Overview

Features and Benefits

  • Low input offset voltage:
    125 μV (maximum)
  • Low input offset voltage drift
    0.2 μV/°C (typical)
    1.5 μV/°C (maximum)
  • Ultralow supply current:
    495 μA/amplifier
  • Wide supply voltage range:
    3 V to 10 V
  • High speed performance
    −3 dB bandwidth: 105 MHz
    Slew rate: 160 V/μs
    0.1% settling time: 35 ns
  • Rail-to-rail outputs
  • Input common-mode range:
    −VS − 0.1 V to +VS − 1 V
  • Low noise: 5.9 nV/√Hz at 100 kHz; 0.6 pA/√Hz at 100 kHz
  • Low distortion: −102 dBc/−116 dBc HD2/HD3 at 100 kHz
  • Low input bias current:
    470 nA (typical)
  • Dynamic power scaling
    High speed turn-on time: 3 μs (maximum) fully settled
  • Small packaging
    6-lead SC70, 6-lead SOT-23

Product Details

The ADA4805-1 is a high speed voltage feedback rail-to-rail output amplifier with an exceptionally low quiescent current of 495 μA, making it ideal for low power, high resolution data conversion systems. Despite being low power, this amplifier provides excellent overall performance. It offers a high bandwidth of 105 MHz at a gain of 1, high slew rate of 160 V/μs, and a low input offset voltage of 125 μV maximum.

A shutdown pin allows further reduction of the quiescent supply current to 3 μA. For power sensitive applications, the shutdown mode offers very fast turn-on time of 3 μs from shutdown to fully on (output settled to 16 bits). This allows the user to dynamically manage the power of the amplifier by turning the amplifier off between ADC samples.

The Analog Devices, Inc., proprietary extra fast complementary bipolar (XFCB) process allows for both low voltage and low current noise (5.9 nV/√Hz, 0.6 pA/√Hz). The ADA4805-1 operates over a wide range of supply voltages from ±1.5 V to ±5 V, as well as from single 3 V and 5 V supplies, making it ideal for high speed, low power instruments.

The ADA4805-1 amplifier is available in both a 6-lead SOT-23 and a 6-lead SC70 package. These amplifiers are rated to work over the industrial temperature range of −40°C to +125°C.

Applications

  • High resolution, high precision ADC drivers
  • Battery-powered instrumentation
  • Micropower active filters
  • Portable point of sales terminals
  • Active RFID readers
  • Photo multipliers
  • ADC reference buffers

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