22 µA, RRIO, CMOS,18 V

Operational Amplifiers

Data Sheet

AD8657/AD8659

Rev. B

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FEATURES

Micropower at high voltage (18 V): 22 μA maximum

Low offset voltage: 350 µV maximum

Low input bias current: 20 pA maximum

Gain bandwidth product: 230 kHz at A

Unity-gain crossover: 230 kHz

−3 dB closed-loop bandwidth: 305 kHz

Single-supply operation: 2.7 V to 18 V

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

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

GENERAL DESCRIPTION

The AD8657/AD8659 are dual and quad micropower, precision,

rail-to-rail input/output amplifiers optimized for low power and

wide operating supply voltage range applications.

The AD8657/AD8659 operate from 2.7 V to 18 V with a typical

quiescent supply current of 18 μA. The devices use the Analog

Devices, Inc., patented DigiTrim® trimming technique, which

achieves low offset voltage. The AD8657/AD8659 also have

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 make the AD8657/AD8659 ideal for current

monitoring in process and motor control applications. The

combination of precision specifications makes these devices

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

impedance input sources in wireless or remote sensors or

transmitters.

The AD8657/AD8659 are specified over the extended industrial

temperature range (−40°C to +125°C). The AD8657 is available in

an 8-lead MSOP package and an 8-lead LFCSP package; the

AD8659 is available in a 14-lead SOIC package and 16-lead

LFCSP package.

PIN CONNECTION DIAGRAMS

V–

4

V+

8

OUT B

7

–IN B

6

+IN B

5

AD8657

TOP VIEW

(Not to Scale)

Figure 1. AD8657 Pin Configuration, 8-Lead MSOP

AD8657

TOP VIEW

(Not to Scale)

NOTES

1. CONNECT THE EXPOSED PAD TO V– OR

LEAVE IT UNCONNECTED.

3

+IN A

4

V–

1

OUT A

2

–IN A

6 –IN B

5 +IN B

8 V+

7 OUT B

Figure 2. AD8657 Pin Configuration, 8-Lead LFCSP

Note: For AD8659 pin connections and for more information

about the pin connections for these products, see the Pin

Configurations and Function Descriptions section.

0

10

20

30

40

50

60

–50

–25

0

25

50

75

100

125

TEMPERATURE (°C)

Figure 3. AD8657, Supply Current vs. Temperature

Table 1. Precision Micropower Op Amps (<250 µA)

Supply Voltage

5 V

12 V to 16 V

36 V

Single

AD8538

OP196

AD8603

ADA4051-1

Dual

AD8539

AD8657

AD8622

AD8607

ADA4091-2

ADA4051-2

ADA4096-2

Quad

AD8609

AD8659

AD8624

ADA4091-4

ADA4096-4