LT1490AIS8#TR [Linear]
LT1490A - Dual Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C;型号: | LT1490AIS8#TR |
厂家: | Linear |
描述: | LT1490A - Dual Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C |
文件: | 总18页 (文件大小:228K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LT1490A/LT1491A
Dual/Quad Over-The-Top
Micropower Rail-to-Rail
Input and Output Op Amps
FEATURES
DESCRIPTION
The LT®1490A/LT1491A are dual and quad op amps with a
lowinputoffsetvoltageof500μVmax.TheLT1490A/LT1491A
operate on all single and split supplies with a total voltage of
2V to 44V, drawing only 40μA of quiescent current per ampli-
fier. Theseamplifiersarereversesupplyprotected;theydraw
virtually no current for reverse supply up to 18V. The input
range of the LT1490A/LT1491A includes both supplies and
the output swings to both supplies. Unlike most micropower
op amps, the LT1490A/LT1491A can drive heavy loads; their
rail-to-rail outputs drive 20mA. The LT1490A/LT1491A are
unity-gainstableanddriveallcapacitiveloadsupto10,000pF
when optional 0.22μF and 150Ω compensation is used.
n
Low Input Offset Voltage: 500μV Max
–
n
Output Swings to 10mV Max from V
n
Rail-to-Rail Input and Output
n
Micropower: 50μA/Amplifier Max
Over-The-Top® Input Common Mode Range Extends
n
–
+
44V Above V , Independent of V
n
n
n
n
n
n
n
n
n
n
Specified on 3V, 5V and 15V Supplies
High Output Current: 20mA
Output Drives 10,000pF with Output Compensation
Reverse Battery Protection to 18V
No Supply Sequencing Problems
High Voltage Gain: 1500V/mV
High CMRR: 98dB
No Phase Reversal
Gain Bandwidth Product: 200kHz
Tiny 3mm × 3mm × 0.8mm DFN Package
The LT1490A/LT1491A have a unique input stage that oper-
ates and remains high impedance when above the positive
supply. The inputs take 44V both differential and common
mode even when operating on a 3V supply. Built-in resistors
protect the inputs for faults below the negative supply up to
15V. There is no phase reversal of the output for inputs 15V
below V– or 44V above V–, independent of V+.
APPLICATIONS
n
Battery- or Solar-Powered Systems
Portable Instrumentation
Sensor Conditioning
TheLT1490Adualopampisavailableinthe8-pinMSOP,PDIP
and SO packages. For space limited applications LT1490A is
available in a 3mm × 3mm × 0.8mm, dual fine pitch leadless
package (DFN). The quad LT1491A is available in the 14-pin
SO, PDIP and 5mm × 3mm × 0.8mm DFN packages.
n
Supply Current Sensing
n
Battery Monitoring
n
Micropower Active Filters
n
4mA to 20mA Transmitters
L, LT, LTC, LTM, Over-The-Top, Linear Technology and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners. Protected by U.S. Patents including 5825228.
TYPICAL APPLICATION
Battery Monitor
R
R
S
A
0.2Ω
2k
Q1
2N3904
CHARGER
VOLTAGE
+
R
A´
I
1/4 LT1491A
BATT
–
2k
1/4 LT1491A
LOGIC
–
+
R
B
Q2
2N3904
2k
LOGIC HIGH (5V) = CHARGING
LOGIC LOW (0V) = DISCHARGING
+
R
B´
1/4 LT1491A
2k
–
LOAD
+
+
R
G
1/4 LT1491A
V
OUT
10k
V
= 12V
BATT
–
S1
10k
90.9k
1490A TA01
V
V
=
OUT
OUT
S1 = OPEN, GAIN = 1
S1 = CLOSED, GAIN = 10
R
= R
A
S
B
I
=
AMPS
BATT
(R )(R /R )(GAIN) GAIN
V
= 5V, 0V
S
G
A
14901afd
1
LT1490A/LT1491A
ABSOLUTE MAXIMUM RATINGS (Note 1)
Total Supply Voltage (V+ to V–) ............................... 44V
Differential Input Voltage ......................................... 44V
Input Current (Note 9)......................................... 12mA
Output Short-Circuit Duration (Note 2) ........ Continuous
Operating Temperature Range (Note 3)
Specified Temperature Range (Note 4)
LT1490AC/LT1490AI............................–40°C to 85°C
LT1491AC/LT1491AI.............................–40°C to 85°C
LT1490AH/LT1491AH......................... –40°C to 125°C
Junction Temperature .......................................... 150°C
Junction Temperature (DD/DHC Package) ........... 125°C
