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AD623:  Single Supply, Rail-Rail, Low Cost Instrumentation Amplifier

The AD623 is an integrated single-supply instrumentation amplifier that delivers rail-to-rail output swing on a 3 V to 12 V supply. The AD623 offers superior user flexibility by allowing single gain set resistor programming and by conforming to the 8-lead industry standard pinout configuration. With no external resistor, the AD623 is configured for unity gain (G = 1), and with an external ...More

AD623:  Single Supply, Rail-Rail, Low Cost Instrumentation Amplifier

Product Description

The AD623 is an integrated single-supply instrumentation amplifier that delivers rail-to-rail output swing on a 3 V to 12 V supply. The AD623 offers superior user flexibility by allowing single gain set resistor programming and by conforming to the 8-lead industry standard pinout configuration. With no external resistor, the AD623 is configured for unity gain (G = 1), and with an external resistor, the AD623 can be programmed for gains up to 1000.

The AD623 holds errors to a minimum by providing superior ac CMRR that increases with increasing gain. Line noise, as well as line harmonics, are rejected because the CMRR remains constant up to 200 Hz. The AD623 has a wide input common-mode range and can amplify signals that have a common-mode voltage 150 mV below ground. Although the design of the AD623 was optimized to operate from a single supply, the AD623 still provides superior performance when operated from a dual voltage supply (±2.5 V to ±6.0 V).

Low power consumption (1.5 mW at 3 V), wide supply voltage range, and rail-to-rail output swing make the AD623 ideal for battery-powered applications. The rail-to-rail output stage maximizes the dynamic range when operating from low supply voltages. The AD623 replaces discrete instrumentation amplifier designs and offers superior linearity, temperature stability, and reliability in a minimum of space.

Applications

  • Low power medical instrumentation
  • Transducer interfaces
  • Thermocouple amplifiers
  • Industrial process controls
  • Difference amplifiers
  • Low power data acquisition

    • Data Sheet, Rev D, 07/2008

    RESOURCES & TOOLS

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    • Easy to use
    • Higher performance than discrete design
    • Single-supply and dual-supply operation
    • Rail-to-rail output swing
    • Input voltage range extends 150 mV below ground (single supply)
    • Low power, 550 µA max supply current
    • Gain set with one external resistor, gain range 1 (no resistor) to 1,000
    • High Accuracy DC Performance
      0.10% gain accuracy (G = 1)
      0.35% gain accuracy (G >1)
      10 ppm gain drift (G = 1)
      25 nA maximum input bias current
    • Excellent AC Specifications
      90 dB minimum CMRR (G = 10); 70 dB minimum CMRR (G = 1) at 60 Hz, 1kΩ source imbalance)
      800 kHz bandwidth (G = 1)
      20 µs settling time to 0.01% (G = 10)
    • Noise
      35 nV/√vHz RTI noise @ 1 kHz (G = 1)
    • Single/Dual Supply: Single/Dual
    • Voltage Supply (Vmax) : ±6V
    • Gain Setting Method: Resistor
    • Gain Range (min to max): 1000
    • Bandwidth G=10 (kHz typ): 100kHz
    • CMRR (dB): 90dB
    • Vnoise RTI 1-10 Hz µVp-p : 2µV p-p
    • Temperature Range: -40 to +85
    • Gain Error (%) max: +0.35%
    • Supply Current : 0.55mA
    • Package: DIP,MSOP,SOIC
    • Vosi (µV): 25µV

    Pin Configuration Diagram for AD623

    AD623 Diagram
    Pin Configuration Diagram for AD623

    OF NOTE ...

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