AD8221:  Precision Instrumentation Amplifier

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 ...More

AD8221:  Precision Instrumentation Amplifier

Product Description

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 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 this part 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 operates on both single and dual supplies and is well suited for applications where ±10 V input voltages are encountered.

The AD8221 is available in a low cost 8-lead SOIC and 8-lead MSOP, both of which offer the industry’s best performance. The MSOP requires half the board space of the SOIC, making it ideal for multichannel or space-constrained applications.

Performance is specified over the entire industrial temperature range of −40°C to +85°C for all grades. Furthermore, the AD8221 is operational from −40°C to +125°C*.

Applications

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

    • * See Typical Performance Characteristics for expected operation from 85°C to 125°C.

    Data Sheet, Rev. B, 9/07

    Features

    • Easy to use
    • Available in space-saving MSOP
    • Gain set with 1 external resistor (gain range 1 to 1000)
    • Operational up to 125°C*
    • Wide power supply range: ±2.3 V to ±18 V
    • Excellent AC specifications
      80 dB minimum CMRR to 10 kHz ( G = 1)
      825 kHz, –3 dB bandwidth (G = 1)
      2 V/μs slew rate

    * See Typical Performance Characteristics for expected operation from 85°C to 125°C.

    • Temperature range for specified performance: −40°C to +85°C
    • 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

    Diagrams

    AD8221 Diagram
    Pin Out Diagram for AD8221

    技术指标

    Single/Dual Supply Dual
    Voltage Supply (Vmax) ±18V
    Gain Setting Method Resistor
    Gain Range (min to max) 1000
    Bandwidth G=10 (kHz typ) 562kHz
    CMRR (dB) 80dB
    Vnoise RTI 1-10 Hz µVp-p 0.25µV p-p
    Temperature Range -40 to +85
    Supply Current (max) 1mA
    Vosi (µV) 60µV

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