Storage Temperature Range ................. –65°C to 150°C
Storage Temperature Range
LT1490AC/LT1491AC ...........................–40°C to 85°C
LT1490AI/LT1491AI .............................–40°C to 85°C
LT1490AH/LT1491AH......................... –40°C to 125°C
DD/DHC Package.............................. –65°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PIN CONFIGURATION
LT1490A
LT1490A
LT1490A
TOP VIEW
TOP VIEW
+
+
TOP VIEW
1
2
3
4
8
7
6
5
OUT A
–IN A
+IN A
V
OUT A
–IN A
+IN A
1
2
3
4
8
7
6
5
V
+
OUT A
–IN A
+IN A
1
2
3
4
8 V
OUT B
–IN B
+IN B
OUT B
–IN B
+IN B
7 OUT B
6 –IN B
5 +IN B
A
A
A
B
B
–
B
–
V
–
V
V
MS8 PACKAGE
8-LEAD PLASTIC MSOP
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
DD PACKAGE
8-LEAD (3mm w 3mm) PLASTIC DFN
8-LEAD PLASTIC SO
T
= 150°C, θ = 250°C/W
JA
JMAX
T
= 150°C, θ = 130°C/W (N8)
= 150°C, θ = 190°C/W (S8)
JMAX
JA
JA
T
= 125°C, θ = 160°C/W (NOTE 2)
JMAX
JA
T
JMAX
–
UNDERSIDE METAL CONNECTED TO V
LT1491A
LT1491A
TOP VIEW
TOP VIEW
A
OUT A
–IN A
+IN A
V+
1
2
3
4
5
6
7
8
16 OUT D
15 –IN D
OUT A
–IN A
+IN A
1
2
3
4
5
6
7
14
13
12
11
10
9
OUT D
D
C
–IN D
+IN D
A
B
D
C
14 +IN D
13 V–
+
–
V
V
+IN B
–IN B
OUT B
NC
12 +IN C
11 –IN C
10 OUT C
+IN B
–IN B
OUT B
+IN C
–IN C
OUT C
B
8
9
NC
N PACKAGE
14-LEAD PDIP
S PACKAGE
DHC16 PACKAGE
16-LEAD (5mm w 3mm) PLASTIC DFN
14-LEAD PLASTIC SO
T
= 150°C, θ = 110°C/W (N)
= 150°C, θ = 150°C/W (S)
JMAX
JA
JA
T
T
= 125°C, θ = 160°C/W (NOTE 2)
JMAX
JMAX
JA
–
UNDERSIDE METAL CONNECTED TO V
14901afd
2
LT1490A/LT1491A
ORDER INFORMATION
LEAD FREE FINISH
LT1490ACMS8#PBF
LT1490AIMS8#PBF
LT1490AHMS8#PBF
LT1490ACS8#PBF
LT1490AIS8#PBF
LT1490AHS8#PBF
LT1490ACN8#PBF
LT1490AIN8#PBF
LT1490ACDD#PBF
LT1490AIDD#PBF
LT1491ACS#PBF
LT1491AIS#PBF
TAPE AND REEL
PART MARKING*
LTNG
PACKAGE DESCRIPTION
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic SO
SPECIFIED TEMPERATURE RANGE
0°C to 70°C
LT1490ACMS8#TRPBF
LT1490AIMS8#TRPBF
LT1490AHMS8#TRPBF
LT1490ACS8#TRPBF
LT1490AIS8#TRPBF
LT1490AHS8#TRPBF
LT1490ACN8#TRPBF
LT1490AIN8#TRPBF
LT1490ACDD#TRPBF
LT1490AIDD#TRPBF
LT1491ACS#TRPBF
LT1491AIS#TRPBF
LT1491AHS#TRPBF
LT1491ACN#TRPBF
LT1491AIN#TRPBF
LT1491ACDHC#TRPBF
LT1491AIDHC#TRPBF
LTPU
–40°C to 85°C
LTRK
–40°C to 125°C
0°C to 70°C
1490A
1490AI
8-Lead Plastic SO
–40°C to 85°C
1490AH
8-Lead Plastic SO
–40°C to 125°C
0°C to 70°C
LT1490ACN8
LT1490AIN8
LAAH
8-Lead PDIP
8-Lead PDIP
–40°C to 85°C
0°C to 70°C
8-Lead (3mm × 3mm) Plastic DFN
8-Lead (3mm × 3mm) Plastic DFN
14-Lead Plastic SO
LAAH
–40°C to 85°C
0°C to 70°C
LT1491ACS
LT1491AIS
LT1491AHS
LT1491ACN
LT1491AIN
1491A
14-Lead Plastic SO
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
LT1491AHS#PBF
LT1491ACN#PBF
LT1491AIN#PBF
14-Lead Plastic SO
14-Lead PDIP
14-Lead PDIP
–40°C to 85°C
0°C to 70°C
LT1491ACDHC#PBF
LT1491AIDHC#PBF
16-Lead (5mm × 3mm) Plastic DFN
16-Lead (5mm × 3mm) Plastic DFN
1491A
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard 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/
14901afd
3
LT1490A/LT1491A
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating
temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply
unless otherwise noted. (Note 4)
LT1490AC/LT1491AC
LT1490AI/LT1491AI
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage (Note 5)
LT1490A N, S Packages
110
500
700
800
μV
μV
μV
l
l
0°C ≤ T ≤ 70°C
A
–40°C ≤ T ≤ 85°C
A
LT1490A MS8 Package, LT1491A N, S Packages
220
250
1000
1200
1400
μV
μV
μV
l
l
0°C ≤ T ≤ 70°C
A
–40°C ≤ T ≤ 85°C
A
LT1490A DD, LT1491A DHC
1200
1400
1600
μV
μV
μV
l
l
0°C ≤ T ≤ 70°C
A
–40°C ≤ T ≤ 85°C
A
l
l
Input Offset Voltage Drift (Note 9)
Input Offset Current
–40°C ≤ T ≤ 85°C
2
2
4
6
μV/°C
μV/°C
A
LT1490A DD, LT1491A DHC, –40°C ≤ T ≤ 85°C
A
l
l
I
I
0.2
0.8
0.8
nA
μA
OS
V
= 44V (Note 6)
= 44V (Note 6)
CM
l
l
Input Bias Current
1
3
0.3
8
