Precision Low Noise, Low Input
Bias Current Operational Amplifiers
OP1177/OP2177/OP4177
Data Sheet
PIN CONFIGURATIONS
NC 1
5
NC = NO CONNECT
7 V+
OP1177
6 OUT
V– 4
5 NC
NC = NO CONNECT
Figure 1. 8-Lead MSOP (RM Suffix)
Figure 2. 8-Lead SOIC_N (R Suffix)
OUT A 1
1
8
V+
OUT B
–IN B
+IN B
OP2177
4
5
–IN A 2
Figure 3. 8-Lead MSOP (RM Suffix)
OUT A 1
14 OUT D
–IN A 2
13 –IN D
V+ 4
+IN B 5
OP4177
+IN A 3
8 V+
OP2177
7 OUT B
6 –IN B
5 +IN B
V– 4
Figure 4. 8-Lead SOIC_N (R Suffix)
12 +IN D
11 V–
10 +IN C
–IN B 6
9
–IN C
OUT B 7
8
OUT C
02627-005
+IN A 3
02627-002
4
+IN 3
8 NC
02627-004
Wireless base station control circuits
Optical network control circuits
Instrumentation
Sensors and controls
Thermocouples
Resistor thermal detectors (RTDs)
Strain bridges
Shunt current measurements
Precision filters
NC
V+
OUT
NC
OP1177
OUT A
–IN A
+IN A
V–
APPLICATIONS
8
02627-001
1
NC
–IN
+IN
V–
–IN 2
02627-003
Low offset voltage: 60 μV maximum
Very low offset voltage drift: 0.7 μV/°C maximum
Low input bias current: 2 nA maximum
Low noise: 8 nV/√Hz typical
CMRR, PSRR, and AVO > 120 dB minimum
Low supply current: 400 μA per amplifier
Dual supply operation: ±2.5 V to ±15 V
Unity-gain stable
No phase reversal
Inputs internally protected beyond supply voltage
Figure 5. 14-Lead SOIC_N (R Suffix)
OUT A
–IN A
+IN A
V+
+IN B
–IN B
OUT B
1
14
OP4177
7
8
OUT D
–IN D
+IN D
V–
+IN C
–IN C
OUT C
02627-006
FEATURES
Figure 6. 14-Lead TSSOP (RU Suffix)
GENERAL DESCRIPTION
The OPx177 family consists of very high precision, single, dual,
and quad amplifiers featuring extremely low offset voltage and
drift, low input bias current, low noise, and low power consumption. Outputs are stable with capacitive loads of over 1000 pF
with no external compensation. Supply current is less than 500 μA
per amplifier at 30 V. Internal 500 Ω series resistors protect the
inputs, allowing input signal levels several volts beyond either
supply without phase reversal.
Unlike previous high voltage amplifiers with very low offset
voltages, the OP1177 (single) and OP2177 (dual) amplifiers
are available in tiny 8-lead surface-mount MSOP and 8-lead
narrow SOIC packages. The OP4177 (quad) is available in
TSSOP and 14-lead narrow SOIC packages. Moreover, specified
performance in the MSOP and the TSSOP is identical to
Rev. I
performance in the SOIC package. MSOP and TSSOP are
available in tape and reel only.
The OPx177 family offers the widest specified temperature
range of any high precision amplifier in surface-mount packaging.
All versions are fully specified for operation from −40°C to
+125°C for the most demanding operating environments.
Applications for these amplifiers include precision diode
power measurement, voltage and current level setting, and
level detection in optical and wireless transmission systems.
Additional applications include line-powered and portable
instrumentation and controls—thermocouple, RTD,
strain-bridge, and other sensor signal conditioning—and
precision filters.
