Precision, Ultralow Noise, RRIO,

Zero-Drift Op Amp

Data Sheet

ADA4528-1/ADA4528-2

Rev. F

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FEATURES

Low offset voltage: 2.5 µV maximum

Low offset voltage drift: 0.015 μV/°C maximum

Low noise

5.6 nV/√Hz at f = 1 kHz, AV = +100

97 nV p-p at f = 0.1 Hz to 10 Hz, AV = +100

Open-loop gain: 130 dB minimum

CMRR: 135 dB minimum

PSRR: 130 dB minimum

Unity-gain crossover: 4 MHz

Gain bandwidth product: 3 MHz at AV = +100

−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,

AV = +100), the ADA4528-1/ADA4528-2 are well suited for

applications in which error sources cannot be tolerated.

TheADA4528-1/ADA4528-2 have a wide operating supply range

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

cations, 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). TheADA4528-1

andADA4528-2 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)

VSY = 5V

VCM = VSY/2

AV = 1

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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