AD1886JST

Overview

The AD1886JST is an AC'97 2.2 compliant stereo codec manufactured by Analog Devices Inc., housed in a 48-lead LQFP package with an operating temperature range of 0°C to 70°C. It features split power supplies (3.3 V digital, 5.0 V analog) and supports full-duplex variable sample rates from 7040 Hz to 48 kHz with 1 Hz resolution. The device includes four analog line-level stereo inputs (LINE-IN, CD, VIDEO, AUX), two mono inputs (PHONE_IN, PC_BEEP), and a microphone input with a switchable 20 dB preamplifier. Digital specifications include 16-bit ADC and DAC resolutions, greater than 90 dB dynamic range, and a 20-bit SPDIF output supporting 32 kHz, 44.1 kHz, and 48 kHz symbol rates.

Feature Summary

• AC'97 2.2 compliant interface with support for variable sample rates and multiple codec configuration options.
• Integrated stereo headphone amplifier and software-enabled VREFOUT output for external power amplifiers.
• Jack sense pins provide automatic output switching between line outputs and headphones.
• Supports mobile low-power mixer mode and extended volume control for master and headphone channels.

Applications

• Desktop and laptop computer audio subsystems
• Telephony speakerphone integration
• Multimedia peripheral devices

Procurement Notes

Verify the specific suffix 'JST' against the manufacturer's ordering guide to confirm the 48-lead LQFP package and commercial temperature range. Ensure compatibility with the host system's AC'97 controller requirements. Confirm that the required crystal frequency of 24.576 MHz is available for the XTL_IN pin. Review absolute maximum ratings to ensure supply voltages remain within specified limits during operation.

Selection Notes

Select this component when an AC'97 2.2 interface is required for legacy or specific embedded audio architectures. The split power supply design isolates digital noise from analog circuits, suitable for high-fidelity applications. Consider the integrated headphone amplifier if direct drive capability is needed without external components. Verify that the 48-terminal LQFP package fits the target PCB layout constraints.

Part Context

The AD1886JST is part of the AD1886A series of AC'97 codecs from Analog Devices. It serves as a central audio processing unit for personal computers, handling both playback and recording functions. The device integrates digital mixers, filters, and converters to manage multiple audio streams simultaneously.

Replacement Considerations

Check for backward compatibility with AD1819 and AD1819A registers, as indicated by aliased register addresses in the datasheet. Verify pinout compatibility if substituting with other ADI AC'97 codecs.

FAQ

What is the function of the JS pin?

The JS pin acts as a jack sense input to detect audio plug presence, automatically muting LINE_OUT or MONO outputs, or can be programmed as a general-purpose digital output.

How does the device handle PC Beep signals?

The PC_BEEP input provides passthrough functionality that remains active even during RESET states, allowing POST codes to be heard via the Line outputs.

What clock frequency is required for operation?

The device requires a 24.576 MHz input clock connected to the XTL_IN pin.