AD8391AR

Overview

The AD8391AR is an obsolete dual xDSL line driver amplifier fabricated on Analog Devices' XFCB process. It operates on a single supply voltage ranging from 3 V to 12 V, or equivalent dual supplies. The device features a high output drive capability of 340 mA and a bandwidth of 40 MHz with a slew rate of 375 V/µs. It maintains low distortion with –82 dBc SFDR at 100 kHz into a differential load. The unit includes a power-down feature controlled by a logic pin, allowing full power, standby, or shutdown modes. It is housed in an 8-lead SOIC package.

Feature Summary

• Dual current feedback amplifiers optimized for low distortion xDSL line driving
• Integrated three-state power-down control for full power, standby, and shutdown operation
• High output current drive exceeding 340 mA while maintaining low harmonic distortion
• Internal VMID biasing simplifies single-supply circuit design

Applications

• VoDSL modems
• xDSL USB, PCI, and PCMCIA cards
• Line-powered xDSL systems
• Battery backup xDSL modems

Procurement Notes

The AD8391AR is officially classified as obsolete and no longer manufactured by Analog Devices. Verification of availability should focus on surplus distributors or secondary market sources rather than direct manufacturer channels. Designers must confirm the authenticity of components sourced from non-original suppliers due to the end-of-life status. Alternative solutions or newer generation line drivers should be evaluated for new designs to ensure long-term supply stability.

Selection Notes

This component is suitable for applications requiring high-speed signal processing with significant current drive capabilities within a compact form factor. The internal mid-point reference reduces external component count for single-supply configurations. Engineers should account for the thermal constraints of the 8-lead SOIC package when designing for high output power levels. The current feedback architecture offers bandwidth stability independent of closed-loop gain settings.

Part Context

The AD8391 belongs to the Analog Devices line driver family, specifically engineered for digital subscriber line (xDSL) customer premise equipment. It utilizes the company's eXtra Fast Complementary Bipolar (XFCB) process to achieve high frequency performance and low noise characteristics. This specific model represents a dedicated solution for driving telephone lines with minimal distortion.

Replacement Considerations

No direct public substitutes are confirmed in the provided documentation. As the part is obsolete, designers should consult Analog Devices for recommended modern replacements that offer compatible electrical specifications and pinout arrangements for existing PCB layouts.