AD1881AJST

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