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AD85052

Operational Amplifiers Selection Guide

Analog Devices 

Precision Amplifiers (VOS < 1 mV, Bandwidth < 50 MHz)

Low Noise (Vn ≤ 10 nV/√Hz) Amplifiers

ADA4075-2: Ultralow Noise Amplifier at Lower Power

The ADA4075-2 is a dual, high performance, low noise operational amplifier combining excellent dc and ac characteristics on ADI’s iPolar® process.

ADI’s proprietary iPolar process is an advanced bipolar technology implementing vertical junction isolation with lateral trench isolation, allowing for low

noise performance amplifiers in smaller die size at faster speed and lower power.

Features

• Ultralow noise: 2.8 nV/√Hz at 1 kHz typical

• Ultralow distortion: 0.0002% typical

• Low supply current: 1.8 mA per amplifier typical

• Offset voltage: 1 mV maximum

• Bandwidth: 6.5 MHz typical

• Slew rate: 12 V/ms typical

• Unity-gain stable

Applications

• Precision instrumentation

• Professional audio

• Active filters

IN

C1

10 F

R1

10k

A1

1/2

ADA4075-2

R18

4.7k

R2

4.7k

C4

C5

R4

4.7k

50pF

R5

4.7k

A2

1/2

R13

100

ADA4075-2

R7

R6

250

R8 R9

4.7k FEEDBACK 100 4.7k

TRIM

50pF

R3

4.7k

A3

1/2

ADA4075-2

R10

4.7k

SYMMETRY

TRIM

R12

R11 4.7k

250 C6

TEST

R15

4.7k

50pF

A4

1/2

R14

100

ADA4075-2

C2

10 F

R16

100

R17

4.7k

NOTES

1. ALL RESISTORS SHOULD HAVE 1% TOLERANCE.

2. A1/A2 IN SAME PACKAGE; A3/A4 IN SAME PACKAGE.

OUT+

C3

10 F

OUT–

Balanced line driver design.

ADA4004-1/ADA4004-2/ADA4004-4: Ultraprecision, 1.8 nV/√Hz, 36 V Amplifiers

The ADA4004-1/ADA4004-2/ADA4004-4 are designed on the high performance iPolar process, enabling improvements such as reduced noise and power

consumption, increased speed and stability, and smaller footprint size. Novel design techniques enable the ADA4004-1/ADA4004-2/ADA4004-4 to achieve

1.8 nV/√Hz voltage noise density and a low 6 Hz 1/f noise corner frequency while consuming just 1.7 mA per amplifier. The small package saves board

space, reduces cost, and improves layout flexibility.

Features

• Very low voltage noise: 1.8 nV/√Hz

• Low input bias current: 90 nA maximum

• Offset voltage: 125 mV maximum

• High gain: 120 dB

• Wide bandwidth: 12 MHz

• 65 V to 615 V operation

Applications

• Precision instrumentation

• Filter blocks

• Microphone preamplifiers

• Industrial control

• Thermocouples and RTDs

250

ADA4004-4

VSY = ±15V

200

150

100

50

0

–55 –35 –15 5

25 45 65 85 105

VOS ( V)

Number of amplifiers vs. input offset voltage.

www.analog.com/opamps | 23

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