30 V Zero-Drift, Rail-to-Rail Output

Precision Amplifier

Data Sheet

ADA4638-1

Rev. 0

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FEATURES

Single supply operation: 4.5 V to 30 V

Dual supply operation: ±2.25 V to ±15 V

Low offset voltage: 4 μV maximum

Input offset voltage drift: 0.05 μV/°C maximum

High gain: 130 dB minimum

High PSRR: 120 dB minimum

High CMRR: 130 dB minimum

Input common-mode range includes lower supply rail

Rail-to-rail output

Low supply current: 0.95 mA maximum

APPLICATIONS

Electronic weigh scale

Pressure and position sensors

Strain gage amplifiers

Medical instrumentation

Thermocouple amplifiers

PIN CONFIGURATIONS

NC

8

V+

7

OUT

6

NC

5

NOTES

1. NC = NO CONNECT. DO NOT

CONNECT TO THIS PIN.

ADA4638-1

TOP VIEW

(Not to Scale)

Figure 1. 8-Lead SOIC

ADA4638-1

TOP VIEW

(Not to Scale)

NOTES

1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN.

2. IT IS RECOMMENDED THAT THE EXPOSED PAD BE

CONNECTED TO V–.

3

+IN

4

V–

1

NC

2

–IN

6OUT

5NC

8NC

7V+

Figure 2. 8-Lead LFCSP

GENERAL DESCRIPTION

The ADA4638-1 is a high voltage, high precision, zero-drift

amplifier featuring rail-to-rail output swing. It is guaranteed to

operate from 4.5 V to 30 V single supply or ±2.25 V to ±15 V

dual supplies while consuming less than 0.95 mA of supply

current at ±5 V.

With an offset voltage of 4 μV, offset drift less than 0.05 μV/°C,

no 1/f noise, and input voltage noise of only 1.2 μV p-p (0.1 Hz

to 10 Hz), the ADA4638-1 is suited for high precision applications

where large error sources cannot be tolerated. Pressure sensors,

medical equipment, and strain gage amplifiers benefit greatly

from nearly zero drift over the wide operating temperature

range. Many applications can take advantage of the rail-to-rail

output swing provided by the ADA4638-1 to maximize the signal-

to-noise ratio (SNR).

The ADA4638-1 is specified for the extended industrial (−40°C

to +125°C) temperature range and is available in 8-lead LFCSP

(3 mm × 3 mm) and SOIC packages.

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

Operating

Voltage

Type

Product

Offset

Voltage

(μV) Max

Offset

Voltage Drift

(μV/°C) Max

30 V

Single

ADA4638-1

4.5

0.08

Single

AD8638

9

0.06

16 V

Dual

AD8639

9

0.06

ADA4528-1

2.5

0.015

AD8628

5

0.02

AD8538

13

0.1

Single

ADA4051-1

15

0.1

AD8629

5

0.02

AD8539

13

0.1

Dual

ADA4051-2

15

0.1

5 V

Quad

AD8630

5

0.02