STAC9758 Datasheet, PDF (7/119 Pages) Integrated Device Technology – HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS

STAC9758/9759
HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS™
PC AUDIO
1. DESCRIPTION
IDT's STAC9758/9759 are general purpose 20-bit, full duplex, 6-Channel audio CODECs conform-
ing to the analog component specification of AC '97 (Audio Codec 97 Component Specification Rev.
2.3). The STAC9758/9759 incorporates IDT's proprietary Σ∆ technology to achieve a DAC SNR in
excess of 90dB. With IDT’s headphone drive capability, headphones can be driven without an exter-
nal amplifier. The STAC9758/9759 communicates via the five AC-Link to any digital component of
AC '97, providing flexibility 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.
Supported ADC and DAC audio sample rates include 96kHz, 48kHz, 44.1kHz, 32kHz, 22.05kHz,
16kHz, 11.025kHz, and 8kHz; 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 48 kHz and 44.1kHz.
The STAC9758/9759 includes internal jack sensing using proprietary IDT current and imped-
ance-sensing techniques. The impedance load on any of the inputs or outputs can be detected. The
STAC9758/9759 also supports Universal Jacks^TM functionality for jack interchangeability.
The GPIOs on the STAC9758/9759 remain available for advanced configurations. The STAC9758/
9759 can support up to 5 GPIOs.
The STAC9758/9759 implementation of internal jack sense uses the Extended Paging Registers
defined by the AC '97 2.3 Specification. This allows for additional registry space to hold the identifi-
cation information about the CODEC, the jack sensing details and results, and the external sur-
roundings of the CODEC. The information within the Extended Paging Registers will allow for the
automatic configuration of the audio subsystem without end-user intervention. For example, the
BIOS can populate the Extended Paging Registers with valuable information for both the audio
driver and the operating system such as gain and attenuation stages, input population and input
phase and jack location. With this input information, the IDT driver will automatically provide to the
Volume Control Panel only the volume sliders that are implemented in the system, thus improving
the end-user's experience with the PC.
The information in the Extended Paging Registers will also allow for automatic configuration of
microphone inputs, the ability to switch between SPDIF and analog outputs, the routing of the mas-
ter volume slider to the proper physical output, and SoftEQ configurations. The fully parametric IDT
SoftEQ can be initiated upon jack insertion and removal.
The STAC9758/9759 is designed primarily to support 6-channel audio. Additionally, the STAC9758/
9759 provides for a stereo enhancement feature, IDT Surround 3D (SS3D).
The STAC9758/9759 also supports the ADAT^® Optical “Litepipe” Interface, which pro-
vides an 8 channel output for professional and consumer audio applications.
The STAC9758/9759 can 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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HIGH-PERFORMANCE 6-CHANNEL AC’97 2.3 CODEC WITH UNIVERSAL JACKS™
STAC9758/9759
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