AD1885JST

Overview

The AD1885JST is an AC'97 SoundMAX codec manufactured by Analog Devices Inc. It operates within a temperature range of 0°C to 70°C and utilizes a 48-lead LQFP package. The device supports split power supplies, requiring 3.3 V for digital logic (DVDD) and 5.0 V for analog circuits (AVDD). It features variable sample rates from 7040 Hz to 48 kHz with 1 Hz resolution. Key specifications include greater than 90 dB dynamic range for both ADC and DAC channels, 16-bit stereo full-duplex conversion, and integrated headphone amplifiers.

Feature Summary

• Supports AC'97 2.1 compliance with multiple codec configuration options
• Includes built-in PHAT Stereo 3D enhancement technology
• Features jack sense pins for automatic output switching
• Provides software-enabled VREFOUT output for microphone bias

Applications

• High-performance PC audio systems
• Modem applications supporting host-based and data pump modems
• DSP applications requiring analog front-end processing

Procurement Notes

Verify the component against official datasheets to confirm pinout compatibility and electrical characteristics. Ensure that the operating voltage requirements match the system design. Check for ESD sensitivity precautions during handling. Confirm the package type matches the PCB footprint. Validate the temperature range suitability for the intended environment.

Selection Notes

Select this component when AC'97 2.1 compliance is required for legacy or specific industrial audio interfaces. Consider the integrated headphone amplifier and stereo line outputs for direct connection capabilities. Evaluate the power management modes if low-power operation in notebook environments is necessary. Verify that the 48-lead LQFP package fits the available board space.

Part Context

The AD1885 is part of Analog Devices' SoundMAX codec family designed for PC audio solutions. It integrates analog-to-digital and digital-to-analog converters with a high-quality analog mixer. The device supports telephony modem functions and variable sample rate processing, making it suitable for versatile audio and communication applications.

Replacement Considerations

Check for backward compatibility with AD1819B where indicated in register maps. Verify pin-to-pin compatibility before substitution. Ensure the replacement supports the same AC'97 version and power supply requirements.