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PRODUCT OVERVIEW

The AD1881A meets the Audio Codec ’97 2.0 and 2.1 Extensions. In addition, the AD1881A SoundMAX Codec is designed to meet all requirements of the Audio Codec ’97, Component Specification, Revision 1.03, ? 1996, Intel Corporation, found at www.Intel.com. The AD1881A also includes some other Codec enhanced features such as the built-in PHAT Stereo 3D enhancement.

The AD1881A is an analog front end for high performance PC audio applications. The AC’97 architecture defines a 2-chip audio solution comprising a digital audio controller, plus a high quality analog component that includes Digital-to-Analog Converters (DACs), Analog-to-Digital Converters (ADCs), mixer and I/O.

The main architectural features of the AD1881A are the high quality analog mixer section, two channels of Σ? ADC conversion, two channels of Σ? DAC conversion with Data Direct Scram bling (D2S) rate generators. The AD1881A’s left channel ADC and DAC are compatible for modem applications supporting irrational sample rates and modem filtering requirements.

AC’97 2.1 FEATURES

Variable Sample Rate

True Line-Level Output

Supports Secondary Codec Modes

AC’97 FEATURES

Designed for AC’97 Analog I/O Component

48-Lead LQFP Package

Multibit ΣΔ Converter Architecture for Improved

S/N Ratio Greater than 90 dB

16-Bit Stereo Full-Duplex Codec

Four Analog Line-Level Stereo Inputs for Connection

from LINE, CD, VIDEO, and AUX

Two Analog Line-Level Mono Inputs for Speakerphone

and PC BEEP

Mono MIC Input Switchable from Two External

Sources

High Quality CD Input with Ground Sense

Stereo Line-Level Output

Mono Output for Speakerphone or Internal Speaker

Power Management Support

ENHANCED FEATURES

Mobile Low Power Mixer Mode

Digital Audio Mixer Mode

Full Duplex Variable 8 kHz to 48 kHz Sampling Rate

with 1 Hz Resolution

PHAT? Stereo 3D Stereo Enhancement

Split Power Supplies (3.3 V Digital/5 V Analog)

Extended 6-Bit Master Volume Control

Audio Amp Power-Down Signal