STAC9228 Integrated Device Technology, STAC9228 Datasheet - Page 23

• Manufacturer Part Number: STAC9228
• Description: Theater Quality Eight Channel High Definition Audio Codec With Digital Microphone Interface
• Manufacturer: Integrated Device Technology

IDT™
STAC9227/9228/9229/9230
8-CHANNEL HIGH DEFINITION AUDIO CODEC
3.2.
3.3.
3.4.
8-CHANNEL HIGH DEFINITION AUDIO CODEC
Impedance Sense
SPDIF Input
SPDIF Output
Impedance Sense is accomplished by on-chip circuitry that measures the impedance at the pin of
the chip and compares it to internal reference impedance. Below is a table that contains the bin infor-
mation and codes returned when the pin widget impedance field in the Port Pin Sense widget is
read. Please note that even under the best conditions, there is no method to guarantee 100%
impedance sensing due to variations in external circuitry and impedance overlap of devices that can
be plugged into a jack. The impedance sense table reflects both standard Line Out and Headphone
output drivers. Please reference the HD Audio Universal Jack Application Note on the SigmaTel
Extranet for more information.
SPDIF IN can operate at 44.1 KHz, 48 KHz and 96 KHz, and implements internal Jack Detect.
A sophisticated digital PLL allows automatic rate detection and accurate data recovery. The ability to
accept consumer SPDIF voltage levels directly eliminates the need for costly external receiver ICs.
Advanced features such as record slot select and SPDIF_IN routing to the DAC allows for simulta-
neous record and play.
SPDIF Ouput can operate at 44.1 KHz, 48 KHz, 88.2 KHz, and 96 KHz, as defined in the Intel High
Definition Audio Specification, with resolutions up to 24 bits. This insures compatibility with all con-
sumer audio gear and allows for convenient integration into home theater systems and media center
PCs.
000b
001b
010b
100b
101b
Bins
011b
110b
111b
Return Hex Code
012Ch
07D0h
0BB8h
028Ah
03E8h
0064h
2710h
2710h
1275 Ω > Impedance < 2000 Ω
300 Ω > Impedance < 1275 Ω
Impedance = 1275 Ω +/- 25%
Impedance = 2000 Ω +/- 25%
Impedance = 300 Ω +/- 25%
Impedance Level (Ohms)
IDT CONFIDENTIAL
Impedance < 300 Ω
Table 1: Impedance Sense
23
> 2000 Ω
> 2000 Ω
Passive Speakers, Headset Speakers
STAC9227/9228/9229/9230V 1.0 MARCH 2007
General Device Detected
Amplified Speakers, Line In
Amplified Speakers, Line In
Some Headset Speakers
Some Microphones
Amplified Speakers
Microphones
Microphones
PC AUDIO