Precision Low Noise, Low Input

Bias Current Operational Amplifiers

Data Sheet

OP1177/OP2177/OP4177

Rev. I

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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 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

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

PIN CONFIGURATIONS

–IN

+IN

V–

V+

NC

NC

18

OP1177

NC

OUT

NC = NO CONNECT

45

1

2

3

4

8

7

6

5

–IN

V–

+IN

V+

OUT

NC

NC

NC

NC = NO CONNECT

OP1177

Figure 1. 8-Lead MSOP (RM Suffix)

Figure 2. 8-Lead SOIC_N (R Suffix)

–IN A

+IN A

V–

OUT B

+IN B

V+

18

OP2177

OUT A

–IN B

45

1

2

3

4

8

7

6

5

–IN A

V–

+IN A

OUT B

–IN B

V+

+IN B

OUT A

OP2177

Figure 3. 8-Lead MSOP (RM Suffix)

Figure 4. 8-Lead SOIC_N (R Suffix)

OUT B 78

+IN B 5

10

–IN B 69

V+ 4

11

–IN A 213

+IN A 3

12

OUT A 1

14

OUT C

+IN C

–IN C

V–

–IN D

+IN D

OUT D

OP4177

OUT A

–IN A

+IN A

V+

+IN B

–IN B

OUT B

–IN D

+IN D

V–

OUT D

–IN C

OUT C

+IN C

14

8

1

7

OP4177

Figure 5. 14-Lead SOIC_N (R Suffix)

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 consump-

tion. 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

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.