AD8221-KGD Datasheet

• Easy to use
• Gain set with 1 external resistor (gain range 1 to 1000)
• Wide power supply operating range: ±2.3 V to ±18 V
• Temperature range for specified performance: −40°C to +85°C
• Operational up to 125°C
• Excellent ac specifications
  • 80 dB minimum CMRR to 10 kHz (gain = 1)
  • 825 kHz typical, small signal –3 dB bandwidth (gain = 1)
  • 2 V/µs typical slew rate (gain = 1)
• Low noise
  • 8 nV/√Hz maximum input voltage noise at 1 kHz
  • 0.25 µV p-p typical RTI noise (gain = 100 to 1000)
• High accuracy dc performance
  • 80 dB minimum CMRR dc to 60 Hz with 1 kΩ source impedance (gain = 1)
  • 70 µV maximum input offset voltage
  • 0.9 µV/°C maximum input offset voltage, average temperature coefficient
  • 1.5 nA maximum input bias current
  • Known Good Die (KGD): these die are fully guaranteed to data sheet specifications.

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

The AD8221-KGD is a gain programmable, high performance instrumentation amplifier (in-amp) that delivers high CMRR over frequency. High CMRR over frequency allows the AD8221-KGD to reject wideband interference and line harmonics, greatly simplifying filter requirements. The AD8221-KGD maintains a minimum common-mode rejection ratio (CMRR) of 80 dB to 10 kHz at a gain = 1. 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-KGD operates on both single and dual supplies and is well suited for applications where ±10 V input voltages are encountered.

The AD8221-KGD is available in an 8-pad bare die, making it ideal for multichannel or space-constrained applications.

Performance is specified over the −40°C to +85°C industrial temperature range. Furthermore, the AD8221-KGD is operational from −40°C to +125°C.

Additional application and technical information can be found in the AD8221 data sheet.