Table of Contents
Advertisement
1.9 Audio Subsystem
The board includes an Audio Codec '97 (AC '97) compatible audio subsystem consisting of these
devices:
Intel 82801BA ICH2 digital controller (AC link output)
Analog Devices AD1885 analog codec
Features of the audio subsystem include:
Split digital/analog architecture for improved S/N (signal-to-noise) ratio:
3-D stereo enhancement
Power management support for APM 1.2 and ACPI 2.0 (driver dependent)
The audio subsystem supports the following audio connectors:
Inputs:
Three analog line-level stereo inputs for connection from line in, CD, and auxiliary line in
One mono microphone input
Output: Stereo line-level output
For information about
Obtaining audio software and utilities
Obtaining the AC '97 specification
1.9.1 AD1885 Analog Codec
The AD1885 is a fully AC '97 compliant codec. The codec's features include:
> 90 dB signal-to-noise ratio sound quality
Power management support for APM 1.2 and ACPI 2.0 (driver dependent)
Playback sample rates up to 48 kHz
16 bit stereo full-duplex operation
Software compatible with Windows
(Windows Me), and Windows NT
Full-duplex operation at asynchronous hardware record/playback sample rates
Frequency response: 20 Hz to 20 kHz ( 0.1 dB)
Figure 4 is a block diagram of the board's audio subsystem, including the Intel 82801BA ICH2
digital controller, the AD1885 analog codec, and the audio connectors.
I/O Controller Hub
†
98 SE, Windows 2000, Windows Millennium Edition
†
4.0
82801BA
AC '97 Link
(ICH2)
Figure 4. Block Diagram of Audio Subsystem
Desktop Board Description
Refer to
Section 1.2, page 16
Table 3, page 16
CD-ROM
Analog Devices
Auxiliary Line In
AD1885
Mic In
Line In
Analog Codec
Line Out
OM11133
85 dB
29
Advertisement
Table of Contents
