DATASHEET
10-CHANNEL HIGH DEFINITION AUDIO CODEC
STAC9271/9274
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Digital PC Beep to all outputs
Description
+5 V analog power supply options
Environmental 48-pin LQFP package
The STAC9271/74 areTheater Quality 10-channel audio
CODECs that enable systems with 7.1 audio playing
simultaneously with VoIP or another stereo audio stream.
IDT's proprietary ΣΔ technology provides high fidelity with
an estimated DAC SNR up to 105dB. Up to four digital
microphones are supported enabling high quality voice
input for increased usability of voice applications.
Software Support
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SKPI (Kernel Processing Interface)
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Enables plug-ins that can operate globally on all audio
streams of the system
Features
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12 band parametric equalizer SKPI plug-in
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High performance HD Audio CODEC provides
Theater Quality Audio
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Constant, system-level effects tuned to optimize a
particular platform can be combined with user-mode
“presets” tailored for specific acoustical environments
and applications
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High performance ΣΔ technology
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105dB DAC SNR
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System-level effects automatically disabled when
external connections made
90dB ADC SNR
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Five Stereo DACs and three stereo ADCs
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Dynamics Processing SKPI plug-in
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Supports 7.1 Audio with simultaneous Real Time
Communication (RTC) channel such as VoIP or separate
stereo audio stream
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Enables improved voice articulation
Compressor/limiter allows higher average noise level
without resonances
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24-bit resolution with up to 192 KHz sample rates
Digital Microphone Interface (STAC9274)
Dolby PC Entertainment Experience Logo Program
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Dolby Master StudioTM (STAC9274D)
Dolby Home TheaterTM (STAC9271D, STAC9274D)
Dolby Sound RoomTM(STAC9271D, STAC9274D)
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Direct interface up to four Digital Microphones
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Analog Stereo Microphone
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Microphone Boost 0, 10, 20, 30, 40dB
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Dolby Technologies
Six adjustable Vref outputs for microphone bias
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Dolby HeadphoneTM, Dolby Virtual SpeakerTM
Dolby ProLogic IITM, Dolby ProLogic IIxTM
Dolby Digital LiveTM
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Integrated Headphone Amps (3)
S/PDIF In and Out
TM
®
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Intel Audio Studio from Sonic Focus
ADAT Optical “Lightpipe” Output
Support (STAC9274)
TM
Maxx Player from Waves
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Volume Up/Down Control
Microphone Beam Forming, Acoustic Echo
Cancellation, & Noise Suppression from
Jack Insertion Detect and Impedance Sensing
supports Jack Retasking and Universal Jacks
TM
Knowles
IDT™ 10-CHANNEL HIGH DEFINITION AUDIO CODEC
1
STAC9271/9274
V 1.1 01/08
IDT CONFIDENTIAL