Datasheet AD8221 (Analog Devices)

Precision Instrumentation Amplifier AD8221
FEATURES CONNECTION DIAGRAM Easy to use 1 –IN 8 +V Available in space-saving MSOP S R 2 7 V Gain set with 1 external resistor (gain range 1 to 1000) G OUT R 3 6 REF Wide power supply range: ±2.3 V to ±18 V G +IN 4 5 –V
1 0
Temperature range for specified performance: S AD8221
-0 9 4 1 3
−40°C to +85°C TOP VIEW
0
Operational up to 125°C
1

Figure 1.
Excellent AC specifications 120 80 dB minimum CMRR to 10 kHz (G = 1) 110 825 kHz, –3 dB bandwidth (G = 1) AD8221 2 V/µs slew rate 100 Low noise 90 ) 8 nV/√Hz, @ 1 kHz, maximum input voltage noise B (d COMPETITOR 1 0.25 µV p-p input noise (0.1 Hz to 10 Hz) R 80 High accuracy dc performance (AD8221BR) MR C 70 90 dB minimum CMRR (G = 1) 25 µV maximum input offset voltage 60 0.3 µV/°C maximum input offset drift COMPETITOR 2 50 0.4 nA maximum input bias current 40
2
10 100 1k 10k 100k
0
APPLICATIONS
-0 9 4 1
FREQUENCY (Hz)
3 0
Weigh scales
Figure 2. Typical CMRR vs. Frequency for G = 1
Industrial process controls Bridge amplifiers Precision data acquisition systems
Low voltage offset, low offset drift, low gain drift, high gain
Medical instrumentation
accuracy, and high CMRR make this part an excellent choice
Strain gages
in applications that demand the best dc performance possible,
Transducer interfaces
such as bridge signal conditioning.

Programmable gain affords the user design flexibility. A single
GENERAL DESCRIPTION
resistor sets the gain from 1 to 1000. The AD8221 operates on The AD8221 is a gain programmable, high performance both single and dual supplies and is well suited for applications instrumentation amplifier that delivers the industry’s highest where ±10 V input voltages are encountered. CMRR over frequency in its class. The CMRR of instrumentation The AD8221 is available in a low cost 8-lead SOIC and 8-lead amplifiers on the market today falls off at 200 Hz. In contrast, MSOP, both of which offer the industry’s best performance. The the AD8221 maintains a minimum CMRR of 80 dB to 10 kHz MSOP requires half the board space of the SOIC, making it ideal for all grades at G = 1. High CMRR over frequency allows the for multichannel or space-constrained applications. AD8221 to reject wideband interference and line harmonics, greatly simplifying filter requirements. Possible applications Performance is specified over the entire industrial temperature include precision data acquisition, biomedical analysis, and range of −40°C to +85°C for all grades. Furthermore, the AD8221 aerospace instrumentation. is operational from −40°C to +125°C1. 1 See Typical Performance Characteristics for expected operation from 85°C to 125°C.
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