10
nA
μA
nA
B
V
CM
V = 0V
S
l
Input Bias Current Drift
Input Noise Voltage
–40°C ≤ T ≤ 85°C
2
1
pA/°C
A
0.1Hz to 10Hz
f = 1kHz
μV
P-P
e
n
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
50
nV/√Hz
pA/√Hz
i
n
f = 1kHz
0.015
R
IN
Differential
6
4
17
11
Mꢀ
Mꢀ
Common Mode, V = 0V to 44V
CM
C
IN
Input Capacitance
4.6
pF
V
l
Input Voltage Range
0
44
l
l
CMRR
Common Mode Rejection Ratio
(Note 6)
V
V
= 0V to V – 1V
84
80
98
98
dB
dB
CM
CM
CC
= 0V to 44V
A
Large-Signal Voltage Gain
V = 3V, V = 500mV to 2.5V, R = 10k
200
133
100
1500
V/mV
V/mV
V/mV
VOL
S
O
L
l
l
0°C ≤ T ≤ 70°C
A
–40°C ≤ T ≤ 85°C
A
V = 5V, V = 500mV to 4.5V, R = 10k
400
250
200
1500
V/mV
V/mV
V/mV
S
O
L
l
l
0°C ≤ T ≤ 70°C
A
–40°C ≤ T ≤ 85°C
A
l
l
V
V
Output Voltage Swing Low
V = 3V, No Load
3
10
mV
mV
OL
S
V = 3V, I
= 5mA
250
450
S
SINK
l
l
V = 5V, No Load
3
250
330
10
500
500
mV
mV
mV
S
S
V = 5V, I
= 5mA
= 10mA
SINK
SINK
V = 5V, I
S
l
l
Output Voltage Swing High
V = 3V, No Load
2.95
2.55
2.978
2.6
V
V
OH
S
V = 3V, I
= 5mA
S
SOURCE
l
l
V = 5V, No Load
4.95
4.30
4.978
4.6
V
V
S
V = 5V, I
= 10mA
S
SOURCE
I
Short-Circuit Current (Note 2)
V = 3V, Short to GND
10
10
15
30
mA
mA
SC
S
V = 3V, Short to V
S
CC
V = 5V, Short to GND
15
15
25
30
mA
mA
S
V = 5V, Short to V
S
CC
14901afd
4
LT1490A/LT1491A
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating
temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply
unless otherwise noted. (Note 4)
LT1490AC/LT1491AC
LT1490AI/LT1491AI
SYMBOL
PARAMETER
CONDITIONS
V = 2.5V to 12.5V, V = V = 1V
MIN
TYP
98
2
MAX
UNITS
l
l
l
PSRR
Power Supply Rejection Ratio
Minimum Operating Supply Voltage
Reverse Supply Voltage
84
dB
V
S
CM
O
2.5
I = –100μA per Amplifier
S
18
27
40
V
I
Supply Current per Amplifier
(Note 7)
50
55
μA
μA
S
l
GBW
SR
Gain Bandwidth Product
(Note 6)
f = 1kHz
110
100
90
180
kHz
kHz
kHz
l
l
0°C ≤ T ≤ 70°C
A
–40°C ≤ T ≤ 85°C
A
Slew Rate
(Note 8)
A = –1, R = ∞
0.035
0.031
0.030
0.06
V/μs
V/μs
V/μs
V
L
l
l
0°C ≤ T ≤ 70°C
A
–40°C ≤ T ≤ 85°C
A
The ● denotes specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifications are
at TA = 25°C. VS = 15V, VCM = 0V, VOUT = 0V unless otherwise noted. (Note 4)
LT1490AC/LT1491AC
LT1490AI/LT1491AI
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage (Note 5)
LT1490A N, S Packages
150
700
950
1100
μV
μV
μV
OS
l
l
0°C ≤ T ≤ 70°C
A
–40°C ≤ T ≤ 85°C
A
LT1490A MS8 Package, LT1491A N, S Packages
250
285
1200
1350
1500
μV
μV
μV
l
l
0°C ≤ T ≤ 70°C
A
–40°C ≤ T ≤ 85°C
A
LT1490A DD, LT1491A DHC
1400
1550
1700
μV
μV
μV
l
l
0°C ≤ T ≤ 70°C
A
–40°C ≤ T ≤ 85°C
A
l
l
Input Offset Voltage Drift (Note 9)
–40°C ≤ T ≤ 85°C
2
2
6
7
μV/°C
μV/°C
A
LT1490A DD, LT1491A DHC, –40°C ≤ T ≤ 85°C
A
l
l
l
I
I
Input Offset Current
Input Bias Current
0.2
1
0.8
8
nA
nA
OS
B
Input Bias Current Drift
Input Noise Voltage
–40°C ≤ T ≤ 85°C
5
pA/°C
A
0.1Hz to 10Hz
f = 1kHz
1
μV
P-P
e
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
50
0.015
nV/√Hz
pA/√Hz
n
i
f = 1kHz
n
R
Differential
6
17
15000
Mꢀ
Mꢀ
IN
Common Mode, V = –15V to 14V
CM
C
Input Capacitance
4.6
pF
V
IN
l
l
Input Voltage Range
–15
80
29
CMRR
Common Mode Rejection Ratio
Large-Signal Voltage Gain
V
= –15V to 29V
98
dB
CM
A
VOL
V = 14V, R = 10k
100
75
50
250
V/mV
V/mV
V/mV
O
L
l
l
0°C ≤ T ≤ 70°C
A
–40°C ≤ T ≤ 85°C
A
l
l
V
O
Output Voltage Swing
No Load
14.9
14.5
14.5
14.978
14.750
14.670
V
V
V
I
I
=
=
5mA
OUT
OUT
10mA
14901afd
5
LT1490A/LT1491A
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature
range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = 15V, VCM = 0V, VOUT = 0V unless otherwise noted. (Note 4)
LT1490AC/LT1491AC
LT1490AI/LT1491AI
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
I
Short-Circuit Current (Note 2)
Short to GND
20
15
10
25
mA
mA
mA
SC
0°C ≤ T ≤ 70°C
A
–40°C ≤ T ≤ 85°C
A
l
l
PSRR
