22 μA, RRIO, CMOS, 18 V

Operational Amplifier

Data Sheet

AD8546/AD8548

Rev. C

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FEATURES

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

Low input bias current: 20 pA maximum

Gain bandwidth product: 240 kHz at AV =100 typical

Unity-gain crossover: 240 kHz

−3 dB closed-loop bandwidth: 310 kHz

Slew rate: 80 V/ms

Large signal voltage gain: 110 dB minimum

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 medical equipment

Remote sensors

Transimpedance amplifiers

Current monitors

4 mA to 20 mA loop drivers

Buffer/level shifting

PIN CONFIGURATIONS

OUT A 1

–IN A 2

+IN A 3

V–

4

V+

8

OUT B

7

–IN B

6

+IN B

5

AD8546

TOP VIEW

(Not to Scale)

Figure 1. AD8546 (8-Lead MSOP)

OUT A

1

–IN A

2

+IN A

3

V+

4

OUT D

14

–IN D

13

+IN D

12

V–

11

+IN B

5

+IN C

10

–IN B

6

–IN C

9

OUT B 7

OUT C

8

AD8548

TOP VIEW

(Not to Scale)

Figure 2. AD8548 (14-Lead SOIC_N)

GENERAL DESCRIPTION

The AD8546 and AD8548 are dual and quad micropower, high

input impedance amplifiers optimized for low power and wide

operating supply voltage range applications.

The AD8546/AD8548 rail-to-rail input/output (RRIO) feature

provides increased dynamic range to drive low frequency data

converters, making these amplifiers ideal for dc gain and buffering

of sensor front ends or high impedance input sources used in

wireless or remote sensors or transmitters. The AD8546/

AD8548 also have high immunity to electromagnetic

interference.

The low supply current specification (22 μA) of the AD8546/

AD8548 over a wide operating voltage range of 2.7 V to 18 V

or dual supplies (±1.35 V to ±9 V) makes these amplifiers useful

for a variety of battery-powered, portable applications, such as

ECGs, pulse monitors, glucose meters, smoke and fire detectors,

vibration monitors, and backup battery sensors.

The AD8546/AD8548 are specified over the extended industrial

temperature range of −40°C to +125°C. The AD8546 is available

in an 8-lead MSOP package; the AD8548 is available in a 14-lead

SOIC_N package.

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

Amplifier

Supply Voltage

5 V

12 V to 18 V

36 V

Single

AD8500

AD8663

AD8505

AD8541

AD8603

ADA4505-1

Dual

AD8502

AD8546

AD8506

AD8657

ADA4062-2

AD8542

AD8667

ADA4096-2

AD8607

OP281

ADA4505-2

Quad

AD8504

AD8548

AD8508

AD8669

ADA4062-4

AD8544

OP481

ADA4096-4

AD8609

AD8659

ADA4505-4

1 See www.analog.com for the latest selection of micropower op amps.