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