Precision Instrumentation Amplifier
AD8221
CONNECTION DIAGRAM
FEATURES
Easy to use
1
2
3
4
8
7
6
5
+V
V
–IN
S
Available in space-saving MSOP
Gain set with 1 external resistor (gain range 1 to 1000)
Wide power supply range: 2.3 V to 18 V
Temperature range for specified performance:
−40°C to +85°C
R
G
OUT
R
REF
–V
G
+IN
S
AD8221
TOP VIEW
Operational up to 125°C1
Figure 1.
120
110
100
90
Excellent AC specifications
80 dB minimum CMRR to 10 kHz (G = 1)
825 kHz, –3 dB bandwidth (G = 1)
2 V/µs slew rate
AD8221
Low noise
8 nV/√Hz, @ 1 kHz, maximum input voltage noise
0.25 µV p-p input noise (0.1 Hz to 10 Hz)
High accuracy dc performance (AD8221BR)
90 dB minimum CMRR (G = 1)
25 µV maximum input offset voltage
0.3 µV/°C maximum input offset drift
0.4 nA maximum input bias current
COMPETITOR 1
80
70
60
COMPETITOR 2
50
40
10
100
1k
FREQUENCY (Hz)
10k
100k
APPLICATIONS
Weigh scales
Figure 2. Typical CMRR vs. Frequency for G = 1
Industrial process controls
Bridge amplifiers
Precision data acquisition systems
Medical instrumentation
Strain gages
Low voltage offset, low offset drift, low gain drift, high gain
accuracy, and high CMRR make this part an excellent choice
in applications that demand the best dc performance possible,
such as bridge signal conditioning.
Transducer interfaces
Programmable gain affords the user design flexibility. A single
resistor sets the gain from 1 to 1000. The AD8221 operates on
both single and dual supplies and is well suited for applications
where 10 V input voltages are encountered.
GENERAL DESCRIPTION
The AD8221 is a gain programmable, high performance
instrumentation amplifier that delivers the industry’s highest
CMRR over frequency in its class. The CMRR of instrumentation
amplifiers on the market today falls off at 200 Hz. In contrast,
the AD8221 maintains a minimum CMRR of 80 dB to 10 kHz
for all grades at G = 1. High CMRR over frequency allows the
AD8221 to reject wideband interference and line harmonics,
greatly simplifying filter requirements. Possible applications
include precision data acquisition, biomedical analysis, and
aerospace instrumentation.
The AD8221 is available in a low cost 8-lead SOIC and 8-lead
MSOP, both of which offer the industry’s best performance. The
MSOP requires half the board space of the SOIC, making it ideal
for multichannel or space-constrained applications.
Performance is specified over the entire industrial temperature
range of −40°C to +85°C for all grades. Furthermore, the AD8221
is operational from −40°C to +125°C1.
1 See Typical Performance Characteristics for expected operation from
85°C to 125°C.
Rev. C
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
rightsof third parties that may result fromits 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 andregisteredtrademarks 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 ©2003–2011 Analog Devices, Inc. All rights reserved.
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