STAC9721 Datasheet, PDF (1/48 Pages) List of Unclassifed Manufacturers – Stereo AC 97 Codec With Multi-Codec Option

SigmaTel, Inc.
Integrating Mixed-Signal Solutions
DATA SHEET
STAC9721/23
Stereo AC'97 Codec
With Multi-Codec Option
GENERAL DESCRIPTION:
SigmaTel’s STAC9721/23 is a general-purpose 18-bit stereo, full duplex, audio codec that conforms to
the analog component specification of AC'97 (Audio Codec 97 Component Specification Rev. 2.1). The
STAC9721/23 incorporates SigmaTel’s proprietary Sigma-Delta technology to achieve a DAC SNR in
excess of 95dB. The DACs, ADCs, and mixer are integrated with analog I/Os, which include four analog
line-level stereo inputs, two analog line-level mono inputs, two stereo outputs, and one mono output
channel. Also included are SigmaTel’s 3D stereo enhancement (SS3D), and an extra true line-level out
for headphones or speaker amplifiers. The STAC9721/23 may be used as a secondary codec, with the
STAC9700/04/07/44/45 or a 4-channel STAC9708 as the primary, in multiple codec configurations
conforming to the AC'97 Rev. 2.1 specification. This configuration can provide up to six-channel output,
providing AC-3 playback for DVD applications. The STAC9721/23 communicates via the five-wire AC-
Link interface with any AC-Link capable controller or advanced core logic chip-set. Packaged in an
AC'97 compliant 48-pin TQFP, the STAC9721/23 can be placed on motherboards, daughter boards, add-
on cards or AMR/MDC cards.
FEATURES:
• High performance Σ∆ technology
• Energy saving power down modes
• 18-bit full duplex stereo ADC, DACs
• AC-Link protocol compliance
• 3.3V Multiple power supply options
• Pin compatible with the STAC9700/44/45
• SigmaTel Surround (SS3D) Stereo Enhancement
• EAPD – External Amplifier Power Down Control
• Multi-Codec option (Intel AC'97 rev 2.1)
• Six analog line-level inputs
• 48-pin TQFP
• LINE-to-LINE SNR 102dB
• The STAC9723 is tested at +3.3V
ORDERING INFORMATION:
PART
NUMBER
STAC9721T
STAC9723T
PACKAGE
48-pin TQFP 7mm x7mm x 1.4mm
48-pin TQFP 7mmx7mm x 1.4mm
TEMPERATURE
RANGE
0o C to +70o C
0o C to +70o C
SUPPLY RANGE
DVdd = 3.3V or 5V, AVdd = 5V
DVdd = 3.3V, AVdd = 3.3V
SigmaTel reserves the right to change specifications without notice
1
04/07/00