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Tel: 781.329.4700 ©2001–2020 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
OP1177/OP2177/OP4177
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Overload Recovery Time .......................................................... 15
Applications ...................................................................................... 1
THD + Noise .............................................................................. 16
Pin Configurations ........................................................................... 1
Capacitive Load Drive ............................................................... 16
General Description ......................................................................... 1
Stray Input Capacitance Compensation ................................. 17
Revision History ............................................................................... 2
Reducing Electromagnetic Interference ................................. 17
Specifications .................................................................................... 3
Proper Board Layout ................................................................. 18
Electrical Characteristics ............................................................. 3
Difference Amplifiers ................................................................ 18
Electrical Characteristics ............................................................. 4
A High Accuracy Thermocouple Amplifier ........................... 19
Absolute Maximum Ratings ........................................................... 5
Low Power Linearized RTD ..................................................... 19
Thermal Resistance ...................................................................... 5
Single Operational Amplifier Bridge ....................................... 20
ESD Caution.................................................................................. 5
Realization of Active Filters .......................................................... 21
Typical Performance Characteristics ............................................. 6
Band-Pass KRC or Sallen-Key Filter ....................................... 21
Functional Description .................................................................. 14
Channel Separation.................................................................... 21
Total Noise-Including Source Resistors.................................. 14
References on Noise Dynamics and Flicker Noise ............... 21
Gain Linearity ............................................................................. 14
Outline Dimensions ....................................................................... 22
Input Overvoltage Protection ................................................... 15
Ordering Guide .......................................................................... 24
Output Phase Reversal ............................................................... 15
Settling Time ............................................................................... 15
REVISION HISTORY
8/2020—Rev. H to Rev. I
Changes to Ordering Guide .......................................................... 24
9/2018—Rev. G to Rev. H
Changes to Ordering Guide .......................................................... 24
11/2009—Rev. F to Rev. G
Changes to Figure 64 ..................................................................... 19
Changes to Ordering Guide .......................................................... 24
Updated Outline Dimensions ....................................................... 22
5/2009—Rev. E to Rev. F
Changes to Figure 64 ..................................................................... 19
Changes to Ordering Guide .......................................................... 24
10/2007—Rev. D to Rev. E
Changes to General Description .................................................... 1
Changes to Table 4 ........................................................................... 5
Updated Outline Dimensions ....................................................... 22
7/2006—Rev. C to Rev. D
Changes to Table 4 ........................................................................... 5
Changes to Figure 51 ..................................................................... 14
Changes to Figure 52 ..................................................................... 15
Changes to Figure 54 ..................................................................... 16
Changes to Figure 58 to Figure 61 ............................................... 17
Changes to Figure 62 and Figure 63 ............................................ 18
Changes to Figure 64 ..................................................................... 19
Changes to Figure 65 and Figure 66 ............................................ 20
Changes to Figure 67 and Figure 68 ............................................ 21
Removed SPICE Model Section ................................................... 21
Updated Outline Dimensions ...................................................... 22
Changes to Ordering Guide .......................................................... 24
4/2004—Rev. B to Rev. C
Changes to Ordering Guide .............................................................4
Changes to TPC 6 ..............................................................................5
Changes to TPC 26............................................................................7
Updated Outline Dimensions ...................................................... 17
4/2002—Rev. A to Rev. B
Added OP4177......................................................................... Global
Edits to Specifications .......................................................................2
Edits to Electrical Characteristics Headings ..................................4
Edits to Ordering Guide ...................................................................4
11/2001—Rev. 0 to Rev. A
Edit to Features ..................................................................................1
Edits to TPC 6 ...................................................................................5
7/2001—Revision 0: Initial Version
Rev. I | Page 2 of 24
Data Sheet
OP1177/OP2177/OP4177
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
VS = ±5.0 V, VCM = 0 V, TA = 25°C, unless otherwise noted.
