DATASHEET
HIGH-PERFORMANCE 6-CHANNEL AC’97
2.3 CODEC WITH UNIVERSAL JACKS™
STAC9758/9759
OVERVIEW
DESCRIPTION
High performance, 6-channel, AC’97 2.3 CODECs with
high Signal-to-Noise ratio and low distortion.
IDT's STAC9758/9759 are general purpose 20-bit, full
duplex, 6-Channel audio CODECs conforming to the ana-
log component specification of AC '97 (Audio Codec 97
Component Specification Rev. 2.3). The STAC9758/9759
incorporates IDT's proprietary SD technology to achieve a
DAC SNR in excess of 90dB. With IDT’s headphone drive
capability, headphones can be driven without an external
amplifier. The STAC9758/9759 communicates via the five
AC-Link to any digital component of AC '97, providing flexi-
bility in the audio system design. Packaged in an AC '97
compliant 48-pin TQFP, the STAC9758/9759 can be
placed on the motherboard, daughter boards, PCI, AMR,
CNR, MDC or ACR cards.
FEATURES
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High performance SD technology
6-Channel AC’97 2.3 CODECs
20-bit full duplex stereo ADCs
20-bit full duplex DACs
Headphone drive capability
SPDIF_IN Support
SPDIF_OUT Support, including 96 kHz
ADAT® Optical “Litepipe” Interface
Support
Supported ADC and DAC audio sample rates include
96kHz, 48kHz, 44.1kHz, 32kHz, 22.05kHz, 16kHz,
11.025kHz, and 8 kHz; additional rates are supported in
the STAC9758/9759 soft audio drivers. All ADCs and
DACs operate at 20-bit resolution. SPDIF_OUT supported
sample rates include 96kHz, 48kHz, 44.1kHz and
32kHz. SPDIF_IN supports 48kHz and 44.1kHz.
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Universal JacksTM Functionality for jack
interchangeability
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Internal Jack Sensing
Crystal Elimination Circuit
Front/Rear Stereo Microphone
96 kHz DAC Playback support
Up to 5 General Purpose I/Os
Digital and Analog PC BEEP
The STAC9758/9759 includes internal jack sensing using
proprietary IDT current and impedance-sensing tech-
niques. The impedance load on any of the inputs or outputs
can be detected. The STAC9758/9759 also supports Uni-
versal JacksTM functionality for jack interchangeability.
The GPIOs on the STAC9758/9759 remain available for
advanced configurations. The STAC9758/9759 can sup-
port up to 5 GPIOs.
AC’97 2.3 Paging Registers and Analog Plug and
Play Capability
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Energy saving dynamic power modes
>90 dB SNR and >-90dBV THD+N
The STAC9758/9759 is designed primarily to support
6-channel audio. Additionally, the STAC9758/9759 pro-
vides for a stereo enhancement feature, IDT Surround 3D
(SS3D).
Adjustable VREF_OUT Control
Pin compatible with 2-Channel CODECs
Independent sample rates for ADC & DACs
+3.3 V & +5 V analog power supply options
The STAC9758/9759 also supports the ADAT® Optical
“Litepipe” Interface, which provides an 8 channel output for
professional and consumer audio applications.
The STAC9758/9759can be SoundBlaster® and Windows
Sound System® compatible when used with IDT’s WDM
driver for Windows 98/2K/ME/XP or with Intel/Microsoft
driver included with Windows 2K/ME/XP.
SoundBlaster is a registered trademark of Creative Labs.
Windows is a registered trademark of Microsoft Corporation.
ADAT Optical is a registered trademark of Alesis Corporation.
IDT™
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STAC9758/9759
V 1.2 1206
HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS™