ANALOG DEVICES OP1177, OP2177, OP4177 Service Manual

Precision Low Noise, Low Input

–

+

FEATURES

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 A
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

APPLICATIONS

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

> 120 dB minimum

VO

Bias Current Operational Amplifiers

OP1177/OP2177/OP4177

PIN CONFIGURATIONS

NC

1

IN

2

18

NC
–IN

OP1177

+IN

V–

45

NC = NO CONNECT

NC
V+
OUT

NC

02627-001

OP1177

IN

3

V–

4

NC = NO CONNECT

Figure 1. 8-Lead MSOP (RM Suffix) Figure 2. 8-Lead SOIC_N (R Suffix)

OUT A

1

–IN A

2

OUT A

–IN A
+IN A

18

OP2177

45

V–

V+
OUT B
–IN B

+IN B

02627-003

+IN A

OP2177

3

V–

4

Figure 3. 8-Lead MSOP (RM Suffix) Figure 4. 8-Lead SOIC_N (R Suffix)

OUT A

1

213

–IN A

+IN A

3

OP4177

V+

4

5

+IN B

69

–IN B

78

OUT B

OUT D

14

–IN D

+IN D

12

11

V–

+IN C

10

–IN C

OUT C

OUT A

OUT B

02627-005

–IN A
+IN A

+IN B
–IN B

1

OP4177

V+

7

Figure 5. 14-Lead SOIC_N (R Suffix) Figure 6. 14-Lead TSSOP (RU Suffix)

NC

8

V+

7

OUT

6

NC

5

02627-002

V+

8

OUT B

7

–IN B

6

+IN B

5

OUT D

14

–IN D
+IN D
V–
+IN C
–IN C

8

OUT C

02627-004

02627-006

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 A
per amplifier at 30 V. Internal 500  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. G

Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.

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, strain­bridge, and other sensor signal conditioning—and precision filters.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] ©2001–2009 Analog Devices, Inc. All rights reserved.

OP1177/OP2177/OP4177

TABLE OF CONTENTS

Features .............................................................................................. 1

Overload Recovery Time .......................................................... 15

Applications ....................................................................................... 1

Pin Configurations ........................................................................... 1

General Description ......................................................................... 1

Revision History ............................................................................... 2

Specifications ..................................................................................... 3

Electrical Characteristics ............................................................. 4

Absolute Maximum Ratings ............................................................ 5

Thermal Resistance ...................................................................... 5

ESD Caution .................................................................................. 5

Typical Performance Characteristics ............................................. 6

Functional Description .................................................................. 14

Total Noise-Including Source Resistors ................................... 14

Gain Linearity ............................................................................. 14

Input Overvoltage Protection ................................................... 15

Output Phase Reversal ............................................................... 15

THD + Noise ............................................................................... 16

Capacitive Load Drive ............................................................... 16

Stray Input Capacitance Compensation .................................. 17

Reducing Electromagnetic Interference .................................. 17

Proper Board Layout .................................................................. 18

Difference Amplifiers ................................................................ 18

A High Accuracy Thermocouple Amplifier ........................... 19

Low Power Linearized RTD ...................................................... 19

Single Operational Amplifier Bridge ....................................... 20

Realization of Active Filters .......................................................... 21

Band-Pass KRC or Sallen-Key Filter ........................................ 21

Channel Separation .................................................................... 21

References on Noise Dynamics and Flicker Noise ............... 21

Outline Dimensions ....................................................................... 22

Ordering Guide .......................................................................... 24

Settling Time ............................................................................... 15

REVISION HISTORY

11/09—Rev. F to Rev. G

Changes to Figure 64 ...................................................................... 19

Changes to Ordering Guide .......................................................... 24

Updated Outline Dimensions ....................................................... 22

5/09—Rev. E to Rev. F

Changes to Figure 64 ...................................................................... 19

Changes to Ordering Guide .......................................................... 24

10/07—Rev. D to Rev. E

Changes to General Description .................................................... 1

Changes to Table 4 ............................................................................ 5

Updated Outline Dimensions ....................................................... 22

7/06—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

Rev. G | Page 2 of 24

Changes to Figure 67 and Figure 68............................................. 21

Removed SPICE Model Section ................................................... 21

Updated Outline Dimensions ....................................................... 22

Changes to Ordering Guide .......................................................... 24

4/04—Rev. B to Rev. C

Changes to Ordering Guide ............................................................. 4

Changes to TPC 6 .............................................................................. 5

Changes to TPC 26 ............................................................................ 7

Updated Outline Dimensions ....................................................... 17

4/02—Rev. A to Rev. B

Added OP4177 ......................................................................... Global

Edits to Specifications ....................................................................... 2

Edits to Electrical Characteristics Headings .................................. 4

Edits to Ordering Guide ................................................................... 4

11/01—Rev. 0 to Rev. A

Edit to Features .................................................................................. 1

Edits to TPC 6 ................................................................................... 5

7/01—Revision 0: Initial Version

OP1177/OP2177/OP4177

SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

VS = ±5.0 V, VCM = 0 V, TA = 25°C, unless otherwise noted.

Table 1.

Parameter Symbol Conditions Min Typ1 Max Unit

INPUT CHARACTERISTICS

Offset Voltage

OP1177 VOS 15 60 V
OP2177/OP4177 VOS 15 75 V
OP1177/OP2177 VOS −40°C < TA < +125°C 25 100 V

OP4177 VOS −40°C < TA < +125°C 25 120 V
Input Bias Current IB −40°C < TA < +125°C −2 +0.5 +2 nA
Input Offset Current IOS −40°C < TA < +125°C −1 +0.2 +1 nA
Input Voltage Range −3.5 +3.5 V
Common-Mode Rejection Ratio CMRR VCM = −3.5 V to +3.5 V 120 126 dB

−40°C < TA < +125°C 118 125 dB
Large Signal Voltage Gain AVO R
Offset Voltage Drift

OP1177/OP2177 ∆VOS/∆T −40°C < TA < +125°C 0.2 0.7 V/°C

OP4177 ∆VOS/∆T −40°C < TA < +125°C 0.3 0.9 V/°C

OUTPUT CHARACTERISTICS

Output Voltage High VOH I
Output Voltage Low VOL I
Output Current I

V

OUT

POWER SUPPLY

Power Supply Rejection Ratio

OP1177 PSRR VS = ±2.5 V to ±15 V 120 130 dB

−40°C < TA < +125°C 115 125 dB

OP2177/OP4177 PSRR VS = ±2.5 V to ±15 V 118 121 dB

−40°C < TA < +125°C 114 120 dB
Supply Current per Amplifier ISY V

−40°C < TA < +125°C 500 600 A

DYNAMIC PERFORMANCE

Slew Rate SR RL = 2 kΩ 0.7 V/s
Gain Bandwidth Product GBP 1.3 MHz

NOISE PERFORMANCE

Voltage Noise en p-p 0.1 Hz to 10 Hz 0.4 V p-p
Voltage Noise Density en f = 1 kHz 7.9 8.5 nV/√Hz
Current Noise Density in f = 1 kHz 0.2 pA/√Hz

MULTIPLE AMPLIFIERS CHANNEL SEPARATION CS DC 0.01 V/V
f = 100 kHz −120 dB

1

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.

= 2 kΩ, VO = −3.5 V to +3.5 V 1000 2000 V/mV

L

= 1 mA, −40°C < TA < +125°C +4 +4.1 V

L

= 1 mA, −40°C < TA < +125°C −4.1 −4 V

L

< 1.2 V ±10 mA

DROPOUT

= 0 V 400 500 A

O

Rev. G | Page 3 of 24

OP1177/OP2177/OP4177

ELECTRICAL CHARACTERISTICS

VS = ±15 V, VCM = 0 V, TA = 25°C, unless otherwise noted.

Table 2.

Parameter Symbol Conditions Min Typ1 Max Unit

INPUT CHARACTERISTICS

Offset Voltage

OP1177 VOS 15 60 V
OP2177/OP4177 VOS 15 75 V
OP1177/OP2177 VOS −40°C < TA < +125°C 25 100 V

OP4177 VOS −40°C < TA < +125°C 25 120 V
Input Bias Current IB −40°C < TA < +125°C −2 +0.5 +2 nA
Input Offset Current IOS −40°C < TA < +125°C −1 +0.2 +1 nA
Input Voltage Range −13.5 +13.5 V
Common-Mode Rejection Ratio CMRR VCM = −13.5 V to +13.5 V,

−40°C < TA < +125°C 120 125 dB
Large Signal Voltage Gain AVO R
Offset Voltage Drift

OP1177/OP2177 ∆VOS/∆T −40°C < TA < +125°C 0.2 0.7 V/°C

OP4177 ∆VOS/∆T −40°C < TA < +125°C 0.3 0.9 V/°C

OUTPUT CHARACTERISTICS

Output Voltage High VOH I
Output Voltage Low VOL I
Output Current I

V

OUT

Short-Circuit Current ISC ±25 mA

POWER SUPPLY

Power Supply Rejection Ratio

OP1177 PSRR VS = ±2.5 V to ±15 V 120 130 dB

−40°C < TA < +125°C 115 125 dB

OP2177/OP4177 PSRR VS = ±2.5 V to ±15 V 118 121 dB

−40°C < TA < +125°C 114 120 dB
Supply Current per Amplifier ISY V

−40°C < TA < +125°C 500 600 A

DYNAMIC PERFORMANCE

Slew Rate SR RL = 2 kΩ 0.7 V/s
Gain Bandwidth Product GBP 1.3 MHz

NOISE PERFORMANCE

Voltage Noise en p-p 0.1 Hz to 10 Hz 0.4 V p-p
Voltage Noise Density en f = 1 kHz 7.9 8.5 nV/√Hz
Current Noise Density in f = 1 kHz 0.2 pA/√Hz

MULTIPLE AMPLIFIERS CHANNEL SEPARATION CS DC 0.01 V/V
f = 100 kHz −120 dB

1

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.

= 2 kΩ, VO = –13.5 V to +13.5 V 1000 3000 V/mV

L

= 1 mA, −40°C < TA < +125°C +14 +14.1 V

L

= 1 mA, −40°C < TA < +125°C −14.1 −14 V

L

< 1.2 V ±10 mA

DROPOUT

= 0 V 400 500 A

O

Rev. G | Page 4 of 24

OP1177/OP2177/OP4177

ABSOLUTE MAXIMUM RATINGS

Table 3.

Parameter Rating

Supply Voltage 36 V
Input Voltage VS− to VS+
Differential Input Voltage ±Supply Voltage
Storage Temperature Range

R, RM, and RU Packages −65°C to +150°C

Operating Temperature Range

OP1177/OP2177/OP4177 −40°C to +125°C

Junction Temperature Range

R, RM, and RU Packages −65°C to +150°C

Lead Temperature, Soldering (10 sec) 300°C

Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.

THERMAL RESISTANCE

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 Type θJA θ

8-Lead MSOP (RM-8)1 190 44 °C/W
8-Lead SOIC_N (R-8) 158 43 °C/W
14-Lead SOIC_N (R-14) 120 36 °C/W
14-Lead TSSOP (RU-14) 240 43 °C/W

1

MSOP is available in tape and reel only.

Unit

JC

ESD CAUTION

Rev. G | Page 5 of 24

OP1177/OP2177/OP4177

TYPICAL PERFORMANCE CHARACTERISTICS

50

VSY = ±15V

45

40

35

30

25

20

15

NUMBER OF AMPLIFIERS

10

5

0

–30 –20 –10 0 10 20 30 40

–40

INPUT OFFSET VOLTAGE (µV)

Figure 7. Input Offset Voltage Distribution

02627-007

1.8
VSY = ±15V

= 25°C

T

A

1.6

1.4

1.2

1.0

0.8

0.6

ΔOUTPUT VOL TAGE (V)

0.4

0.2

0

0.001 10

SOURCE

SINK

0.01 0.1 1

LOAD CURRENT (mA)

Figure 10. Output Voltage to Supply Rail vs. Load Current

02627-010

90

80

70

60

50

40

30

NUMBER OF AMPLIFIERS

20

10

0

0.15 0.25 0.35 0.45 0. 55 0.65

0.05

INPUT OFFSET VOLTAGE DRIFT (µV/°C)

Figure 8. Input Offset Voltage Drift Distribution

VSY = ±15V

02627-008

140

VSY = ±15V

120

100

80

60

40

NUMBER OF AMPL IFIERS

20

0

0.1 0.2 0.3 0.4 0.5 0.6 0.7

0

INPUT BIAS CURRENT (nA)

Figure 9. Input Bias Current Distribution

02627-009

3

2

1

0

–1

INPUT BI AS CURRE NT (nA)

–2

–3

–50 150

0 50 100

TEMPERATURE (°C)

Figure 11. Input Bias Current vs. Temperature

60

VSY = ±15V
C

= 0

L

50

R

=

∞

L

40

30

GAIN

20

10

OPEN-LOOP GAIN (dB)

0

–10

–20

100k 10M

1M

FREQUENCY (Hz)

Figure 12. Open-Loop Gain and Phase Shift vs. Frequency

PHASE

VSY = ±15V

270

225

180

135

90

45

0

–45

–90

2627-011

PHASE SHIFT (Degrees)

02627-012

Rev. G | Page 6 of 24

OP1177/OP2177/OP4177

V

120

100

80

60

AV = 100

40

AV = 10

20

0

AV = 1

–20

CLOSED-LOOP GAIN (dB)

–40

–60

–80

1k 100M

10k 100k 1M 10M

FREQUENCY (Hz)

VSY = ±15V
V

= 4mV p-p

IN

C

= 0

L

R

=

∞

L

Figure 13. Closed-Loop Gain vs. Frequency

02627-013

VOLTAGE (100mV/DIV)

GND

VSY = ±15V

= 1,000pF

C

L

= 2kΩ

R

L

= 100mV

V

IN

= 1

A

V

TIME (100µ s/DIV)

Figure 16. Small Signal Transient Response

02627-016

500

VSY = ±15V

450

= 50mV p-p

V

IN

400

350

300

250

200

150

OUTPUT IMPEDANCE (Ω)

100

50

0

100

1k 10k 100k 1M

FREQUENCY (Hz)

AV = 10

AV = 100

AV = 1

2627-014

Figure 14. Output Impedance vs. Frequency

VSY = ±15V
C

= 300pF

L

R

= 2kΩ

L

V

= 4V

IN

A

= 1

V

50

VSY = ±15V

45

= 2kΩ

R

L

= 100mV p-p

V

IN

40

35

30

25

20

15

10

SMALL SIG NAL OVERSHO OT (%)

5

0

1 10k

10 100 1k

CAPACITANCE (pF)

+OS

–OS

02627-017

Figure 17. Small Signal Overshoot vs. Load Capacitance

VSY = ±15V
R

= 10kΩ

L

A

= –100

–15V

V

V

= 200mV

IN

0V

OUTPUT

VOLTAGE (1V/DIV)

GND

TIME (100µs/ DIV)

Figure 15. Large Signal Transient Response

02627-015

+200m

0V

TIME (10µs/DIV)

Figure 18. Positive Overvoltage Recovery

INPUT

2627-018

Rev. G | Page 7 of 24

OP1177/OP2177/OP4177

–

V

√

OUTPUT

15V

0V

VSY = ±15V
R

= 10kΩ

L

A

= –100

V

V

= 200mV

IN

0V

VSY = ±15V

(0.2µV/DIV)

NOISE

V

200m

CMRR (dB)

PSRR (dB)

INPUT

TIME (4µs/DIV)

Figure 19. Negative Overvoltage Recovery

140

120

100

80

60

40

20

0

10 10M

100 1k 10k 100k 1M

FREQUENCY (Hz)

VSY = ±15V

Figure 20. CMRR vs. Frequency

140

120

100

80

60

+PSRR

VSY = ±15V

–PSRR

2627-019

TIME (1s/DIV)

2627-022

Figure 22. 0.1 Hz to 10 Hz Input Voltage Noise

18

VSY = ±15V

16

Hz)

14

12

10

8

6

VOLTAGE NOISE DENSITY (nV/

4

2

2627-020

50 100 150 2000 250

FREQUENCY ( Hz)

02627-023

Figure 23. Voltage Noise Density vs. Frequency

35

30

+I

25

20

15

SC

–I

SC

V

SY

= ±15V

40

20

0

10 10M

100 1k 10k 100k 1M

FREQUENCY (Hz)

Figure 21. PSRR vs. Frequency

02627-021

10

SHORT-CIRCUIT CURRENT (mA)

5

0

–50 150

0 50 100

TEMPERATURE ( °C)

Figure 24. Short-Circuit Current vs. Temperature

2627-024

Rev. G | Page 8 of 24