30 V Zero-Drift, Rail-to-Rail Output
Precision Amplifier
Data Sheet
ADA4638-1
FEATURES
PIN CONFIGURATIONS
ADA4638-1
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
NC
–IN
+IN
V–
1
2
3
4
8
7
6
5
NC
V+
TOP VIEW
(Not to Scale)
OUT
NC
NOTES
High PSRR: 120 dB minimum
High CMRR: 130 dB minimum
1. NC = NO CONNECT. DO NOT
CONNECT TO THIS PIN.
Input common-mode range includes lower supply rail
Rail-to-rail output
Low supply current: 0.95 mA maximum
Figure 1. 8-Lead SOIC
ADA4638-1
NC
–IN
+IN
V–
1
2
3
4
8
7
6
5
NC
V+
APPLICATIONS
TOP VIEW
(Not to Scale)
OUT
NC
Electronic weigh scale
Pressure and position sensors
Strain gage amplifiers
NOTES
1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN.
2. IT IS RECOMMENDED THAT THE EXPOSED PAD BE
CONNECTED TO V–.
Medical instrumentation
Thermocouple amplifiers
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 ±±.±5 V to ±15 V
dual supplies while consuming less than 0.95 mA of supply
current at ±5 V.
Table 1. Analog Devices, Inc., Zero-Drift Op Amp Portfolio
Offset
Voltage
(μV) Max (μV/°C) Max
Offset
Voltage Drift
Operating
Voltage
Type
Product
30 V
16 V
Single ADA4638-1 4.5
0.08
0.06
0.06
0.015
0.02
0.1
Single AD8638
Dual AD8639
9
9
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.± 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).
5 V
Single ADA4528-1 2.5
AD8628
AD8538
5
13
ADA4051-1 15
0.1
Dual
AD8629
AD8539
5
0.02
0.1
13
ADA4051-2 15
Quad AD8630
0.1
5
0.02
The ADA4638-1 is specified for the extended industrial (−40°C
to +1±5°C) temperature range and is available in 8-lead LFCSP
(3 mm × 3 mm) and SOIC packages.
Rev. 0
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