AD8331ARQ-REEL

Overview

The AD8331ARQ-REEL is a single-channel ultralow noise variable gain amplifier (VGA) from Analog Devices, part of the X-AMP family. It integrates an LNA with 19 dB gain and a VGA offering a 48 dB range. The device operates on a single 5 V supply, consuming 25 mA per channel. Key electrical parameters include a 120 MHz bandwidth, 0.74 nV/√Hz voltage noise, and a gain scaling factor of 50 dB/V. It supports programmable input impedance matching via a single resistor and features selectable output clamping levels.

Feature Summary

• Integrates an ultralow noise preamplifier with active input impedance matching capability
• Provides linear-in-dB gain control with a wide dynamic range and precise scaling
• Includes a postamplifier with selectable gain and adjustable output limiting

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 ordering suffix to confirm package type and reel specifications. Confirm that the component matches the required temperature grade and pin configuration for your PCB layout. Ensure compatibility with the intended supply voltage and gain control interface requirements before finalizing procurement.

Selection Notes

Select this component for applications requiring low noise amplification at frequencies up to 120 MHz. It is suitable for driving high-speed ADCs due to its low output-referred noise. Consider the available gain modes and output clamping options when designing for specific converter input ranges.

Part Context

This device belongs to the AD8331/AD8332/AD8334 family of variable gain amplifiers. While the AD8332 offers dual channels and the AD8334 provides four channels, the AD8331 is optimized as a single-channel solution. All variants share similar core architectures and performance characteristics within their respective channel counts.

Replacement Considerations

Direct replacements within the same family include the AD8332 for dual-channel needs or the AD8334 for quad-channel configurations. Verify pinout compatibility and thermal requirements when substituting between different package types such as QSOP, TSSOP, or LFCSP.