Low Power, 3.6 MHz, Low Noise, Rail-to-

Rail Output, Operational Amplifiers

ADA4691-2/ADA4691-4/ADA4692-2/ADA4692-4

Rev. D

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FEATURES

Low power: 180 μA typical

Very low input bias currents: 0.5 pA typical

Low noise: 16 nV/√Hz typical

3.6 MHz bandwidth

Offset voltage: 500 μV typical

Low offset voltage drift: 4 μV/°C maximum

Low distortion: 0.003% THD + N

2.7 V to 5 V single supply or ±1.35 V to ±2.5 V dual supply

Available in very small 2 mm × 2 mm LFCSP packages

APPLICATIONS

Photodiode amplifiers

Sensor amplifiers

Portable medical and instrumentation

Portable audio: MP3s, PDAs, and smartphones

Communications

Low-side current sense

ADC drivers

Active filters

Sample-and-hold

GENERAL DESCRIPTION

The ADA4691-2/ADA4692-2 are dual and the ADA4691-4/

ADA4692-4 are the quad rail-to-rail output, single-supply

amplifiers featuring low power, wide bandwidth, and low noise.

The ADA4691-2 has two independent shutdown pins, allowing

further reduction in supply current. The ADA4691-4 is a quad

with dual shutdown pins each controlling a pair of amplifiers

and is available in the 16-lead LFCSP. The ADA4692-4 is a quad

version without shutdown.

These amplifiers are ideal for a wide variety of applications.

Audio, filters, photodiode amplifiers, and charge amplifiers, all

benefit from this combination of performance and features.

Additional applications for these amplifiers include portable

consumer audio players with low noise and low distortion that

provide high gain and slew rate response over the audio band at

low power. Industrial applications with high impedance sensors,

such as pyroelectric and IR sensors, benefit from the high

impedance and low 0.5 pA input bias, low offset drift, and

enough bandwidth and response for low gain applications.

The ADA4691/ADA4692 family is fully specified over the extended

industrial temperature range (−40°C to +125°C). The ADA4691-2

is available in a 10-lead LFCSP and a 9-ball WLCSP. The ADA4692-2

is available in an 8-lead SOIC and 8-lead LFCSP. The ADA4691-4 is

available in a 16-lead LFCSP. The ADA4692-4 is available in a 14-lead

TSSOP. For pin configurations, see the Pin Configurations section.

1

0.1

0.01

0.001

10

100

1k

10k

20k

FREQUENCY (Hz)

ADA4692-2

Figure 1. THD + Noise vs. Frequency

–80

–90

–100

–110

–120

–130

–140

100

1k

10k

100k

FREQUENCY (Hz)

ADA4692-2

Figure 2. Channel Separation vs. Frequency

Table 1.

Micropower

Low Power

Low Power with Shutdown

Standard Op Amp With Shutdown

High Bandwidth

Single

AD8613

AD8591

AD8691

Dual

AD8617

ADA4692-2

ADA4691-2

AD8592

AD8692

Quad

AD8619

ADA4692-4

ADA4691-4

AD8594

AD8694