AD8322ARU

Overview

The AD8322ARU is a single-channel, digitally controlled variable gain amplifier optimized for coaxial line driving applications. It operates on a 5 V supply and supports SPI interfaces. The device provides a gain range of 42.14 dB with coarse steps of 6.02 dB per major carry. Key electrical parameters include an output noise level of -46 dBmV in a 160 kHz bandwidth, a signal-to-noise ratio performance yielding -58 dBc SFDR at 21 MHz, and a bandwidth of 180 MHz.

Feature Summary

• Digitally controlled variable gain amplifier with 42 dB programmable range
• Maintains 75 Ω output impedance for coaxial line driving
• Low distortion performance suitable for DOCSIS reverse path transmission
• Supports power-up and power-down conditions via serial interface

Applications

• DOCSIS-compliant data modems
• Gain programmable line drivers
• Interactive set-top boxes
• PC plug-in modems
• General-purpose digitally controlled variable gain blocks

Procurement Notes

Verify the specific suffix against official Analog Devices documentation to confirm package type and tape-and-reel specifications. Confirm RoHS compliance status through current manufacturer declarations. Check for obsolescence notices or lifecycle changes prior to procurement planning. Ensure compatibility with existing SPI control logic levels.

Selection Notes

Select this component for applications requiring precise digital gain control in cable modem upstream paths. Evaluate the 6 dB step resolution against system requirements. Consider the 180 MHz bandwidth for frequency response needs. Verify that the 5 V supply voltage aligns with the target system architecture.

Part Context

The AD8322 belongs to the AD832x family of CATV line drivers designed for digital control. It serves as a cost-effective solution for coaxial network infrastructure. The device integrates gain control circuitry optimized for DOCSIS standards. It replaces older analog gain adjustment methods with digital precision.

Replacement Considerations

The AD8323 offers fine-step output power control as an alternative. The AD8326 provides high output power capabilities for different drive requirements. The AD8327 is another coarse-step option within the same family. Verify pinout and register compatibility before substitution.