AD8323ARUZ-REEL

Overview

The AD8323ARUZ-REEL is a digitally controlled variable gain amplifier optimized for coaxial line driving applications. It operates from a single 5 V supply and features an 8-bit serial interface for gain control over a 53.5 dB range with 0.7526 dB/LSB steps. The device maintains a constant 75 Ω differential output impedance during power-up, power-down, and active states. Key electrical parameters include a bandwidth of 100 MHz, a maximum gain of 27.5 dB, and a quiescent current of 133 mA in power-up mode.

Feature Summary

• Maintains constant 75 Ω differential output impedance across all operational states including power-down
• Digitally programmable gain via SPI-compatible serial interface with fine step resolution
• Integrated sleep mode significantly reduces quiescent supply current
• Optimized for low distortion at high output levels suitable for DOCSIS upstream transmission

Applications

• DOCSIS certified cable modems for reverse path transmission
• HFC high-speed data modem upstream drivers
• Interactive set-top boxes requiring gain-programmable line driving
• General-purpose digitally controlled variable gain blocks

Procurement Notes

Verify the specific ordering suffix REEL to confirm tape-and-reel packaging configuration. Ensure compatibility with the required 28-lead TSSOP footprint and thermal management requirements. Confirm that the component meets RoHS standards as specified in the manufacturer's documentation. Cross-reference the full part number with official Analog Devices catalogs to validate availability and revision status.

Selection Notes

Select this component when a fixed 75 Ω output impedance is required without external termination resistors. It is suitable for designs needing precise digital gain adjustment over a wide dynamic range. Consider the 5 V single-supply operation and SPI interface compatibility. Evaluate the power consumption differences between power-up and sleep modes against system battery or thermal constraints.

Part Context

This device belongs to the AD8323 family of variable gain amplifiers designed specifically for cable television and data communication infrastructure. It integrates a low-noise input buffer, a vernier attenuation stage, and a high-power output amplifier into a single monolithic IC. The architecture supports both single-ended and differential input configurations while ensuring signal integrity in noisy RF environments.

Replacement Considerations

Publicly confirmed substitutes include the MA/COM ETC-1-IT-15 transformer for output coupling applications where the primary TOKO transformer is unavailable. No direct functional pin-to-pin replacements are explicitly documented in the provided source material for the amplifier core itself.