Table 1.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
OP1177
OP2177/OP4177
OP1177/OP2177
OP4177
Input Bias Current
Input Offset Current
Input Voltage Range
Common-Mode Rejection Ratio
Large Signal Voltage Gain
Offset Voltage Drift
OP1177/OP2177
OP4177
OUTPUT CHARACTERISTICS
Output Voltage High
Output Voltage Low
Output Current
POWER SUPPLY
Power Supply Rejection Ratio
OP1177
OP2177/OP4177
Supply Current per Amplifier
DYNAMIC PERFORMANCE
Slew Rate
Gain Bandwidth Product
NOISE PERFORMANCE
Voltage Noise
Voltage Noise Density
Current Noise Density
MULTIPLE AMPLIFIERS CHANNEL SEPARATION
1
Symbol
VOS
VOS
VOS
VOS
IB
IOS
CMRR
Test Conditions/Comments
−40°C < TA < +125°C
−40°C < TA < +125°C
−40°C < TA < +125°C
−40°C < TA < +125°C
Min
−2
−1
−3.5
120
118
1000
AVO
VCM = −3.5 V to +3.5 V
−40°C < TA < +125°C
RL = 2 kΩ, VO = −3.5 V to +3.5 V
ΔVOS/ΔT
ΔVOS/ΔT
−40°C < TA < +125°C
−40°C < TA < +125°C
VOH
VOL
IOUT
IL = 1 mA, −40°C < TA < +125°C
IL = 1 mA, −40°C < TA < +125°C
VDROPOUT < 1.2 V
+4
PSRR
VS = ±2.5 V to ±15 V
−40°C < TA < +125°C
VS = ±2.5 V to ±15 V
−40°C < TA < +125°C
VO = 0 V
−40°C < TA < +125°C
120
115
118
114
PSRR
ISY
Typ1
Max
Unit
15
15
25
25
+0.5
+0.2
60
75
100
120
+2
+1
+3.5
μV
μV
μV
μV
nA
nA
V
dB
dB
V/mV
0.2
0.3
0.7
0.9
μV/°C
μV/°C
+4.1
−4.1
±10
−4
V
V
mA
126
125
2000
130
125
121
120
400
500
SR
GBP
RL = 2 kΩ
0.7
1.3
en p-p
en
in
CS
0.1 Hz to 10 Hz
f = 1 kHz
f = 1 kHz
DC
f = 100 kHz
0.4
7.9
0.2
0.01
−120
500
600
dB
dB
dB
dB
μA
μA
V/μs
MHz
8.5
μV p-p
nV/√Hz
pA/√Hz
μV/V
dB
Typical values cover all parts within one standard deviation of the average value. Average values given in many competitor data sheets as typical give unrealistically
low estimates for parameters that can have both positive and negative values.
Rev. I | Page 3 of 24
OP1177/OP2177/OP4177
Data Sheet
ELECTRICAL CHARACTERISTICS
VS = ±15 V, VCM = 0 V, TA = 25°C, unless otherwise noted.
Table 2.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
OP1177
OP2177/OP4177
OP1177/OP2177
OP4177
Input Bias Current
Input Offset Current
Input Voltage Range
Common-Mode Rejection Ratio
Large Signal Voltage Gain
Offset Voltage Drift
OP1177/OP2177
OP4177
OUTPUT CHARACTERISTICS
Output Voltage High
Output Voltage Low
Output Current
Short-Circuit Current
POWER SUPPLY
Power Supply Rejection Ratio
OP1177
OP2177/OP4177
Supply Current per Amplifier
DYNAMIC PERFORMANCE
Slew Rate
Gain Bandwidth Product
NOISE PERFORMANCE
Voltage Noise
Voltage Noise Density
Current Noise Density
MULTIPLE AMPLIFIERS CHANNEL SEPARATION
1
Symbol
VOS
VOS
VOS
VOS
IB
IOS
CMRR
Conditions
−40°C < TA < +125°C
−40°C < TA < +125°C
−40°C < TA < +125°C
−40°C < TA < +125°C
Min
−2
−1
−13.5
AVO
VCM = −13.5 V to +13.5 V,
−40°C < TA < +125°C
RL = 2 kΩ, VO = –13.5 V to +13.5 V
ΔVOS/ΔT
ΔVOS/ΔT
−40°C < TA < +125°C
−40°C < TA < +125°C
VOH
VOL
IOUT
ISC
IL = 1 mA, −40°C < TA < +125°C
IL = 1 mA, −40°C < TA < +125°C
VDROPOUT < 1.2 V
+14
PSRR
VS = ±2.5 V to ±15 V
−40°C < TA < +125°C
VS = ±2.5 V to ±15 V
−40°C < TA < +125°C
VO = 0 V
−40°C < TA < +125°C
120
115
118
114
PSRR
ISY
120
1000
Typ1
Max
Unit
15
15
25
25
+0.5
+0.2
60
75
100
120
+2
+1
+13.5
μV
μV
μV
μV
nA
nA
V
125
3000
0.2
0.3
+14.1
−14.1
±10
±25
130
125
121
120
400
500
SR
GBP
RL = 2 kΩ
0.7
1.3
en p-p
en
in
CS
0.1 Hz to 10 Hz
f = 1 kHz
f = 1 kHz
DC
f = 100 kHz
0.4
7.9
0.2
0.01
−120
dB
V/mV
0.7
0.9
−14
500
600
μV/°C
μV/°C
V
V
mA
mA
dB
dB
dB
dB
μA
μA
V/μs
MHz
8.5
μV p-p
nV/√Hz
pA/√Hz
μV/V
dB
Typical values cover all parts within one standard deviation of the average value. Average values given in many competitor data sheets as typical give unrealistically
low estimates for parameters that can have both positive and negative values.
