AD1887JST

Overview

The AD1887JST is a 16-bit stereo full-duplex AC'97 codec manufactured by Analog Devices Inc. It operates with split power supplies of 3.3 V for digital logic and 5.0 V for analog circuits, housed in a 48-terminal TQFP package. The device supports variable sample rates from 7040 Hz to 48 kHz with 1 Hz resolution. It features integrated stereo headphone amplifiers, two analog line-level inputs (LINE-IN and CD), and a mono microphone input with a programmable preamp. Key performance metrics include a dynamic range exceeding 90 dB and a signal-to-noise ratio greater than 90 dB.

Feature Summary

• Supports variable sample rate audio within the AC'97 2.2 specification framework.
• Integrates multibit /H9018-/H9004 converter architecture for improved signal-to-noise ratios.
• Includes software-enabled VREFOUT output capability for powering microphones or external amplifiers.
• Features mobile low-power mixer mode and extended digital audio mixing capabilities.

Applications

• AC'97 compliant motherboard audio subsystems
• Desktop PC sound cards
• Integrated audio solutions for personal computers

Procurement Notes

Verify the component against the official Analog Devices datasheet specifications. Confirm that the 48-terminal TQFP package matches the required footprint. Ensure the operating temperature range aligns with the system design requirements before finalizing procurement.

Selection Notes

Select this component for systems requiring AC'97 2.2 compliance and full-duplex audio processing. Consider the split power supply requirement when designing the voltage regulation circuitry. Evaluate the thermal resistance characteristics if high ambient temperatures are expected in the application environment.

Part Context

This part belongs to the Analog Devices AC'97 SoundMAX codec family. It is designed to provide high-quality audio conversion for desktop computing platforms. The JST suffix indicates the specific thin-quad flatpack package option and commercial temperature range availability.

Replacement Considerations

Check for backward compatibility with AD1819 and AD1819A through aliased register addresses. Verify pinout and electrical specifications against other AC'97 codecs in the portfolio before substitution.

FAQ

What is the supported sample rate range?

The AD1887 supports variable sample rates ranging from 7040 Hz to 48 kHz with 1 Hz resolution.

How does the device handle power consumption?

It utilizes split power supplies (3.3 V digital/5 V analog) and offers multiple power-down states for the ADC, DAC, mixer, and AC-Link to reduce power dissipation.

What analog inputs are available?

The codec provides two analog line-level stereo inputs (LINE-IN and CD) and one mono microphone input with a built-in programmable preamp.