AD1881AJSTZ

Overview

The AD1881AJSTZ is an AC'97 SoundMAX codec in a 48-lead LQFP package, operating from 0°C to 70°C. It features split power supplies (3.3 V digital, 5.0 V analog) and supports full-duplex stereo audio with variable sample rates from 8 kHz to 48 kHz at 1 Hz resolution. The device includes two 16-bit sigma-delta ADCs and DACs, achieving a signal-to-noise ratio greater than 90 dB for CD inputs. It provides four stereo line-level inputs (LINE_IN, AUX, CD, VIDEO), two mono inputs (PHONE_IN, PC_BEEP), and a switchable MIC input. Power dissipation is typically 280 mW, with standby current as low as 0.1 mA.

Feature Summary

• Supports AC'97 2.0 and 2.1 specifications with built-in PHAT Stereo 3D enhancement
• Enables independent left and right channel processing at different sample rates
• Provides true line-level outputs suitable for notebook docking stations and home theater systems
• Includes comprehensive analog mixing capabilities with programmable gain and attenuation

Applications

• High-performance PC audio applications
• Notebook docking station audio interfaces
• Home theater system audio front ends

Procurement Notes

Verify the ordering suffix JSTZ corresponds to the 48-lead LQFP package and commercial temperature range. Confirm that the component meets AC'97 2.1 compliance requirements for your specific host controller interface. Ensure proper ESD handling procedures are followed during assembly due to the sensitivity of the CMOS logic inputs.

Selection Notes

Select this model when designing systems requiring AC'97 compatibility with high-quality analog performance. It is suitable for applications needing separate stereo and mono output paths. Consider the split power supply requirement if your design does not already provide isolated 3.3 V and 5.0 V rails. Verify that the host controller supports the required serial data and bit clock frequencies.

Part Context

The AD1881A is part of Analog Devices' SoundMAX codec family, designed specifically for the AC'97 architecture. It serves as the analog front-end companion to digital audio controllers, integrating converters, mixers, and I/O stages into a single chip to reduce board space and simplify audio subsystem design in personal computers.

Replacement Considerations

The AD1819 and AD1819A are backward compatible models. Check register aliasing differences, particularly for sample rate registers, when substituting these parts. Ensure pinout compatibility remains consistent across the LQFP package variants.