Catalog
Low Cost Instrumentation Amplifier
Key Features
• Easy to use
• Low cost solution
• Higher performance than two or three op amp design
• Unity gain with no external resistor
• Optional gains with one external resistor(Gain range: 2 to 1000)
• Wide power supply range: ±2.6 V to ±15 V
• Available in 8-lead PDIP and 8-lead SOIC_N packages
• Low power, 1.5 mA maximum supply current
• DC performance0.15% gain accuracy: G = 1125 μV maximum input offset voltage1.0 μV/°C maximum input offset drift5 nA maximum input bias current66 dB minimum common-mode rejection ratio: G = 1
• Noise12 nV/√Hz @ 1 kHz input voltage noise0.60 μV p-p noise: 0.1 Hz to 10 Hz, G = 10
• AC characteristics800 kHz bandwidth: G = 1010 μs settling time to 0.1% @ G = 1 to 1001.2 V/μs slew rate
Description
AI
The AD622 is a low cost, moderately accurate instrumentation amplifier in the traditional pin configuration that requires only one external resistor to set any gain between 2 and 1000. For a gain of 1, no external resistor is required. The AD622 is a complete difference or subtractor amplifier system that also provides superior linearity and common-mode rejection by incorporating precision laser-trimmed resistors.The AD622 replaces low cost, discrete, two or three op amp instrumentation amplifier designs and offers good common-mode rejection, superior linearity, temperature stability, reliability, power, and board area consumption. The low cost of the AD622 eliminates the need to design discrete instrumentation amplifiers to meet stringent cost targets. While providing a lower cost solution, it also provides performance and space improvements.ApplicationsTransducer interfaceLow cost thermocouple amplifierIndustrial process controlsDifference amplifierLow cost data acquisition
