ADA4638-1 Datasheet, PDF (1/24 Pages) Analog Devices – 30 V Zero-Drift, Rail-to-Rail Output Precision Amplifier

Data Sheet
30 V Zero-Drift, Rail-to-Rail Output
Precision Amplifier
ADA4638-1
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
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.
PIN CONFIGURATIONS
ADA4638-1
NC 1
–IN 2
+IN 3
V– 4
TOP VIEW
(Not to Scale)
8 NC
7 V+
6 OUT
5 NC
NOTES
1. NC = NO CONNECT. DO NOT
CONNECT TO THIS PIN.
Figure 1. 8-Lead SOIC
ADA4638-1
NC 1
–IN 2
+IN 3
V– 4
TOP VIEW
(Not to Scale)
8 NC
7 V+
6 OUT
5 NC
NOTES
1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN.
2. IT IS RECOMMENDED THAT THE EXPOSED PAD BE
CONNECTED TO V–.
Figure 2. 8-Lead LFCSP
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
16 V
Single AD8638 9
0.06
Dual AD8639 9
0.06
5V
Single ADA4528-1 2.5
0.015
AD8628 5
0.02
AD8538 13
0.1
ADA4051-1 15
0.1
Dual AD8629 5
0.02
AD8539 13
0.1
ADA4051-2 15
0.1
Quad AD8630 5
0.02
Rev. 0
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