GENERAL DESCRIPTION
The AD8432 is a dual-channel, low power, ultralow noise amplifier with selectable gain and active impedance matching. Each channel has a single-ended input, differential output, and integrated input clamps. By pin strapping the gain setting pins, four accurate gains of G = 12.04 dB, 18.06 dB, 21.58 dB, and 24.08 dB (×4, ×8, ×12, and ×16, respectively) are possible. A bandwidth of 200 MHz at G = 12.04 dB makes this amplifier well suited for many high speed applications.

FEATURES
   Low noise
      Input voltage noise: 0.85 nV/√Hz
      Current noise: 2.0 pA/√Hz
   High speed
      200 MHz bandwidth (G = 12.04 dB)
      295 V/μs slew rate
   Selectable gain
      G = 12.04 dB (×4)
      G = 18.06 dB (×8)
      G = 21.58 dB (×12)
      G = 24.08 dB (×16)
   Active input impedance matching
   Integrated input clamp diodes
   Single-ended input, differential output
   Supply range: 4.5 V to 5.5 V
   Low power: 60 mW/channel

APPLICATIONS
   CW Doppler ultrasound front ends
   Low noise preamplification
   Predriver for I/Q demodulators and phase shifters
   Wideband analog-to-digital drivers