AD1888JST

Overview

The AD1888JST is an AC '97 2.3 compatible SoundMAX codec manufactured by Analog Devices Inc., available in a 48-lead LQFP package. It features six DAC channels for 5.1 surround sound and supports double-rate audio at 96 kHz. The device includes integrated stereo headphone amplifiers, S/PDIF output, and multiple analog inputs such as phone, aux, line-in, and high-quality CD input. Key electrical specifications include a 90 dB dynamic range for both ADC and DAC paths, 20-bit PCM DAC resolution, and 16-bit ADC resolution. Power consumption is 563 mW under standard test conditions with AVDD at 5.0 V and DVDD at 3.3 V.

Feature Summary

• Supports AC '97 2.3 interface with integrated PLL for crystal-free system clocking
• Includes selectable front and rear microphone inputs with programmable preamplifier gain
• Features jack sense logic for automatic topology switching and software-controlled VREF_OUT for microphone bias
• Provides auto down-mix and channel spreading modes for flexible audio routing

Applications

• Desktop PC audio subsystems requiring 5.1 surround sound support
• All-in-one PCs and mini-towers utilizing AC '97 bus architecture
• Multimedia systems integrating S/PDIF digital audio output

Procurement Notes

Verify the specific suffix JST against the manufacturer's ordering guide to confirm the 48-lead LQFP package variant. Ensure compatibility with AC '97 host controllers and validate power supply requirements of 5.0 V analog and 3.3 V digital rails during integration.

Selection Notes

Select this component for designs requiring integrated headphone amplification and 5.1 channel output within an AC '97 framework. Consider the 48-lead LQFP package constraints for PCB layout and thermal management, noting the junction-to-ambient thermal resistance of 50.1°C/W.

Part Context

The AD1888 belongs to Analog Devices' SoundMAX codec family designed for PC audio applications. It replaces older single-channel or limited surround codecs by providing full 5.1 channel processing capabilities while maintaining backward compatibility with legacy AC '97 standards.

Replacement Considerations

No public confirmed substitute part numbers are documented.