Power Supply Rejection Ratio
Supply Current per Amplifier
V = 1.25V to 22V
S
88
98
50
dB
I
70
85
μA
μA
S
GBW
SR
Gain Bandwidth Product
Slew Rate
f = 1kHz
125
110
100
200
kHz
kHz
kHz
l
l
0°C ≤ T ≤ 70°C
A
–40°C ≤ T ≤ 85°C
A
A = –1, RL = ∞, V = 10V,
0.0375
0.07
V/μs
V
O
Measured at V = 5V
O
l
l
0°C ≤ T ≤ 70°C
0.0330
0.0300
V/μs
V/μs
A
–40°C ≤ T ≤ 85°C
A
The ● denotes specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 125°C, VS = 3V, 0V; VS = 5V, 0V;
VCM = VOUT = half supply unless otherwise noted. (Note 4)
LT1490AH/LT1491AH
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
Input Offset Voltage (Note 5)
LT1490AHS8
110
500
2500
μV
μV
OS
l
LT1490AHMS8, LT1491AHS
220
3
1000
3000
μV
μV
l
l
Input Offset Voltage Drift (Note 9)
Input Offset Current
6
μV/°C
l
l
I
I
2
nA
μA
OS
V
V
= 44V (Note 6)
= 44V (Note 6)
1.5
CM
CM
l
l
Input Bias Current
20
15
nA
μA
B
l
Input Voltage Range
0.3
44
V
l
l
CMRR
Common Mode Rejection Ratio
(Note 6)
V
CM
V
CM
= 0.3V to V –1V
60
74
dB
dB
CC
= 0.3V to 44V
A
V
V
Large-Signal Voltage Gain
Output Voltage Swing Low
Output Voltage Swing High
V = 3V, V = 500mV to 2.5V, R = 10k
200
25
1500
1500
V/mV
V/mV
VOL
S
O
L
l
l
V = 5V, V = 500mV to 4.5V, R = 10k
400
50
V/mV
V/mV
S
O
L
l
l
V = 3V, No Load
15
mV
mV
OL
S
S
V = 3V, I
= 2.5mA
450
SINK
l
l
V = 5V, No Load
15
500
mV
mV
S
S
V = 5V, I
= 2.5mA
SINK
l
l
V = 3V, No Load
2.925
2.350
V
V
OH
S
V = 3V, I
= 5mA
S
SOURCE
l
l
V = 5V, No Load
4.925
4.100
V
V
S
V = 5V, I
= 10mA
S
SOURCE
l
l
l
PSRR
Power Supply Rejection Ratio
Minimum Operating Supply Voltage
Reverse Supply Voltage
V = 2.5V to 12.5V, V = V = 1V
80
dB
V
S
CM
O
2.5
I = –100μA per Amplifier
S
18
V
14901afd
6
LT1490A/LT1491A
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature
range of –40°C ≤ TA ≤ 125°C. VS = 15V, VCM = 0V, VOUT = 0V unless otherwise noted. (Note 4)
LT1490AH/LT1491AH
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
I
Supply Current per Amplifier (Note 7)
40
50
70
μA
μA
S
l
l
l
l
GBW
SR
Gain Bandwidth Product (Note 6)
Slew Rate (Note 8)
f = 1kHz
110
60
180
0.06
150
250
3
kHz
kHz
A = –1, R = ∞
V
0.035
0.015
V/μs
V/μs
L
V
Input Offset Voltage (Note 5)
LT1490AHS8
700
2700
μV
μV
OS
LT1490AHMS8, LT1491AHS
1200
3200
μV
μV
l
l
l
l
l
l
Input Offset Voltage Drift (Note 9)
Input Offset Current
7
2
μV/°C
nA
I
I
OS
Input Bias Current
20
29
nA
B
Input Voltage Range
–14.7
72
V
CMRR
Common Mode Rejection Ratio
Large-Signal Voltage Gain
V
= –14.7V to 29V
dB
CM
A
V = 14V, R = 10k
O
100
4
250
V/mV
V/mV
VOL
L
l
l
l
V
O
Output Voltage Swing
No Load
OUT
14.8
14.3
V
V
I
= 2.5mA
l
l
l
l
PSRR
Power Supply Rejection Ratio
Supply Current per Amplifier
V = 1.25V to 22V
84
dB
S
I
50
70
95
μA
μA
S
GBW
SR
Gain Bandwidth Product
Slew Rate
f = 1kHz
125
75
200
0.07
kHz
kHz
A = –1, R = ∞
0.0375
0.02
V/μs
V/μs
V
L
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 5: ESD (electrostatic discharge) sensitive device. Extensive use
of ESD protection devices are used internal to the LT1490A/LT1491A.
However, high electrostatic discharge can damage or degrade the device.
Use proper ESD handling precautions.
Note 2: A heat sink may be required to keep the junction temperature
below absolute maximum. This depends on the power supply voltage and
Note 6: V = 5V limits are guaranteed by correlation to V = 3V and
S
S
V = 15V tests.
S
how many amplifiers are shorted. The θ specified for the DD and DHC
JA
Note 7: V = 3V limits are guaranteed by correlation to V = 5V and
S
S
package is with minimal PCB heat spreading metal. Using expanded metal
area on all layers of a board reduces this value.
V = 15V tests.
S
Note 8: Guaranteed by correlation to slew rate at V = 15V and GBꢀ
S
Note 3: The LT1490AC/LT1491AC and LT1490AI/LT1491AI are guaranteed
functional over the operating temperature range of –40°C to 85°C.
