Low Power, Precision, Auto-Zero Op Amps
AD8538/AD8539
FEATURES
Low offset voltage: 13 μV maximum
Input offset drift: 0.03 μV/°C
Single-supply operation: 2.7 V to 5.5 V
High gain, CMRR, and PSRR
Low input bias current: 25 pA
Low supply current: 180 μA
PIN CONFIGURATIONS
OUT
V–
+IN
1
5
V+
AD8538
2
3
4
–IN
Figure 1. 5-Lead TSOT-23 (UJ-5)
APPLICATIONS
Mobile communications
Portable instrumentation
Battery-powered devices
Sensor interfaces
Temperature measurement
Electronic scales
NC
1
8
NC
V+
−IN
2
+IN
3
V−
4
AD8538
7
NC = NO CONNECT
Figure 2. 8-Lead SOIC_N (R-8)
GENERAL DESCRIPTION
The AD8538/AD8539 are very high precision amplifiers featuring
extremely low offset voltage, low input bias current, and low power
consumption. The supply current is less than 215 μA maximujm
per amplifier at 5.0 V. Operation is fully specified from 2.7 V to
5.0 V single supply (±1.35 V to ±2.5 V dual supply).
The AD8538/AD8539 operate at very low power making these
amplifiers ideal for battery-powered devices and portable
equipment.
The AD8538/AD8539 are specified over the extended industrial
temperature range (−40°C to +125°C). The AD8538 amplifier is
available in 5-lead TSOT-23, and 8-lead, narrow body SOIC
packages, and the AD8539 amplifier is available in 8-lead, narrow
body SOIC and 8-lead MSOP.
OUT A
1
–IN A
2
+IN A
3
8
V+
OUT B
+IN B
06741-033
06741-034
AD8539
7
6
5
TOP VIEW
(Not to Scale)
V–
4
–IN B
Figure 3. 8-Lead SOIC_N (R-8)
OUT A
1
–IN A
2
+IN A
3
V–
4
8
AD8539
TOP VIEW
(Not to Scale)
V+
OUT B
–IN B
+IN B
7
6
5
Figure 4. 8-Lead MSOP (RM-8)
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113 ©2005–2007 Analog Devices, Inc. All rights reserved.
06741-001
6
OUT
TOP VIEW
(Not to Scale)
5
NC
06741-002
TOP VIEW
(Not to Scale)
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