Low Noise, Low Input Bias Current, Rail-to-Rail

Output, JFET Dual Operational Amplifier

Data Sheet

ADA4001-2

Rev. B

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FEATURES

Low T

Low input bias current: 20 pA typical at V

Low noise

7.7 nV/√Hz typical at f = 1 kHz

1.2 µV rms at 20 Hz to 20 kHz

Low distortion: 0.00006%

No phase reversal

Rail-to-rail output

Unity-gain stable

APPLICATIONS

Instrumentation

Medical instruments

Multipole filters

Precision current measurement

Photodiode amplifiers

Sensors

Audio

PIN CONFIGURATION

V–

4

V+

8

OUT B

7

–IN B

6

+IN B

5

ADA4001-2

TOP VIEW

(Not to Scale)

Figure 1. 8-Lead SOIC_N (R Suffix)

GENERAL DESCRIPTION

The ADA4001-2 is a dual channel JFET amplifier that features

low input voltage noise and current noise, input bias current,

and rail-to-rail output.

The combination of low noise and low input bias current makes

this amplifier especially suitable for high impedance sensor

amplification. With low noise and fast settling times, the

ADA4001-2 provides good accuracy for medical instruments,

electronic measurement, and automated test equipment. Unlike

many competitive amplifiers, the ADA4001-2 maintains fast

settling performance even with substantial capacitive loads,

and, unlike many older JFET amplifiers, the ADA4001-2 does

not suffer from output phase reversal when input voltages

exceed the maximum common-mode voltage range.

With fast slew rate and great stability under capacitive loads, the

ADA4001-2 is a good fit for filter applications. With low input

bias currents and noise, it offers a wide dynamic range for photodi-

ode amplifier circuits. Low noise and distortion, along with

high output current and excellent speed, make the ADA4001-2

a great choice for audio applications.

The ADA4001-2 is specified over the −40°C to +125°C extended

industrial temperature range.

The ADA4001-2 is available in an 8-lead narrow SOIC package.