AD8326AREZ

Overview

The AD8326AREZ is a high-output power, digitally controlled variable gain amplifier optimized for coaxial line driving applications. It supports the MCNS-DOCSIS upstream standard with an 8-bit serial interface controlling gain over a 53.5 dB range in 0.75 dB steps. The device accepts differential or single-ended inputs and maintains a 75 Ω differential output impedance. Operating on dual ±5 V supplies, it delivers up to 65 dBmV output power with low distortion characteristics.

Feature Summary

• Digitally programmable gain control via SPI interface
• Maintains 75 Ω differential output impedance
• Supports DOCSIS reverse path transmission standards
• Integrated sleep mode for reduced quiescent current

Applications

• Gain-programmable line drivers
• CATV telephony modems
• CATV terminal devices
• General-purpose digitally controlled variable gain blocks

Procurement Notes

Verify component authenticity as this part is listed as obsolete by Analog Devices. Confirm that the ARE suffix corresponds to the TSSOP package variant designed for dual ±5 V supply operation. Ensure compatibility with existing thermal management strategies, as the exposed pad requires direct soldering to a ground plane for adequate heat dissipation during high-power operation.

Selection Notes

Select the AD8326AREZ when dual ±5 V power supplies are available and lower power dissipation is required compared to the ARP variant. This model is suitable for applications demanding up to 65 dBmV output power. Consider the TSSOP package constraints and ensure the design accommodates the specific thermal resistance requirements associated with the exposed pad configuration.

Part Context

The AD8326 series comprises high-output power line drivers intended for cable modem upstream paths. The AD8326AREZ specifically utilizes a 28-lead TSSOP package with an exposed thermal pad. It is engineered to drive 75 Ω loads such as coaxial cables while providing precise digital gain adjustment to compensate for varying distances between the modem and the headend.

Replacement Considerations

No public confirmed substitutes are identified in the provided documentation.