The LT1490AH/LT1491AH are guaranteed functional over the operating
temperature range of –40°C to 125°C.
at V = 3V and V = 15V tests.
S
S
Note 9: This parameter is not 100% tested.
Note 4: The LT1490AC/LT1491AC are guaranteed to meet specified
performance from 0°C to 70°C. The LT1490AC/LT1491AC 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 LT1490AI/LT1491AI are guaranteed to meet specified performance
from –40°C to 85°C. The LT1490AH/LT1491AH are guaranteed to meet
specified performance from –40°C to 125°C.
14901afd
7
LT1490A/LT1491A
TYPICAL PERFORMANCE CHARACTERISTICS
Input Bias Current
Supply Current vs Supply Voltage
Minimum Supply Voltage
vs Common Mode Voltage
80
70
60
50
40
30
20
10
0
5000
3000
1000
400
300
V
= 5V, 0V
S
T
= 125°C
A
T
200
100
= 25°C
A
T
= –55°C
T = –55°C
A
A
T
= 25°C
A
30
20
0
T
= 25°C
A
T
= –55°C
A
–100
T
= 125°C
A
10
–200
–300
0
T
= 125°C
1
A
–10
–400
0
5
10 15 20 25 30 35 40 45
TOTAL SUPPLY VOLTAGE (V)
–0.4
0 4.0 4.4 4.8 5.2 5.6
COMMON MODE VOLTAGE (V)
44
0
2
3
4
5
TOTAL SUPPLY VOLTAGE (V)
1490A G01
1490A G03
1490A G02
Output Saturation Voltage
vs Load Current (Output High)
Output Saturation Voltage
vs Load Current (Output Low)
Output Saturation Voltage
vs Input Overdrive
1
1
100m
10m
1m
100
90
80
70
60
50
40
30
20
10
0
V
= 5V, 0V
V
= 5V, 0V
V
= 5V, 0V
S
S
S
NO LOAD
T
= 125°C
A
T
= 125°C
A
T
= 25°C
A
100m
T
= 25°C
A
T
= –55°C
A
OUTPUT HIGH
OUTPUT LOW
T
= –55°C
1m
A
10m
1μ
10μ
100μ
10m
100m
0.1μ
1μ
10μ 100μ 1m
10m 100m
0
10
30
INPUT OVERDRIVE (mV)
40
50
20
SINKING LOAD CURRENT (A)
SOURCING LOAD CURRENT (A)
1490A G04
1490A G05
1490A G06
Noise Voltage Density
vs Frequency
0.1Hz to 10Hz Noise Voltage
Input Noise Current vs Frequency
120
100
80
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
V
= 2.5V
S
60
40
20
0
1
2
3
4
5
6
7
8
9
10
1
10
100
1k
1
10
100
1k
TIME (SEC)
FREQUENCY (Hz)
FREQUENCY (Hz)
1490A G08
1490A G09
1490A G07
14901afd
8
LT1490A/LT1491A
TYPICAL PERFORMANCE CHARACTERISTICS
Gain and Phase Shift
vs Frequency
Gain Bandwidth Product
vs Temperature
Slew Rate vs Temperature
70
60
50
40
100
80
0.12
260
240
220
200
180
160
140
120
100
V
= 2.5V
f = 1kHz
S
RISING, V
RISING, V
=
15V
60
S
S
PHASE
0.10
0.08
0.06
0.04
40
30
20
20
0
V
= 15V
S
=
S
1.5V
GAIN
FALLING, V
=
=
15V
1.5V
V
= 1.5V
S
10
0
–20
–40
–60
–80
–100
FALLING, V
S
–10
–20
–30
1
10
100
1000
50
TEMPERATURE (°C)
125
50
TEMPERATURE (°C)
125
–50
0
25
75 100
–50
0
25
75 100
–25
–25
FREQUENCY (kHz)
1490A G10
1490A G11
1490A G12
Gain Bandwidth Product and
Phase Margin vs Supply Voltage
CMRR vs Frequency
PSRR vs Frequency
250
240
230
220
210
200
190
180
170
160
150
60
120
80
70
V
= 2.5V
S
PHASE MARGIN
60
50
100
80
60
40
20
50
40
30
20
10
V
=
15V
POSITIVE SUPPLY
S
40
V
= 1.5V
S
30
GAIN BANDWIDTH
20
NEGATIVE SUPPLY
10
0
–10
–20
R
= 10k
L
f = 1kHz
1
10
FREQUENCY (kHz)
100
1
10
FREQUENCY (kHz)
100
0
5
10 15 20 25 30 35 40 45
TOTAL SUPPLY VOLTAGE (V)
1490A G15
1490A G14
1490A G13
Gain Bandwidth Product and
Phase Margin vs Load Resistance
Channel Separation vs Frequency
Output Impedance vs Frequency
130
350
300
250
200
150
100
50
80
10k
1k
V
= 15V
V
= 2.5V
V
A
=
2.5V
= –1
= R = 100k 70
S
S
S
V
F
120
110
100
90
R
G
f = 1kHz
A
A
= 100
= 10
V
V
PHASE MARGIN
60
50
40
30
20
100
10
80
GAIN BANDWIDTH
70
A
= 1
V
60
1
50
40
0.1
0.1
1
10
100
1
10
LOAD RESISTANCE (kΩ)
100
0.1
1
10
100
FREQUENCY (kHz)
FREQUENCY (kHz)
1490A G17
1490A G16
1490A G18
14901afd
9
LT1490A/LT1491A
TYPICAL PERFORMANCE CHARACTERISTICS
Undistorted Output Swing
vs Frequency
Settling Time to 0.1%
vs Output Step
Capacitive Load Handling,
Overshoot vs Capacitive Load
10
8
100
90
80
70
60
50
40
30
20
10
0
35
30
25
20
15
10
5
V
=
15V
V = 5V, 0V
S
DISTORTION ≤ 1%
S
V
= 15V
S
I
= 170μA
SOURCE
A
= –1
V
6
A
= 1
V
4
2
0
A
= 10
V
–2
–4
–6
–8
–10
A
V
= 1
A
= 2
A
V
= 5
V
V
= 5V, 0V
A
= –1
S
V
A
= 1
V
0
0
140
160
10
100
1000
10000
0.1
1
10
100
20 40 60 80 100 120
SETTLING TIME (μs)
CAPACITIVE LOAD (pF)
FREQUENCY (kHz)
1490A G21
1490A G19
1490A F20
Total Harmonic Distortion + Noise
vs Frequency
Total Harmonic Distortion + Noise
vs Load Resistance
Total Harmonic Distortion + Noise
vs Output Voltage
10
1
10
1
10
1
V
V
V
= 3V, 0V
V
A
V
= 3V TOTAL
= 1
R = 10k
L
S
S
V
= 2V
V
= HALF SUPPLY
