Precision, Ultralow Noise, RRIO,

Zero-Drift Op Amp

Data Sheet

ADA4528-1/ADA4528-2

Rev. D

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FEATURES

Low offset voltage: 2.5 µV maximum

Low offset voltage drift: 0.015 μV/°C maximum

Low noise

Open-loop gain: 130 dB minimum

CMRR: 135 dB minimum

PSRR: 130 dB minimum

Unity-gain crossover: 4 MHz

−3 dB closed-loop bandwidth: 6.2 MHz

Single-supply operation: 2.2 V to 5.5 V

Dual-supply operation: ±1.1 V to ±2.75 V

Rail-to-rail input and output

Unity-gain stable

APPLICATIONS

Thermocouple/thermopile

Load cell and bridge transducers

Precision instrumentation

Electronic scales

Medical instrumentation

Handheld test equipment

GENERAL DESCRIPTION

The ADA4528-1/ADA4528-2 are ultralow noise, zero-drift

operational amplifiers featuring rail-to-rail input and output

swing. With an offset voltage of 2.5 μV, offset voltage drift of

0.015 μV/°C, and typical noise of 97 nV p-p (0.1 Hz to 10 Hz,

applications in which error sources cannot be tolerated.

The ADA4528-1/ADA4528-2 have a wide operating supply range

of 2.2 V to 5.5 V, high gain, and excellent CMRR and PSRR

specifications, which make it ideal for applications that require

precision amplification of low level signals, such as position and

pressure sensors, strain gages, and medical instrumentation.

The ADA4528-1/ADA4528-2 are specified over the extended

industrial temperature range (−40°C to +125°C). The ADA4528-1

and ADA4528-2 are available in 8-lead MSOP and 8-lead

LFCSP packages.

For more information about the ADA4528-1/ADA4528-2,

see the AN-1114 Application Note, Lowest Noise Zero-Drift

Amplifier Has 5.6 nV/√Hz Voltage Noise Density.

PIN CONNECTION DIAGRAMS

NIC

1

–IN

2

+IN

3

V–

4

NIC

8

V+

7

OUT

6

NIC

5

NOTES

1. NIC = NO INTERNAL CONNECTION.

ADA4528-1

TOP VIEW

(Not to Scale)

Figure 1. ADA4528-1 Pin Configuration, 8-Lead MSOP

ADA4528-1

TOP VIEW

(Not to Scale)

3

+IN

4

V–

1

NIC

2

–IN

6 OUT

5 NIC

8 NIC

7 V+

NOTES

1. NIC = NO INTERNAL CONNECTION.

2. CONNECT THE EXPOSED PAD TO

V– OR LEAVE IT UNCONNECTED.

Figure 2. ADA4528-1 Pin Configuration, 8-Lead LFCSP

For ADA4528-2 pin connections and for more information about

the pin connections for these products, see the Pin Configurations

and Function Descriptions section.

1

10

100

1

10

100

1k

10k

100k

1M

10M

FREQUENCY (Hz)

Figure 3. Voltage Noise Density vs. Frequency

Table 1. Analog Devices, Inc., Zero-Drift Op Amp Portfolio1

Type

Ultralow

Noise

Micropower

(<20 µA)

Low

Power

(<1 mA)

16 V

Operating

Voltage

30 V

Operating

Voltage

Single ADA4528-1 ADA4051-1 AD8628 AD8638

ADA4638-1

AD8538

Dual

ADA4528-2 ADA4051-2 AD8629 AD8639

AD8539

Quad

AD8630

1

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