Amplifier detects low-level input signals

The AD8432 amplifier provides superior noise performance, lower per channel cost and nearly three times the bandwidth of competing products, according to ADI.

The combination of selectable gain and low noise enables the amplifier to detect and resolve low-level input signals.

Active impedance matching reduces signal reflection by matching signal-source and amplifier-input impedances without compromising input-noise performance.

By using the pin-strapping options, designers can select four gains: G=4, 8, 12 and 16.

At a gain of four, the amplifier's 200MHz bandwidth is said to be three times that of competing devices, while a 0.85nV/rtHz input referred voltage noise figure offers best-in-class noise performance.

ADI designed the AD8432 for communications infrastructure and medical ultrasound applications that require up to 200MHz of bandwidth combined with a high channel count and variable gains.

The common die and symmetrical design ensure precise phase matching between channels.

A single-ended-input amplifier, the AD8432 operates on a single 5V supply and provides a differential output optimised to drive ADI's AD8333 and AD8339 I/Q demodulators and phase shifters in medical ultrasound CW Doppler applications as well as a wide range of ADCs, such as ADI's AD7679 18-bit, 570 kSPS Pulsar converter and AD7952 14-bit, 1MSPS Pulsar converter.

AD8432 packaging features an exposed paddle that provides a low thermal-resistance path to the PCB, which enables efficient heat transfer and increases reliability.