Rev. I | Page 4 of 24
Data Sheet
OP1177/OP2177/OP4177
ABSOLUTE MAXIMUM RATINGS
THERMAL RESISTANCE
Table 3.
Parameter
Supply Voltage
Input Voltage
Differential Input Voltage
Storage Temperature Range
R, RM, and RU Packages
Operating Temperature Range
OP1177/OP2177/OP4177
Junction Temperature Range
R, RM, and RU Packages
Lead Temperature, Soldering (10 sec)
Rating
36 V
VS− to VS+
±Supply Voltage
−65°C to +150°C
−40°C to +125°C
−65°C to +150°C
300°C
Stresses at or above those listed under Absolute Maximum
Ratings may cause permanent damage to the product. This is a
stress rating only; functional operation of the product at these
or any other conditions above those indicated in the
operational section of this specification is not implied.
Operation beyond the maximum operating conditions for
extended periods may affect product reliability.
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 4. Thermal Resistance
Package Type1
8-Lead MSOP (RM-8)
8-Lead SOIC_N (R-8)
14-Lead SOIC_N (R-14)
14-Lead TSSOP (RU-14)
1
θJA
190
158
120
240
MSOP is available in tape and reel only.
ESD CAUTION
Rev. I | Page 5 of 24
θJC
44
43
36
43
Unit
°C/W
°C/W
°C/W
°C/W
OP1177/OP2177/OP4177
Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
45
1.8
VSY = ±15V
1.6
ΔOUTPUT VOLTAGE (V)
1.4
35
30
25
20
15
1.2
1.0
0.8
0.4
5
0.2
0
–30
–40
–20
–10
0
10
20
INPUT OFFSETVOLTAGE (µV)
30
40
SOURCE
0.6
10
SINK
0
0.001
02627-007
NUMBER OF AMPLIFIERS
40
VSY = ±15V
TA = 25°C
Figure 7. Input Offset Voltage Distribution
0.01
0.1
LOAD CURRENT (mA)
1
10
02627-010
50
Figure 10. Output Voltage to Supply Rail vs. Load Current
3
90
VSY = ±15V
VSY = ±15V
80
70
INPUT BIAS CURRENT (nA)
NUMBER OF AMPLIFIERS
2
60
50
40
30
20
1
0
–1
–2
0.65
–3
–50
Figure 8. Input Offset Voltage Drift Distribution
100
50
120
OPEN-LOOP GAIN (dB)
100
80
60
40
VSY = ±15V
CL = 0
RL = ∞
225
180
40
135
30
GAIN
90
20
PHASE
10
–45
–10
0.2
0.3
0.4
0.5
INPUT BIAS CURRENT (nA)
0.6
0.7
–20
100k
02627-009
0.1
Figure 9. Input Bias Current Distribution
45
0
0
20
0
150
270
60
VSY = ±15V
NUMBER OF AMPLIFIERS
50
TEMPERATURE (°C)
Figure 11. Input Bias Current vs. Temperature
140
0
0
1M
FREQUENCY (Hz)
–90
10M
Figure 12. Open-Loop Gain and Phase Shift vs. Frequency
Rev. I | Page 6 of 24
PHASE SHIFT (Degrees)
0.15
0.25
0.35
0.45
0.55
INPUT OFFSET VOLTAGE DRIFT (µV/°C)
02627-012
0.05
02627-008
0
02627-011
10
Data Sheet
OP1177/OP2177/OP4177
120
VOLTAGE (100mV/DIV)
80
CLOSED-LOOP GAIN (dB)
VSY = ±15V
CL = 1,000pF
RL = 2kΩ
VIN = 100mV
AV = 1
VSY = ±15V
