AD8221 Precision Instrumentation Amplifier

AD8221ARZ Precision Instrumentation Amplifier IC

AD8221ARZ Precision Instrumentation Amplifier IC

The AD8221 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 maintains a minimum CMRR of 80 dB to 10 kHz for all grades at G = 1. High CMRR over frequency allows the AD8221 IC 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 AD8221 IC 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 AD8221ARZ Precision Instrumentation Amplifier operates on both single and dual supplies and is well suited for applications where ±10 V input voltages are encountered.

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Features of AD8221ARZ Precision Instrumentation Amplifier

• Easy to use
  
• Available in space-saving MSOP
• 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
• Excellent AC specifications
• 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 

Features of MAX6675 IC

• Direct Digital Conversion of Type K Thermocouple Output
• Cold-Junction Compensation
• Simple SPI-Compatible Serial Interface
• 12-Bit, 0.25°C Resolution
• Open Thermocouple Detection

Application of MAX6675 K-Thermocouple to Digital Converter

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

Related Links

• AD8221 Instrumentation IC Datasheet

Package Includes

1 x AD8221 Precision Instrumentation Amplifier