CMOS Rail-to-Rail General-Purpose

Amplifiers

AD8541/AD8542/AD8544

Rev. G

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FEATURES

Single-supply operation: 2.7 V to 5.5 V

Low supply current: 45 μA/amplifier

Wide bandwidth: 1 MHz

No phase reversal

Low input currents: 4 pA

Unity gain stable

Rail-to-rail input and output

Qualified for automotive applications

APPLICATIONS

ASIC input or output amplifiers

Sensor interfaces

Piezoelectric transducer amplifiers

Medical instrumentation

Mobile communications

Audio outputs

Portable systems

GENERAL DESCRIPTION

The AD8541/AD8542/AD8544 are single, dual, and quad rail-

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

low supply current and 1 MHz bandwidth. All are guaranteed to

operate from a 2.7 V single supply as well as a 5 V supply. These

parts provide 1 MHz bandwidth at a low current consumption

of 45 μA per amplifier.

Very low input bias currents enable the AD8541/AD8542/AD8544

to be used for integrators, photodiode amplifiers, piezoelectric

sensors, and other applications with high source impedance.

The supply current is only 45 μA per amplifier, ideal for battery

operation.

Rail-to-rail inputs and outputs are useful to designers buffering

ASICs in single-supply systems. The AD8541/AD8542/AD8544

are optimized to maintain high gains at lower supply voltages,

making them useful for active filters and gain stages.

The AD8541/AD8542/AD8544 are specified over the extended

industrial temperature range (–40°C to +125°C). The AD8541

is available in 5-lead SOT-23, 5-lead SC70, and 8-lead SOIC

packages. The AD8542 is available in 8-lead SOIC, 8-lead MSOP,

and 8-lead TSSOP surface-mount packages. The AD8544 is

available in 14-lead narrow SOIC and 14-lead TSSOP surface-

mount packages. All MSOP, SC70, and SOT versions are available

in tape and reel only. See the Ordering Guide for automotive

models.

PIN CONFIGURATIONS

1

2

3

5

4 –IN A

+IN A

V+

OUT A

AD8541

V–

Figure 1. 5-Lead SC70 and 5-Lead SOT-23

(KS and RJ Suffixes)

NC

–IN A

+IN A

V–

V+

OUT A

NC

NC

1

2

3

4

8

7

6

5

AD8541

NC = NO CONNECT

Figure 2. 8-Lead SOIC

(R Suffix)

AD8542

1

2

3

4

8

7

6

5

OUT A

–IN A

+IN A

V–

+IN B

–IN B

OUT B

V+

Figure 3. 8-Lead SOIC, 8-Lead MSOP, and 8-Lead TSSOP

(R, RM, and RU Suffixes)

AD8544

1

2

3

4

14

13

12

11

OUT A

–IN A

+IN A

V+

V–

+IN D

–IN D

OUT D

5

6

7

10

9

8

+IN B

–IN B

OUT B

OUT C

–IN C

+IN C

Figure 4. 14-Lead SOIC and 14-Lead TSSOP

(R and RU Suffixes)