AD8327ARU

Overview

The AD8327ARU is a digitally controlled variable gain amplifier optimized for coaxial line driving applications. It operates from a single 5 V supply and accepts differential or single-ended inputs. The device provides a programmable gain range of 48.16 dB with steps of 6.02 dB per major carry, controlled via an SPI interface. It maintains a constant 75 Ω output impedance in both transmit enable and disable modes. Key performance metrics include a bandwidth of 160 MHz, –63 dBc SFDR at 21 MHz, and –47 dBmV output noise in 160 kHz.

Feature Summary

• Digitally controlled variable gain amplifier with 48.16 dB range
• Maintains constant 75 Ω output impedance during transmit disable
• Supports DOCSIS upstream transmission standards
• Integrated sleep mode for reduced quiescent current

Applications

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

Procurement Notes

Verify the specific ordering suffix to confirm package type and temperature range. Confirm that the component meets all required electrical specifications for the target application. Check for any obsolete status notices as the datasheet indicates this revision may be outdated. Ensure compatibility with existing serial interface protocols.

Selection Notes

Select based on required gain resolution and output power levels. Consider the input impedance requirements (single-ended vs. differential) for proper termination. Evaluate the need for transmit disable isolation and sleep mode functionality. Ensure the operating temperature range matches the environmental conditions of the final assembly.

Part Context

This component belongs to the Analog Devices family of digitally controlled variable gain amplifiers designed for CATV and DOCSIS applications. It serves as an upstream power amplifier or line driver, replacing discrete solutions with an integrated, cost-effective alternative. The device simplifies design by combining attenuation, buffering, and amplification in a single package.

Replacement Considerations

Public confirmed substitutes are not available in the provided documentation. Verify if newer revisions or equivalent parts from the same manufacturer offer improved availability or updated features while maintaining pin compatibility and electrical performance.