AD8326ARE-REEL

Overview

The AD8326ARE-REEL is a high-output power, digitally controlled variable gain amplifier designed 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 maintains a differential 75 Ω output impedance and operates on dual ±5 V or single 10 V supplies. Key electrical parameters include a 100 MHz bandwidth, 25 dBm 1 dB compression point at maximum gain, and a quiescent current of 4 mA in sleep mode.

Feature Summary

• Digitally programmable gain control via SPI-compatible serial interface
• Maintains 75 Ω differential output impedance without external matching resistors
• Low power sleep mode reduces quiescent current to 4 mA
• Optimized for low distortion at high output power levels

Applications

• Upstream power amplifiers in DOCSIS certified cable modems
• CATV telephony systems and terminal devices
• General-purpose digitally controlled variable gain blocks
• Coaxial line drivers for data transmission

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 optimized for dual ±5 V supply operation. Ensure compatibility with existing thermal management designs, as the exposed pad requires direct soldering to a ground plane for adequate heat dissipation during high-power operation.

Selection Notes

Select the AD8326ARE variant when operating from dual ±5 V or single 10 V supplies rather than the +12 V required by the ARP model. This version is suitable for applications requiring up to 65 dBmV output power with lower power dissipation. Consider the 28-lead TSSOP package constraints and ensure the PCB layout supports the necessary thermal stitching and ground plane connections for reliable performance.

Part Context

The AD8326 series consists of two models: the ARP in a Power SOIC package for 12 V systems and the ARE in a TSSOP package for lower voltage applications. Both share identical functional specifications regarding gain control and signal processing but differ in supply voltage requirements and thermal characteristics. The ARE model is specifically engineered for cost-sensitive and space-constrained designs utilizing ±5 V rails.

Replacement Considerations

No public confirmed substitutes are available. As the AD8326 is marked obsolete, alternative solutions require redesigning the analog front-end to accommodate different gain ranges, supply voltages, and interface protocols.