VIN = 4mV p-p
CL = 0
RL = ∞
100
60
AV = 100
40
AV = 10
20
0
AV = 1
–20
GND
–40
10k
100k
1M
FREQUENCY (Hz)
10M
100M
TIME (100µs/DIV)
Figure 16. Small Signal Transient Response
Figure 13. Closed-Loop Gain vs. Frequency
50
500
VSY = ±15V
VIN = 50mV p-p
OUTPUT IMPEDANCE (Ω)
400
350
300
AV = 10
AV = 1
250
AV = 100
200
VSY = ±15V
RL = 2kΩ
VIN = 100mV p-p
45
SMALL SIGNAL OVERSHOOT (%)
450
02627-016
1k
150
100
40
35
30
25
+OS
20
15
10
–OS
5
50
1k
10k
100k
FREQUENCY (Hz)
1M
0
02627-014
0
100
1
10
100
CAPACITANCE (pF)
1k
10k
02627-017
–80
02627-013
–60
Figure 17. Small Signal Overshoot vs. Load Capacitance
Figure 14. Output Impedance vs. Frequency
VSY = ±15V
CL = 300pF
RL = 2kΩ
VIN = 4V
AV = 1
VOLTAGE (1V/DIV)
0V
VSY = ±15V
RL = 10kΩ
AV = –100
VIN = 200mV
OUTPUT
–15V
+200mV
GND
INPUT
TIME (10µs/DIV)
Figure 18. Positive Overvoltage Recovery
Figure 15. Large Signal Transient Response
Rev. I | Page 7 of 24
02627-018
TIME (100µs/DIV)
02627-015
0V
OP1177/OP2177/OP4177
15V
Data Sheet
VSY = ±15V
OUTPUT
0V
VNOISE (0.2µV/DIV)
VSY = ±15V
RL = 10kΩ
AV = –100
VIN = 200mV
0V
TIME (4µs/DIV)
TIME (1s/DIV)
Figure 19. Negative Overvoltage Recovery
Figure 22. 0.1 Hz to 10 Hz Input Voltage Noise
18
140
VSY = ±15V
VSY = ±15V
VOLTAGE NOISE DENSITY (nV/√Hz)
120
80
60
40
20
16
14
12
10
8
6
100
1k
10k
100k
FREQUENCY (Hz)
1M
10M
2
02627-020
10
0
Figure 20. CMRR vs. Frequency
50
100
150
FREQUENCY (Hz)
200
Figure 23. Voltage Noise Density vs. Frequency
35
140
VSY = ±15V
VSY = ±15V
30
SHORT-CIRCUIT CURRENT (mA)
120
–PSRR
80
+PSRR
60
40
+ISC
25
–ISC
20
15
10
5
20
10
100
1k
10k
100k
FREQUENCY (Hz)
1M
10M
0
–50
02627-021
PSRR (dB)
100
0
250
02627-023
4
Figure 21. PSRR vs. Frequency
0
50
TEMPERATURE (°C)
100
Figure 24. Short-Circuit Current vs. Temperature
Rev. I | Page 8 of 24
150
02627-024
CMRR (dB)
100
0
02627-022
INPUT
02627-019
–200mV
Data Sheet
OP1177/OP2177/OP4177
14.40
133
VSY = ±15V
131
14.30
130
+VOH
14.25
CMRR (dB)
–VOL
14.20
14.15
129
128
127
126
14.10
125
14.05
50
TEMPERATURE (°C)
100
150
123
–50
02627-025
0
0
Figure 25. Output Voltage Swing vs. Temperature
131
0.2
130
0.1
129
0
–0.1
128
127
–0.2
126
–0.3
125
–0.4
124
20
40
60
80
100
120
TIME FROM POWER SUPPLY TURN-ON (Sec)
140
123
–50
0
Figure 26. Warm-Up Drift
100
150
Figure 29. PSRR vs. Temperature
18
50
VSY = ±15V
45
16
VSY = ±5V
40
NUMBER OF AMPLIFIERS
14
12
10
8
6
4
35
30
25
20
15
10
2
5
0
50
100
TEMPERATURE (°C)
150
0
02627-027
0
–50
50
TEMPERATURE (°C)
02627-029
PSRR (dB)
0.3
0
VSY = ±15V
132
02627-026
ΔOFFSET VOLTAGE (µV)
150
133
