1
04/07/00
DATA SHEET
SigmaTel, Inc.
Integrating Mixed-Signal Solutions
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
ΣΣΣΣ∆∆∆∆ 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
PACKAGE
TEMPERATURE
RANGE
SUPPLY RANGE
STAC9721T
48-pin TQFP 7mm x7mm x 1.4mm
0o C to +70o C
DVdd = 3.3V or 5V, AVdd = 5V
STAC9723T
48-pin TQFP 7mmx7mm x 1.4mm
0o C to +70o C
DVdd = 3.3V, AVdd = 3.3V
SigmaTel reserves the right to change specifications without notice
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