CMOS Single-Supply, Rail-to-Rail Input/Output

Operational Amplifiers with Shutdown

AD8591/AD8592/AD8594

Rev. B

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FEATURES

Single-supply operation: 2.5 V to 6 V

High output current: ±250 mA

Extremely low shutdown supply current: 100 nA

Low supply current: 750 μA/Amp

Wide bandwidth: 3 MHz

Slew rate: 5 V/μs

No phase reversal

Very low input bias current

High impedance outputs when in shutdown mode

Unity-gain stable

APPLICATIONS

Mobile communication handset audio

PC audio

PCMCIA/modem line driving

Battery-powered instrumentation

Data acquisition

ASIC input or output amplifiers

LCD display reference level drivers

GENERAL DESCRIPTION

The AD8591, AD8592, and AD8594 are single, dual, and quad

rail-to-rail, input and output single-supply amplifiers featuring

250 mA output drive current and a power saving shutdown mode.

The AD8592 includes an independent shutdown function for

each amplifier. When both amplifiers are in shutdown mode,

the total supply current is reduced to less than 1 μA. The AD8591

and AD8594 include a single master shutdown function that

reduces the total supply current to less than 1 μA. All amplifier

outputs are in a high impedance state when in shutdown mode.

These amplifiers have very low input bias currents, making them

suitable for integrators and diode amplification. Outputs are stable

with virtually any capacitive load. Supply current is less than

750 μA per amplifier in active mode.

Applications for these amplifiers include audio amplification for

portable computers, portable phone headsets, sound ports, sound

cards, and set-top boxes. The AD859x family is capable of driving

heavy capacitive loads, such as LCD panel reference levels.

The ability to swing rail to rail at both the input and output enables

designers to buffer CMOS DACs, ASICs, and other wide output

swing devices in single-supply systems.

PIN CONFIGURATIONS

V+

6

SD

5

–IN A

4

AD8591

TOP VIEW

(Not to Scale)

Figure 1. 6-Lead SOT-23 (RJ Suffix)

SDB

V–

+IN B

OUT A

–IN A

+IN A

V+

OUT B

–IN B

SDA

1

2

3

4

5

10

9

8

7

6

AD8592

TOP VIEW

(Not to Scale)

Figure 2. 10-Lead MSOP (RM Suffix)

OUT A

–IN A

V+

+IN A

+IN B

–IN B

OUT B

NC

OUT D

–IN D

+IN D

V–

+IN C

–IN C

OUT C

SD

1

2

3

4

16

15

14

13

5

12

6

11

7

10

8

9

NC = NO CONNECT

AD8594

TOP VIEW

(Not to Scale)

Figure 3. 16-Lead Narrow SOIC (R Suffix)

OUT A

–IN A

V+

+IN A

+IN B

–IN B

OUT B

NC

OUT D

–IN D

+IN D

V–

+IN C

–IN C

OUT C

SD

NC = NO CONNECT

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

AD8594

TOP VIEW

(Not to Scale)

Figure 4. 16-Lead TSSOP (RU Suffix)

The AD8591, AD8592, and AD8594 are specified over the

industrial temperature range (−40°C to +85°C). The AD8591,

single, is available in the tiny 6-lead SOT-23 package. The AD8592,

dual, is available in the 10-lead surface-mount MSOP package. The

AD8594, quad, is available in 16-lead narrow SOIC and 16-lead

TSSOP packages.