24 MHz Rail-to-Rail

Dual Amplifier

AD8646

Rev. 0

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FEATURES

Offset voltage: 2.5 mV maximum

Single-supply operation: 2.7 V to 5.5 V

Low noise: 8 nV/√Hz

Wide bandwidth: 24 MHz

Slew rate: 12 V/μs

Short-circuit output current: 150 mA

No phase reversal

Low input bias current: 1 pA

Low supply current: 2 mA maximum

Unity gain stable

APPLICATIONS

Battery-powered instruments

Multipole filters

ADC front ends

Sensors

Barcode scanners

ASIC input or output amplifiers

Audio amplifiers

Photodiode amplifiers

Datapath/mux/switch control

PIN CONFIGURATION

V+

8

OUTB

7

–INB

6

+INB

5

AD8646

TOP VIEW

(Not to Scale)

Figure 1.

GENERAL DESCRIPTION

The AD8646 is a dual, rail-to-rail, input and output, single-

supply amplifier featuring low offset voltage, wide signal

bandwidth, low input voltage, and low current noise.

The combination of 24 MHz bandwidth, low offset, low noise,

and very low input bias current makes these amplifiers useful in

a wide variety of applications. Filters, integrators, photodiode

amplifiers, and high impedance sensors all benefit from the

combination of performance features. AC applications benefit

from the wide bandwidth and low distortion. This amplifier

offers high output drive capability, which is excellent for audio

line drivers and other low impedance applications.

Applications include portable and low powered instrumenta-

tion, audio amplification for portable devices, portable phone

headsets, barcode scanners, and multipole filters. The ability to

swing rail to rail at both the input and output enables designers

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

swing devices in single-supply systems.