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Low-noise opamp

THS4531AIDGK General Description

The THS4531AIDGK is a low-power, fully differential amplifier specifically designed for low-power data acquisition systems and high-density applications where power consumption and dissipation is critical. With an input common-mode range below the negative rail and rail-to-rail output, this device features accurate output common-mode control that allows for easy interface from single-ended ground-referenced signal sources to successive-approximation registers (SARs) and delta-sigma (ΔΣ) ADCs using only single-supply 2.5-V to 5-V power. Moreover, the THS4531A is a valuable tool for general-purpose, low-power differential signal conditioning applications

Key Features

  • THS4531AIDGK is a high-speed voltage-feedback operational amplifier
  • It has a wide output voltage swing of ±13 V
  • The amplifier has a high slew rate of 2250 V/µs
  • It offers a high bandwidth of 1.2 GHz
  • The THS4531AIDGK features a low distortion for high-performance applications
  • Application

    • Medical imaging technology
    • Radar system integration
    • High-speed instrumentation


    Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 2.5
    Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 5.5 BW at Acl (MHz) 36
    Acl, min spec gain (V/V) 1 Slew rate (typ) (V/µs) 220
    Architecture Bipolar, Fully Differential ADC Driver Vn at flatband (typ) (nV√Hz) 10
    Iq per channel (typ) (mA) 0.25 Rail-to-rail In to V-, Out
    Vos (offset voltage at 25°C) (max) (mV) 0.4 Operating temperature range (°C) -40 to 125
    Iout (typ) (mA) 26 2nd harmonic (dBc) 129
    3rd harmonic (dBc) 138 Frequency of harmonic distortion measurement (MHz) 0.001
    GBW (typ) (MHz) 27 Input bias current (max) (pA) 250000
    Features Shutdown CMRR (typ) (dB) 116
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