CM
OUT
P-P
= 1.2V
= 2V AT 1kHz
f = 1kHz
CM
IN
P-P
R
L
= 50k
V
V
=
IN
1.5V
1V
S
=
A
V
= 1
=
V
S
A
S
= –1
1.5V
V
=
1.5V
V
0.1
0.1
0.1
V
V
= 3V, 0V
IN
S
= 0.5V TO 2.5V
A
S
= –1
0.01
0.001
0.01
0.01
V
A
= –1
V
V
= 3V, 0V
A
= 1
V
V
V
= 3V, 0V
IN
S
A
= 1
V
V
= 3V, 0V
S
= 0.2V TO 2.2V
0.001
0.001
0
1
2
3
0.01
0.1
1
10
0.1
1
10
100
OUTPUT VOLTAGE (V
)
P-P
FREQUENCY (kHz)
LOAD RESISTANCE TO GROUND (kΩ)
1490A G24
1490A G22
1490A G23
Open-Loop Gain
Large-Signal Response
Small-Signal Response
V
S
=
15V
R
= 2k
L
R
= 10k
L
R
L
= 50k
1491A G27
1491A G26
1490A G25
V
A
=
= 1
15V
–10V
0V
10V
V
A
=
15V
S
V
S
V
= –1
OUTPUT VOLTAGE (5V/DIV)
14901afd
10
LT1490A/LT1491A
APPLICATIONS INFORMATION
Supply Voltage
The inputs are protected against excursions as much as
–
15V below V by an internal 1k resistor in series with
The positive supply pin of the LT1490A/LT1491A should
be bypassed with a small capacitor (about 0.01μF) within
an inch of the pin. When driving heavy loads an additional
4.7μF electrolytic capacitor should be used. When using
split supplies, the same is true for the negative supply pin.
each input and a diode from the input to the negative
supply. There is no output phase reversal for inputs up to
–
15V below V . There are no clamping diodes between the
inputs and the maximum differential input voltage is 44V.
TheLT1490A/LT1491Aareprotectedagainstreversebattery
voltages up to 18V. In the event a reverse battery condition
occurs, the supply current is less than 1nA.
Output
The output voltage swing of the LT1490A/LT1491A is
affected by input overdrive as shown in the typical per-
formance curves.
+
The LT1490A/LT1491A can be shut down by removing V .
Inthisconditiontheinputbiascurrentistypicallylessthan
0.5nA,eveniftheinputsare44Vabovethenegativesupply.
The output of the LT1490A/LT1491A can be pulled up to
+
18V beyond V with less than 1nA of leakage current,
+
WhenoperatingtheLT1490A/LT1491Aontotalsuppliesof
20V or more, the supply must not rise to its final voltage
in less than 1μs. This is especially true if low ESR bypass
capacitors are used. A series RLC circuit is formed from
the supply lead inductance and the bypass capacitor. A
resistance of 7.5Ω in the supply or in the bypass capacitor
will dampen the tuned circuit enough to limit the rise time.
provided that V is less than 0.5V.
The normally reverse-biased substrate diode from the
–
output to V will cause unlimited currents to flow when
–
the output is forced below V . If the current is transient
and limited to 100mA, no damage will occur.
TheLT1490A/LT1491Aareinternallycompensatedtodrive
at least 200pF of capacitance under any output loading
conditions.A0.22μFcapacitorinserieswitha150Ωresis-
tor between the output and ground will compensate these
amplifiers for larger capacitive loads, up to 10,000pF, at
all output currents.
Inputs
TheLT1490A/LT1491Ahavetwoinputstages,NPNandPNP
(see the Simplified Schematic), resulting in three distinct
operating regions as shown in the Input Bias Current vs
Common Mode typical performance curve.
Distortion
+
For input voltages about 0.8V or more below V , the PNP
Therearetwomaincontributorsofdistortioninopamps:
output crossover distortion as the output transitions
from sourcing to sinking current and distortion caused
by nonlinear common mode rejection. Of course, if the
op amp is operating inverting there is no common mode
induced distortion. When the LT1490A/LT1491A switch
between input stages there is significant nonlinearity in
the CMRR. Lower load resistance increases the output
crossover distortion, but has no effect on the input stage
transition distortion. For lowest distortion the LT1490A/
LT1491A should be operated single supply, with the out-
put always sourcing current and with the input voltage
input stage is active and the input bias current is typically
–1nA. When the input voltage is about 0.5V or less from
+
V , the NPN input stage is operating and the input bias
current is typically 25nA. Increases in temperature will
cause the voltage at which operation switches from the
+
PNP stage to the NPN stage to move towards V . The
input offset voltage of the NPN stage is untrimmed and
is typically 600μV.
