AD8018ARZ

Overview

The AD8018ARZ is a dual, high-speed current feedback amplifier designed for single-supply xDSL applications. It operates on a 3.3 V to 8 V supply with a typical quiescent current of 9 mA per amplifier. The device features rail-to-rail output capability, delivering 400 mA into a 10 Ω differential load while maintaining low distortion. Key electrical parameters include a 130 MHz bandwidth, 300 V/µs slew rate, and 4.5 nV/√Hz input voltage noise density at 100 kHz.

Feature Summary

• Rail-to-rail output stage capable of driving signals within 0.5 V of the power supply rails.
• High output current drive of 400 mA into differential loads for extended line reach.
• Low-power operation with standby and shutdown modes controlled by digital logic inputs.
• Fabricated using XFCB process technology for high bandwidth and minimal distortion.

Applications

• xDSL USB, PCI, or PCMCIA-based Customer Premise Equipment (CPE).
• Consumer DSL modems requiring low-cost, high-performance line drivers.
• Twisted pair line drivers for ADSL, SDSL, and VDSL systems.

Procurement Notes

Verify package availability as the AD8018ARZ in SOIC-8 may be discontinued; check for active equivalents like the AD8018ARU in TSSOP-14. Confirm RoHS compliance status through official Analog Devices documentation. Ensure ordering suffixes match required packaging formats such as tube or reel. Validate that the specific variant supports the intended temperature range and pin configuration for your design.

Selection Notes

Select the AD8018 for applications requiring high output current and low distortion in single-supply environments. The device is optimized for 5 V operation but supports a wider 3.3 V to 8 V range. Consider the TSSOP-14 package if digital control pins for standby and shutdown modes are required, as these are not available in the 8-lead SOIC version. Ensure adequate thermal management for high power dissipation scenarios.

Part Context

The AD8018 belongs to Analog Devices' family of high-speed current feedback amplifiers. It is specifically engineered for xDSL line driving, offering a balance of speed, current capability, and power efficiency. The component is part of the broader AD8018 series, which includes variants in different packages and packaging options to suit various manufacturing needs.

Replacement Considerations

Publicly confirmed substitutes include other models within the AD8018 family, such as the AD8018ARU in a 14-lead TSSOP package. When replacing the AD8018ARZ, verify pin compatibility and functional equivalence, particularly regarding the presence of power-down logic controls which may differ between package types.