AD8322ARU-REEL

Overview

The AD8322ARU-REEL is a digitally controlled variable gain amplifier designed for coaxial line driving applications. It operates on a single 5 V supply and supports SPI interfaces. The device provides an 8-bit serial word to determine output gain over a range of 42.14 dB, with steps of 6.02 dB per major carry. Key electrical characteristics include a bandwidth of 180 MHz, an output noise level of -46 dBmV in a 160 kHz bandwidth, and a maintained 75 Ω output impedance.

Feature Summary

• Digitally programmable gain control via 8-bit serial interface
• Optimized for 75 Ω coaxial line driving applications
• Low distortion performance at specified output levels
• Supports power-up and power-down conditions

Applications

• DOCSIS-compliant data modems
• Gain programmable line drivers
• Interactive set-top boxes
• PC plug-in modems

Procurement Notes

Verify the specific suffix REEL against official Analog Devices documentation to confirm packaging type and reel specifications. Ensure compatibility with existing PCB footprints for the TSSOP package. Cross-reference the part number with current manufacturer lifecycle status to confirm availability and long-term support requirements for production designs.

Selection Notes

Select this component for applications requiring precise, digitally adjustable gain in RF signal paths. It is suitable for systems needing low distortion and stable 75 Ω impedance matching. Consider the 180 MHz bandwidth when evaluating high-frequency signal integrity. Verify that the system architecture can accommodate the required SPI communication protocol for gain adjustment.

Part Context

This component belongs to the AD8322 series from Analog Devices, specifically engineered for cable modem and CATV upstream transmission standards. It serves as a core building block for variable gain amplification in digital communication systems. The device integrates gain control logic directly with the amplifier stage to minimize external component count.

Replacement Considerations

Publicly confirmed substitutes within the same family include the AD8323, AD8325, AD8326, and AD8327. These alternatives offer variations such as fine step output power control or higher output power capabilities. Evaluate pinout compatibility and specific gain step resolutions when considering these replacements.