VSY = ±15V
0.4
INPUT OFFSET VOLTAGE (µV)
100
Figure 28. CMRR vs. Temperature
0.5
–0.5
50
TEMPERATURE (°C)
02627-028
124
14.00
–50
–40
Figure 27. Input Offset Voltage vs. Temperature
–30
–20
–10
0
10
20
INPUT OFFSET VOLTAGE (µV)
30
Figure 30. Input Offset Voltage Distribution
Rev. I | Page 9 of 24
40
02627-030
OUTPUT VOLTAGE SWING (V)
VSY = ±15V
132
14.35
OP1177/OP2177/OP4177
Data Sheet
500
1.4
1.2
VSY = ±5V
TA = 25°C
450
VSY = ±5V
VIN = 50mV p-p
OUTPUT IMPEDANCE (Ω)
0.8
SINK
0.6
SOURCE
0.4
350
300
250
200
150
AV = 10
100
0.2
0.1
1
LOAD CURRENT (mA)
10
0
100
02627-031
0.01
Figure 31. Output Voltage to Supply Rail vs. Load Current
270
VSY = ±5V
CL = 0
RL = ∞
40
180
30
135
GAIN
20
90
PHASE
10
VSY = ±5V
CL = 300pF
RL = 2kΩ
VIN = 1V
AV = 1
225
45
0
0
–10
VOLTAGE (1V/DIV)
50
1M
10k
100k
FREQUENCY (Hz)
Figure 34. Output Impedance vs. Frequency
PHASE SHIFT (Degrees)
60
1k
02627-034
50
0
0.001
GND
–45
–20
100k
–90
10M
1M
FREQUENCY (Hz)
02627-032
OPEN-LOOP GAIN (dB)
AV = 1
AV = 100
02627-035
ΔOUTPUT VOLTAGE (V)
400
1.0
TIME (100µs/DIV)
Figure 32. Open-Loop Gain and Phase Shift vs. Frequency
Figure 35. Large Signal Transient Response
120
VSY = ±5V
VIN = 4mV p-p
CL = 0
RL = ∞
100
VOLTAGE (50mV/DIV)
60
AV = 100
40
AV = 10
20
0
AV = 1
–20
GND
–40
–80
1k
10k
100k
1M
FREQUENCY (Hz)
10M
100M
Figure 33. Closed-Loop Gain vs. Frequency
TIME (10µs/DIV)
Figure 36. Small Signal Transient Response
Rev. I | Page 10 of 24
02627-036
–60
02627-033
CLOSED-LOOP GAIN (dB)
80
VSY = ±5V
CL = 1,000pF
RL = 2kΩ
VIN = 100mV
AV = 1
Data Sheet
OP1177/OP2177/OP4177
50
VSY = ±5V
RL = 2kΩ
VIN = 100mV
40
35
30
25
VS = ±5V
AV = 1
RL = 10kΩ
INPUT
VOLTAGE (2V/DIV)
SMALL SIGNAL OVERSHOOT (%)
45
+OS
20
15
10
GND
–OS
OUTPUT
1
10
100
CAPACITANCE (pF)
1k
10k
02627-040
0
02627-037
5
TIME (200µs/DIV)
Figure 40. No Phase Reversal
Figure 37. Small Signal Overshoot vs. Load Capacitance
140
0V
VSY = ±5V
RL = 10kΩ
AV = –100
VIN = 200mV
VSY = ±5V
120
OUTPUT
100
CMRR (dB)
–15V
+200mV
80
60
40
INPUT
0
02627-038
TIME (4µs/DIV)
10
100
1k
10k
100k
FREQUENCY (Hz)
200
VSY = ±5V
RL = 10kΩ
AV = –100
VIN = 200mV
OUTPUT
10M
Figure 41. CMRR vs. Frequency
Figure 38. Positive Overvoltage Recovery
5V
1M
02627-041
20
0V
VSY = ±5V
180
160
140
PSRR (dB)
0V
INPUT
0V
120
100
–PSRR
80
60
+PSRR
40
–200mV
0
02627-039
TIME (4µs/DIV)
10
100
1k
10k
100k
FREQUENCY (Hz)
Figure 42. PSRR vs. Frequency
Figure 39. Negative Overvoltage Recovery
Rev. I | Page 11 of 24
1M
10M
02627-042
20
OP1177/OP2177/OP4177
Data Sheet
4.40
VSY = ±5V
VSY = ±5V