A Schottky diode in the collector of each NPN transistor of
theNPNinputstageallowstheLT1490A/LT1491Atooperate
+
with either or both of their inputs above V . At about 0.3V
+
+
aboveV theNPNinputtransistorisfullysaturatedandthe
swing between ground and (V – 0.8V). See the Typical
input bias current is typically 3μA at room temperature.
The input offset voltage is typically 700μV when operating
Performance Characteristics curves.
+
above V . The LT1490A/LT1491A will operate with their
–
+
inputs 44V above V regardless of V .
14901afd
11
LT1490A/LT1491A
APPLICATIONS INFORMATION
Gain
in single supply applications where the load is returned
to ground. The typical performance photo of Open-Loop
Gain for various loads shows the details.
The open-loop gain is almost independent of load when
theoutputissourcingcurrent.Thisoptimizesperformance
TYPICAL APPLICATIONS
Square Wave Oscillator
Optional Output Compensation for
Capacitive Loads Greater Than 200pF
59k
5V
V
+
IN
100k
100k
1/2 LT1490A
+
C
≤ 10,000pF
L
–
1/2 LT1490A
V
OUT
–
R
50k
0.22μF
150Ω
C
0.1μF
1490A TA02
1490A TA04
1
2RC
f =
V
OUT
= 5V WITH 5V SUPPLY
P-P
I
= 200μA
S
AT V = 5V, R = 50k, C = 1nF
S
OUTPUT IS 5kHz SLEW LIMITED TRIANGLE WAVE
SIMPLIFIED SCHEMATIC
+
V
Q2
Q1
Q3
Q22
D1
D2
D3
R1
30k
R2
1k
Q19
Q4
–IN
+IN
Q17
Q18
Q20
OUT
Q7
Q8
Q11 Q12
R3
1k
+
Q16
2μA
Q15
Q9
Q10
Q13
Q14
Q21
R4
40k
R5
40k
Q5
Q6
D4
D5
–
V
ONE AMPLIFIER
1490A SS
14901afd
12
LT1490A/LT1491A
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
DD Package
8-Lead Plastic DFN (3mm w 3mm)
(Reference LTC DWG # 05-08-1698 Rev C)
R = 0.125
0.40 t 0.10
TYP
5
8
0.70 t0.05
3.5 t0.05
2.10 t0.05 (2 SIDES)
1.65 t0.05
3.00 t0.10
(4 SIDES)
1.65 t 0.10
(2 SIDES)
PIN 1
TOP MARK
(NOTE 6)
PACKAGE
OUTLINE
(DD8) DFN 0509 REV C
4
1
0.25 t 0.05
0.75 t0.05
0.200 REF
0.25 t 0.05
0.50 BSC
0.50
BSC
2.38 t0.10
2.38 t0.05
BOTTOM VIEW—EXPOSED PAD
0.00 – 0.05
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
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
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660 Rev F)
3.00 t 0.102
(.118 t .004)
(NOTE 3)
0.52
(.0205)
REF
8
7 6 5
0.889 t 0.127
3.00 t 0.102
(.118 t .004)
(NOTE 4)
(.035 t .005)
DETAIL “A”
0.254
4.90 t 0.152
(.193 t .006)
(.010)
0s – 6s TYP
5.23
(.206)
MIN
GAUGE PLANE
3.20 – 3.45
(.126 – .136)
1
2
3
4
0.53 t 0.152
(.021 t .006)
1.10
(.043)
MAX
0.86
(.034)
REF
DETAIL “A”
0.65
(.0256)
BSC
0.42 t 0.038
0.18
(.007)
(.0165 t .0015)
TYP
SEATING
PLANE
RECOMMENDED SOLDER PAD LAYOUT
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
0.22 – 0.38
0.1016 t 0.0508
(.009 – .015)
(.004 t .002)
0.65
(.0256)
BSC
TYP
MSOP (MS8) 0307 REV F
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
14901afd
13
LT1490A/LT1491A
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
N Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510 Rev I)
.400*
(10.160)
MAX
.130 t .005
.300 – .325
.045 – .065
(3.302 t 0.127)
(1.143 – 1.651)
(7.620 – 8.255)
8
1
7
6
5
.065
(1.651)
TYP
.255 t .015*
(6.477 t 0.381)
.008 – .015
(0.203 – 0.381)
.120
.020
(0.508)
MIN
(3.048)
MIN
+.035
–.015
2
4
3
.325
.018 t .003
(0.457 t 0.076)
.100
(2.54)
BSC
N8 REV I 0711
+0.889
8.255
ꢀ
ꢁ
–0.381
NOTE:
INCHES
1. DIMENSIONS ARE
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.189 – .197
(4.801 – 5.004)
.045 p.005
NOTE 3
.050 BSC
7
5
8
6
.245
MIN
.160 p.005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.030 p.005
TYP
1
3
4
2
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
(0.254 – 0.508)
s 45o
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
.008 – .010
(0.203 – 0.254)
0o– 8o TYP
.016 – .050
(0.406 – 1.270)
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
NOTE:
INCHES
1. DIMENSIONS IN
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
SO8 0303
14901afd
14
LT1490A/LT1491A
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
N Package
14-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510 Rev I)
.770ꢀ
(19.558)
