AD8221AR Precision Instrumentation Amplifier Module

Overview

The AD8221AR is a gain programmable, high-performance instrumentation amplifier with the highest common mode rejection ratio (CMRR) relative to frequency in the industry. In today's market, CMRR of instrumentation amplifiers decays at 200 Hz. In contrast, the CMRR of all grades of the AD8221 is maintained at a minimum of 80 dB at G = 1 and at frequencies up to 10 kHz. The high common mode rejection ratio (CMRR) relative to the frequency allows the CJMCU-8221 to reject wideband interference and linear harmonics, greatly simplifying the filtering 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 common-mode rejection ratio make this device an excellent choice for applications requiring optimal dc performance, such as bridge signal conditioning. Programmable gain gives the user design flexibility. Through a resistor, gain can be set in the range of 1 to 1000. The CJMCU-8221 can be operated from a single or dual supply, making it ideal for applications where the input voltage is ± 10 V. The device is rated over the industrial temperature range of -40 ° C to + 85 ° C for all ratings. In addition, the AD8221 can operate from -40 ° C to + 125 ° C *.

Applications

Weigh scales
Industrial process controls
Bridge amplifiers
Precision data acquisition systems
Medical instrumentation
Strain gages
Transducer interfaces

Specifications

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
Operational up to 125°C1
80 dB minimum CMRR to 10 kHz (G = 1)
825 kHz, -3 dB bandwidth (G = 1)
2 V/μs slew rate
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