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22 μA, RRIO, CMOS, 18 V
Operational Amplifier
Data Sheet
AD8546/AD8548
Rev. B
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 www.analog.com
Fax: 781.461.3113 ©2011–2012 Analog Devices, Inc. All rights reserved.
FEATURES
Micropower at high voltage: 22 μA maximum
Low input bias current: 20 pA maximum
Gain bandwidth product: 240 kHz
Slew rate: 80 V/ms
Large signal voltage gain: 110 dB minimum
Single-supply operation: 2.7 V to 18 V
Dual-supply operation: ±1.35 V to ±9 V
Unity-gain stable
APPLICATIONS
Portable medical equipment
Remote sensors
Transimpedance amplifiers
Current monitors
4 mA to 20 mA loop drivers
Buffer/level shifting
PIN CONFIGURATIONS
OUT A
1
–IN A
2
+IN A
3
V–
4
V+
8
OUT B
7
–IN B
6
+IN B
5
AD8546
TOP VIEW
(Not to Scale)
09585-001
Figure 1. AD8546 (8-Lead MSOP)
OUT A
1
–IN A
2
+IN A
3
V+
4
OUT D
14
–IN D
13
+IN D
12
V–
11
+IN B
5
+IN C
10
–IN B
6
–IN C
9
OUT B
7
OUT C
8
AD8548
TOP VIEW
(Not to Scale)
09585-103
Figure 2. AD8548 (14-Lead SOIC_N)
GENERAL DESCRIPTION
The AD8546 and AD8548 are dual and quad micropower, high
input impedance amplifiers optimized for low power and wide
operating supply voltage range applications.
The AD8546/AD8548 rail-to-rail input/output (RRIO) feature
provides increased dynamic range to drive low frequency data
converters, making these amplifiers ideal for dc gain and buffering
of sensor front ends or high impedance input sources used in
wireless or remote sensors or transmitters.
The low supply current specification (22 μA) of the AD8546/
AD8548 over a wide operating voltage range of 2.7 V to 18 V
or dual supplies (±1.35 V to ±9 V) makes these amplifiers useful
for a variety of battery-powered, portable applications, such as
ECGs, pulse monitors, glucose meters, smoke and fire detectors,
vibration monitors, and backup battery sensors.
The AD8546/AD8548 are specified over the extended industrial
temperature range of −40°C to +125°C. The AD8546 is available
in an 8-lead MSOP package; the AD8548 is available in a 14-lead
SOIC_N package.
Table 1. Micropower Op Amps
1
Amplifier
Supply Voltage
5 V 12 V to 18 V 36 V
Single AD8500 AD8663
AD8505
AD8541
AD8603
ADA4505-1
Dual AD8502 AD8546 OP295
AD8506 AD8657 ADA4062-2
AD8542 AD8667
AD8607 OP281
ADA4505-2
Quad AD8504 AD8548 OP495
AD8508 AD8669 ADA4062-4
AD8544 OP481
AD8609
ADA4505-4
1
See www.analog.com for the latest selection of micropower op amps.
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