MAX
14
13
12
11
10
9
8
7
.255 .015ꢀ
(6.477 0.381)
1
2
3
5
6
4
.300 – .325
(7.620 – 8.255)
.045 – .065
(1.143 – 1.651)
.130 .005
(3.302 0.127)
.020
(0.508)
MIN
.065
(1.651)
TYP
.008 – .015
(0.203 – 0.381)
+.035
.325
.005
(0.127)
MIN
–.015
.120
(3.048)
MIN
.018 .003
.100
(2.54)
BSC
+0.889
8.255
(0.457 0.076)
ꢀ
ꢁ
–0.381
N14 REV I 0711
NOTE:
INCHES
MILLIMETERS
1. DIMENSIONS ARE
ꢀTHESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
S Package
14-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.337 – .344
.045 .005
(8.560 – 8.738)
.050 BSC
NOTE 3
13
12
11
10
9
8
14
N
N
1
.245
MIN
.160 .005
.150 – .157
.228 – .244
(5.791 – 6.197)
(3.810 – 3.988)
NOTE 3
2
3
N/2
N/2
7
.030 .005
TYP
RECOMMENDED SOLDER PAD LAYOUT
1
2
3
4
5
6
.010 – .020
(0.254 – 0.508)
w 45
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
.008 – .010
(0.203 – 0.254)
0° – 8° TYP
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
.016 – .050
(0.406 – 1.270)
S14 0502
NOTE:
INCHES
(MILLIMETERS)
2. DRAWING NOT TO SCALE
1. DIMENSIONS IN
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
14901afd
15
LT1490A/LT1491A
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
DHC Package
16-Lead Plastic DFN (5mm × 3mm)
(Reference LTC DWG # 05-08-1706)
0.65 p0.05
3.50 p0.05
1.65 p0.05
2.20 p0.05 (2 SIDES)
PACKAGE
OUTLINE
0.25 p 0.05
0.50 BSC
4.40 p0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
R = 0.115
TYP
0.40 p 0.10
5.00 p0.10
(2 SIDES)
9
16
R = 0.20
TYP
3.00 p0.10 1.65 p 0.10
(2 SIDES)
(2 SIDES)
PIN 1
TOP MARK
(SEE NOTE 6)
PIN 1
NOTCH
(DHC16) DFN 1103
8
1
0.25 p 0.05
0.75 p0.05
0.200 REF
0.50 BSC
4.40 p0.10
(2 SIDES)
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING PROPOSED TO BE MADE VARIATION OF VERSION (WJED-1) IN JEDEC
PACKAGE OUTLINE MO-229
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
14901afd
16
LT1490A/LT1491A
REVISION HISTORY (Revision history begins at Rev C)
REV
DATE
DESCRIPTION
PAGE NUMBER
C
10/10 Changed units from mV to V for V in Electrical Characteristics
7
13-16
3
O
Updated package drawings
D
12/11 Revised Order Information
14901afd
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.
17
LT1490A/LT1491A
TYPICAL APPLICATION
Ring-Tone Generator
60V
R16
100k
R2
47k
Q1
R3
R5
IRF628
R6
Q3
2N3904
10k
100k
10k
C3
C2
0.047μF
0.47μF
R17
620Ω
Z1
15V
100k
5
R9
300k
R11
+
10k
10
9
3
2
7
D1
1N4148
1/4 LT1491A
+
+
1
6
8
R1
33k
1/4 LT1491A
1/4 LT1491A
–
4
13
12
R7
16k
–
C4
0.068μF
–
–
14
R18
100Ω
1/4 LT1491A
+
C7
47μF
R26
2k
R24
420
R23
4.7k
R12
10k
R14
10k
R4
1.6M
R8
620k
C1
1μF
11
R10
620k
SMOOTHING FILTER
OPTO1*
R25
4.7k
R13
130k
R15
47k
C5
0.01μF
CADENCE OSCILLATOR
20Hz OSCILLATOR
Q5
2N3904
UP TO
LOAD TEN
PHONES
Z2
15V
R19
620Ω
Q4
2N3906
Q2
IRF9620
R21
150Ω
C6
0.033μF
1490A TA03
*LED OF OPTO1 ILLUMINATES WHEN THE PHONE IS OFF THE HOOK
SEE DESIGN NOTE DN134 FOR A DISCUSSION OF THE CIRCUIT
POWER AMPLIFIER
R20
100k
–180V
RELATED PARTS
PART NUMBER
LT1366/LT1367
LT1636
DESCRIPTION
COMMENTS
Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps
475μV V
, 500V/mV A
, 400kHz GBW
OS(MAX)
VOL(MIN)
Single Over-The-Top Micropower Rail-to-Rail Input and Output 55μA Supply Current, V Extends 44V Above V
Op Amp
,
EE
CM
Independent of V , MSOP Package, Shutdown Function
CC
LT1638/LT1639
LT1782
Dual/Quad 1.2MHz Over-The-Top Micropower, Rail-to-Rail
Input and Output Op Amps
0.4V/μs Slew Rate, 230μA Supply Current per Amplifier
Micropower, Over-The-Top, SOT-23, Rail-to-Rail Input and
Output Op Amp
SOT-23, 800μV V , I = 55μA (Max),
OS(MAX) S
Gain-Bandwidth = 200kHz, Shutdown Pin
LT1783
1.2MHz, Over-The-Top, Micropower, Rail-to-Rail Input and
Output Op Amp
SOT-23, 800μV V , I = 300μA (Max),
OS(MAX)
S
Gain-Bandwidth = 1.2MHz, Shutdown Pin
14901afd
LT 1211 REV D • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
18
●
●
© LINEAR TECHNOLOGY CORPORATION 2011
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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