AD8332ARU

Overview

The AD8332ARU is a dual-channel ultralow noise variable gain amplifier (VGA) from Analog Devices. It features an integrated low-noise preamplifier with 19 dB gain and a 48 dB X-AMP VGA section. The device operates on a single 5 V supply, drawing 27.5 mA per channel. Key electrical parameters include a 100 MHz -3 dB bandwidth, 650 V/µs slew rate, and 40 nV/√Hz output-referred noise in LO gain mode. It supports programmable input impedance matching via an external resistor and offers selectable post-amplifier gain of 3.5 dB or 15.5 dB.

Feature Summary

• Integrates an ultralow noise preamplifier with active input impedance matching capability.
• Provides precise linear-in-dB gain control with excellent channel-to-channel matching.
• Includes a selectable gain post-amplifier with adjustable output limiting for ADC driving.

Applications

• Ultrasound and sonar time-gain controls
• High performance automatic gain control systems
• I/Q signal processing
• High speed, dual ADC drivers

Procurement Notes

Verify the specific package variant against the datasheet ordering guide, as the AD8332 is available in both TSSOP and LFCSP packages. Confirm that the required pinout matches the selected package type to ensure correct PCB footprint compatibility. Check for any specific revision history updates regarding pin descriptions or electrical characteristics before finalizing procurement.

Selection Notes

Select this component when dual-channel operation with ultralow noise is required. Compare the 100 MHz bandwidth against the AD8331's 120 MHz if higher frequency response is needed. Consider the power dissipation per channel and thermal management requirements for the chosen package. Ensure the gain control voltage range aligns with the system's control interface capabilities.

Part Context

The AD8332 belongs to the AD8331/AD8332/AD8334 family of X-AMP VGAs. While the AD8331 is a single-channel device and the AD8334 is quad-channel, the AD8332 provides a dual-channel solution. All variants share similar internal architectures but differ in channel count and package options, allowing designers to scale channel density without changing the core signal chain design.

Replacement Considerations

The AD8331 serves as a single-channel alternative within the same family. The AD8334 offers quad-channel integration. Verify pin compatibility and package dimensions when substituting, as the AD8332 is available in TSSOP and LFCSP formats which may not be directly pin-compatible with other packages.