18 V, Precision, Micropower

CMOS RRIO Operational Amplifier

AD8657

Rev. A

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FEATURES

Micropower at high voltage (18 V): 18 μA typical

Low offset voltage: 350 μV maximum

Single-supply operation: 2.7 V to 18 V

Dual-supply operation: ±1.35 V to ±9 V

Low input bias current: 20 pA

Gain bandwidth: 200 kHz

Unity-gain stable

Excellent electromagnetic interference immunity

APPLICATIONS

Portable operating systems

Current monitors

4 mA to 20 mA loop drivers

Buffer/level shifting

Multipole filters

Remote/wireless sensors

Low power transimpedance amplifiers

PIN CONFIGURATION

V–

4

V+

8

OUT B

7

–IN B

6

+IN B

5

AD8657

TOP VIEW

(Not to Scale)

Figure 1. 8-Lead MSOP

AD8657

TOP VIEW

(Not to Scale)

NOTES

1. IT IS RECOMMENDED TO CONNECT

THE EXPOSED PAD TO V–.

3

+IN A

4

V–

1

OUT A

2

–IN A

6 –IN B

5 +IN B

8V+

7OUT B

Figure 2. 8-Lead LFCSP

GENERAL DESCRIPTION

The AD8657 is a dual, micropower, precision, rail-to-rail

input/output amplifier optimized for low power and wide

operating supply voltage range applications.

The AD8657 operates from 2.7 V up to 18 V with a typical

quiescent supply current of 18 μA. It uses the Analog Devices,

Inc., patented DigiTrim® trimming technique, which achieves

low offset voltage. The AD8657 also has high immunity to

electromagnetic interference.

The combination of low supply current, low offset voltage, very

low input bias current, wide supply range, and rail-to-rail input

and output makes the AD8657 ideal for current monitoring and

current loops in process and motor control applications. The

combination of precision specifications makes this device ideal

for dc gain and buffering of sensor front ends or high impedance

input sources in wireless or remote sensors or transmitters.

The AD8657 is specified over the extended industrial tempera-

ture range (−40°C to +125°C) and is available in an 8-lead MSOP

package and an 8-lead LFCSP package.

Table 1. Micropower Op Amps

Supply Voltage

5 V

12 V to 16 V

36 V

Single

AD8500

AD8663

ADA4505-1

AD8505

AD8541

AD8603

Dual

AD8502

AD8667

OP295

ADA4505-2

OP281

ADA4062-2

AD8506

AD8542

AD8607

Quad

AD8504

AD8669

OP495

ADA4505-4

OP481

ADA4062-4

AD8508

AD8544

AD8609