VNOISE (0.2µV/DIV)
OUTPUT VOLTAGE SWING (V)
4.35
4.30
+VOH
4.25
–VOL
4.20
4.15
4.10
4.00
–50
02627-043
TIME (1s/DIV)
0
50
TEMPERATURE (°C)
100
Figure 46. Output Voltage Swing vs. Temperature
Figure 43. 0.1 Hz to 10 Hz Input Voltage Noise
25
18
VSY = ±5V
VSY = ±5V
INPUT OFFSET VOLTAGE (µV)
16
14
12
10
8
6
20
15
10
5
2
0
50
100
150
FREQUENCY (Hz)
200
250
0
–50
0
50
100
150
TEMPERATURE (°C)
Figure 44. Voltage Noise Density vs. Frequency
02627-047
4
02627-044
VOLTAGE NOISE DENSITY (nV/√Hz)
150
02627-046
4.05
Figure 47. Input Offset Voltage vs. Temperature
35
600
VSY = ±5V
500
VSY = ±15V
+ISC
SUPPLY CURRENT (µA)
25
–ISC
20
15
10
VSY = ±5V
300
200
0
50
TEMPERATURE (°C)
100
150
0
–50
0
50
100
TEMPERATURE (°C)
Figure 45. Short-Circuit Current vs. Temperature
Figure 48. Supply Current vs. Temperature
Rev. I | Page 12 of 24
150
02627-048
0
–50
400
100
5
02627-045
SHORT-CIRCUIT CURRENT (mA)
30
Data Sheet
OP1177/OP2177/OP4177
450
0
TA = 25°C
–20
CHANNEL SEPARATION (dB)
350
300
250
200
150
100
–40
–60
–80
–100
–120
0
0
5
10
15
20
25
30
SUPPLY VOLTAGE (V)
35
–160
10
100
1k
10k
FREQUENCY (Hz)
100k
Figure 50. Channel Separation vs. Frequency
Figure 49. Supply Current vs. Supply Voltage
Rev. I | Page 13 of 24
1M
02627-050
–140
50
02627-049
SUPPLY CURRENT (µA)
400
OP1177/OP2177/OP4177
Data Sheet
FUNCTIONAL DESCRIPTION
Analog Devices proprietary process technology and linear design
expertise has produced a high voltage amplifier with superior
performance to the OP07, OP77, and OP177 in a tiny MSOP
8lead package. Despite its small size, the OPx177 offers numerous
improvements, including low wideband noise, very wide input
and output voltage range, lower input bias current, and
complete freedom from phase inversion.
OPx177 has a specified operating temperature range as wide as
any similar device in a plastic surface-mount package. This is
increasingly important as PCB and overall system sizes continue
to shrink, causing internal system temperatures to rise. Power
consumption is reduced by a factor of four from the OP177,
and bandwidth and slew rate increase by a factor of two. The
low power dissipation and very stable performance vs.
temperature also act to reduce warmup drift errors to
insignificant levels.
Open-loop gain linearity under heavy loads is superior to competitive parts, such as the OPA277, improving dc accuracy and
reducing distortion in circuits with high closed-loop gains.
Inputs are internally protected from overvoltage conditions
referenced to either supply rail.
