AD8290:  G = 50, CMOS Sensor Amplifier with Current Excitation

The AD8290 contains both an adjustable current source to drive a sensor and a difference amplifier to amplify the signal voltage. The amplifier is set for a fixed gain of 50. The AD8290 is an ...More

AD8290:  G = 50, CMOS Sensor Amplifier with Current Excitation

Product Description

The AD8290 contains both an adjustable current source to drive a sensor and a difference amplifier to amplify the signal voltage. The amplifier is set for a fixed gain of 50. The AD8290 is an excellent solution for both the drive and the sensing aspects required for pressure, temperature, and strain gage bridges.

In addition, because the AD8290 operates with low power, works with a range of low supply voltages, and is available in a low profile package, it is suitable for drive/sense circuits in portable electronics as well.

The AD8290 is available in a lead free 3.0 mm × 3.0 mm × 0.55 mm package and is operational over the industrial temperature range of −40°C to +85°C.

Applications

  • Bridge and sensor drives
  • Portable electronics

    • Data Sheet, Rev. B, 2/08

    Features

    • Supply voltage range: 2.6 V to 5.5 V
    • Low power
      1.2 mA + 2× excitation current
      0.5 μA shutdown current
    • Low input bias current: ± 100 pA
    • High CMRR: 120 dB
    • Space savings: 16-lead, 3.0 mm × 3.0 mm × 0.55 mm LFCSP
    • Excitation current
      300 μA to 1300 μA range
      Set with external resistor

    Diagrams

    AD8290 Diagram
    Functional Block Diagram for AD8290

    技术指标

    Voltage Supply (Vmax) +5.5V
    Gain Setting Method fixed
    Gain Range (min to max) 50
    CMRR (dB) 120dB
    Vnoise RTI 1-10 Hz µVp-p 0.75µV p-p
    Supply Current (max) 4.68mA

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