Audio Codec '97

AC ‘97 Component Specification Revision 2.3 Rev 1.0
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1. Introduction and Overview
This specification defines the Audio Codec ‘97 (AC ‘97) Architecture and Digital Interface (AC-link) specifically
designed for implementing audio and modem I/O functionality in mainstream PC systems. This specification does
not explicitly define the companion AC ‘97 Digital Controller component (sometimes referred to or abbreviated as
DC ‘97), which typically varies in features and implementation, but is AC ‘97 compliant with this specification.
Typical AC ‘97 devices include:
• Audio Codec (often referred to or abbreviated as AC ‘97 or just AC)
• Modem Codec (often referred to or abbreviated as MC ‘97 or just MC)
• Combined Audio/Modem Codec (often referred to or abbreviated as AMC ‘97 or just AMC)
1.1 Audio Codec Feature List
16-bit full-duplex stereo audio Codec (DAC and ADC)
AC ‘97 1.x compliant indicates fixed 48K sampling rate operation (non-extended feature set)
AC ‘97 2.1 compliant indicates extended audio feature set (optional variable rate, multichannel, etc.)
AC ‘97 2.2 compliant indicates extended audio, enhanced riser audio support, and optional S/PDIF
AC’ 97 2.3 compliant indicates extended configuration information and optional jack sensing support
Industry Standard 48-pin QFP package and pinout
Up to four analog line-level stereo inputs; up to two analog line-level mono inputs
High quality pseudo-differential analog CD input
MIC input with 20 dB boost, programmable gain, and AEC reference capability
Dedicated stereo output (LINE_OUT)
Additional stereo output (AUX_OUT) configurable as line level, optional headphone, or optional 4 or 6-ch
output
Mono output for speakerphone or internal mono speaker output.
Optional 18- or 20-bit DAC and ADC resolution
Optional output tone and loudness controls
Optional 3D stereo output enhancement
Optional 3rd ADC input channel for dedicated voice input
Optional integrated Sony/Philips Digital Interface (S/PDIF) transmitter for digital output
Comprehensive Power Management capability
Optional Codec Interrupt generation
Extended Codec revision and configuration information
Optional Jack sensing and reporting of connected devices
1.2 Modem Codec Feature List
16-bit full-duplex modem line Codec (DAC and ADC)
AC ‘97 1.x compliant modem indicates proprietary modem functionality (vendor specific feature set)