-1
revision hisTory
REV
DATE
DESCRIPTION
PAGE NUMBER
A
04/14 Added MS8 package version.
All
60201fa
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.
19
LT6020/LT6020-1
Typical applicaTion
Gain of 11 Instrumentation Amplifier
Improved Load Drive Capability
+
V
R4, 100k
R3, 10k
R2, 10k
R1, 100k
2N3904
–
–
+
1k
V
IN
V
OUT
1/2 LT6020
+
1/2 LT6020
+
V
LT6020
OUT
–
V
INM
–3dB BW = 30kHz
2N3906
V
INP
–
V
R1 TO R4: FOR HIGH DC CMRR USE LT5400-3
60201 F03a
60201 F03b
13.6V Input Range MUX Buffer
MUX Buffer Response, 12V Step
1/2 LTC203
15V
IN1
IN2
S1
5
+
V
0
15V
V
IN1
D1
D2
+
–6V
1/2 LT6020
V
IN2
6V
S2
–
–
GND
V
15V
60201 TA03c
–15V
relaTeD parTs
PART NUMBER
LTC6256
LT1352
DESCRIPTION
COMMENTS
6.5MHz, 65µA RRIO Op Amp
3MHz. 200V/µs Op Amp
5MHz, 3V/µs Op Amp
V
OS
V
OS
V
OS
: 350µV, GBW: 6.5MHz, SR: 1.8V/µs, e : 20nV/√Hz, I : 65µA
n S
: 600µV, GBW: 3MHz, SR: 200V/µs, e : 14nV/√Hz, I : 330µA
n
S
LT1492
: 180µV, GBW: 5MHz, SR: 3V/µs, e : 16.5nV/√Hz, I : 550µA
n S
LTC5800
LT5400
SmartMesh® Wireless Sensor Network I
Wireless Mesh Networks
0.01% Matching
C
Quad Matched Resistor Network
60201fa
LT0414 REV A • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
20
(408)432-1900 FAX: (408) 434-0507 www.linear.com/LT6020
●
●
LINEAR TECHNOLOGY CORPORATION 2014
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Linear
LT6020IMS8#TRPBF
LT6020/LT6020-1 - Dual Micropower, 5V/µs Precision Rail-to-Rail Output Amplifier; Package: MSOP; Pins: 8; Temperature Range: -40°C to 85°C
Linear
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