Analog Devices Inc. ADA4945-1 High Speed Fully Differential ADC Driver

Analog Devices Inc. ADA4945-1 High Speed, Fully Differential Analog to Digital Converter (ADC) Driver has low noise, low distortion, and a fully differential amplifier with two selectable power modes. The ADA4945-1 operates over a broad power supply range of 3V to 10V. The driver features low DC offset, DC offset drift, and excellent dynamic performance. This makes the ADA4945-1 well suited for various data acquisition and signal processing applications. This device is ideal for driving high-resolution, high-performance successive approximation registers (SAR). The ADA4945-1 ADC Driver is also suitable for Σ-Δ analog-to-digital converters (ADCs) on a 4mA of quiescent current (full power mode).


  • Broad power supply range: 3V to 10V
  • Wide input common-mode voltage range: -VS to +VS - 1.3V
  • Rail-to-rail output
  • Fully specified dual power mode operation
    • 4mA full power mode (145MHz)
    • 1.4mA low power mode (80MHz)
  • Full power mode
  • ±115µV maximum offset voltage from -40°C to +125°C
  • Low harmonic distortion
    • 133dBc HD2 and -140dBc HD3 at 1kHz
    • 133dBc HD2 and -116dBc HD3 at 100kHz
    • Fast settling time
      • 18-bit: 100ns
      • 16-bit: 50ns
    • Input voltage noise: 1.8nV/√Hz, f = 100kHz
  • Adjustable output clamps for ADC input protection


  • Low power Σ-Δ, PulSAR®, and SAR ADC drivers
  • Single-ended to differential converters
  • Differential buffers
  • Medical imaging
  • Process control
  • Portable electronics

Block Diagram

Block Diagram - Analog Devices Inc. ADA4945-1 High Speed Fully Differential ADC Driver
Published: 2019-04-29 | Updated: 2023-02-17