Precision Instrumentation Amplifier
Enhanced Product
AD8221-EP
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FEATURES
Specified from −55°C to +125°C
0.9 μV/°C maximum input offset average TC
10 ppm/°C maximum gain vs. temperature (G = 1)
Excellent ac specifications
80 dB minimum CMRR at 10 kHz (G = 1)
–3 dB bandwidth: 825 kHz typical (G = 1)
2 V/μs typical slew rate
Low noise
8 nV/√Hz, at 1 kHz, maximum input voltage noise
0.25 μV p-p RTI (G = 100 to 1000)
High accuracy dc performance
80 dB minimum CMRR DC to 60 Hz (G = 1)
70 μV maximum input offset voltage
2 nA maximum input bias current
Wide power supply range: ±2.3 V to ±18 V
Available in space-saving MSOP
Gain set with 1 external resistor (gain range 1 to 1000)
ENHANCED PRODUCT FEATURES
Supports defense and aerospace applications (AQEC standard)
Military temperature range (−55°C to +125°C)
Controlled manufacturing baseline
One assembly/test site
One fabrication site
Enhanced product change notification
Qualification data available on request
APPLICATIONS
Bridge amplifiers
Precision data acquisition systems
Strain gages
Transducer interfaces
TYPICAL CONNECTION DIAGRAM
8
7
6
5
1
2
3
4
–IN
R
G
R
G
+V
S
V
OUT
REF
–V
S
IN
TOP VIEW
D8221-EP
03149-001
Figure 1.
GENERAL DESCRIPTION
The AD8221-EP 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-EP maintains a minimum CMRR of 80 dB to 10 kHz at
G = 1. High CMRR over frequency allows the AD8221-EP to
reject wideband interference and line harmonics, greatly
simplifying filter requirements.
Possible applications include precision data acquisition, biomedical
analysis, and aerospace instrumentation.
Low voltage offset, low offset drift, low gain drift, high gain
accuracy, and high CMRR make this device an excellent choice
in applications that demand the best dc performance possible, such
as bridge signal conditioning.
Programmable gain affords the user design flexibility. A single
resistor sets the gain from 1 to 1000. The AD8221-EP operates
on both single and dual supplies and is well suited for applications
where ±10 V input voltages are encountered.
The AD8221-EP is specified over the −55°C to +125°C military
temperature range. It is available in an 8-lead MSOP package.
Additional application and technical information can be found
in the AD8221 data sheet.
40
50
60
70
80
90
CMRR (dB)
100
110
120
FREQUENCY (Hz)
10010 1k 10k 100k
AD8221-EP
COMPETITOR 1
COMPETITOR 2
13702-002
Figure 2. Typical CMRR vs. Frequency for G = 1
