Description

The D88347T is a dual channel, low noise variable gain amplifier optimized for use in ultrasound imaging systems. It provides very precise gain control, low noise and distortion, and a wide bandwidth. The D88347T offers two independent gain ranges, with the AD600 providing a gain of 0 dB to +40 dB and the AD602 providing a gain of -10 dB to +30 dB. Both channels have an input noise spectral density of 1.4 nV/√Hz, but the AD602 has an improved signal-to-noise ratio at the output. The gain is directly proportional to the control voltage, accurately calibrated, and stable across different supply voltages and temperatures.

Specifications and Features

- Two Channels with Independent Gain Control

- "Linear in dB" Gain Response

- Two Gain Ranges:

       AD600: 0 dB to +40 dB

       AD602: -10 dB to +30 dB

- Accurate Absolute Gain: ±0.3 dB

- Low Input Noise: 1.4 nV/√Hz

- Low Distortion: -60 dBc THD at ±1 V Output

- High Bandwidth: DC to 35 MHz (-3 dB)

- Stable Group Delay: ±2 ns

- Low Power: 125 mW (max) per Amplifier

- Signal Gating Function for Each Amplifier

- Drives High Speed A/D Converters

- MIL-STD-883 Compliant and DESC Versions Available

Application Scenarios

- Ultrasound and Sonar Time-Gain Control

- High Performance Audio and RF AGC Systems

- Signal Measurement