Like any high performance amplifier, maximum performance is
achieved by following appropriate circuit and PCB guidelines.
The following sections provide practical advice on getting the
most out of the OPx177 under a variety of application conditions.
For RS < 3.9 kΩ, en dominates and
en,TOTAL ≈ en
For 3.9 kΩ < RS < 412 kΩ, voltage noise of the amplifier, the
current noise of the amplifier translated through the source
resistor, and the thermal noise from the source resistor all
contribute to the total noise.
For RS > 412 kΩ, the current noise dominates and
en,TOTAL ≈ inRS
The total equivalent rms noise over a specific bandwidth is
expressed as
en
e
n , TOTAL
BW
where BW is the bandwidth in hertz.
The preceding analysis is valid for frequencies larger than 50 Hz.
When considering lower frequencies, flicker noise (also known as
1/f noise) must be taken into account.
For a reference on noise calculations, refer to the Band-Pass
KRC or Sallen-Key Filter section.
GAIN LINEARITY
Gain linearity reduces errors in closed-loop configurations. The
straighter the gain curve, the lower the maximum error over the
input signal range. This is especially true for circuits with high
closed-loop gains.
The OP1177 has excellent gain linearity even with heavy loads,
as shown in Figure 51. Compare its performance to the OPA277,
shown in Figure 52. Both devices are measured under identical
conditions, with RL = 2 kΩ. The OP2177 (dual) has virtually no
distortion at lower voltages. Compared to the OPA277 at
several supply voltages and various loads, OP1177 performance
far exceeds that of its counterpart.
TOTAL NOISE-INCLUDING SOURCE RESISTORS
The total noise density of the OPx177 is
en, TOTAL en2 in RS 2 4kTRS
where:
en is the input voltage noise density.
in is the input current noise density.
RS is the source resistance at the noninverting terminal.
k is Boltzmann’s constant (1.38 × 10−23 J/K).
T is the ambient temperature in Kelvin (T = 273 + temperature
in degrees Celsius).
Rev. I | Page 14 of 24
(10µV/DIV)
The low input current noise and input bias current of the OPx177
make it useful for circuits with substantial input source resistance.
Input offset voltage increases by less than 1 μV maximum per
500 Ω of source resistance.
VSY = ±15V
RL = 2kΩ
OP1177
(5V/DIV)
Figure 51. Gain Linearity
02627-051
The OPx177 series is the fourth generation of Analog Devices,
Inc., industry-standard OP07 amplifier family. OPx177 is a
high precision, low noise operational amplifier with a
combination of extremely low offset voltage and very low input
bias currents. Unlike JFET amplifiers, the low bias and offset
currents are relatively insensitive to ambient temperatures,
even up to 125°C.
Data Sheet
OP1177/OP2177/OP4177
OPA277
(5V/DIV)
VIN
VOUT
TIME (400µs/DIV)
02627-053
VOLTAGE (5V/DIV)
VSY = 10V
AV = 1
02627-052
(10µV/DIV)
VSY = ±15V
RL = 2kΩ
Figure 53. No Phase Reversal
Figure 52. Gain Linearity
INPUT OVERVOLTAGE PROTECTION
SETTLING TIME
When input voltages exceed the positive or negative supply
voltage, most amplifiers require external resistors to protect
them from damage.
Settling time is defined as the time it takes an amplifier output
to reach and remain within a percentage of its final value after
application of an input pulse. It is especially important in measurement and control circuits in which amplifiers buffer ADC
inputs or DAC outputs.
The OPx177 has internal protective circuitry that allows voltages as
high as 2.5 V beyond the supplies to be applied at the input of
either terminal without any harmful effects.
Use an additional resistor in series with the inputs if the voltage
exceeds the supplies by more than 2.5 V. The value of the resistor
can be determined from the formula
VIN VS
RS 500
5 mA
To minimize settling time in amplifier circuits, use proper
bypassing of power supplies and an appropriate choice of
circuit components. Resistors should be metal film types,
because they have less stray capacitance and inductance than
their wire-wound counterparts. Capacitors should be
polystyrene or polycarbonate types to minimize dielectric
absorption.
With the OPx177 low input offset current of
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