stac9272 Integrated Device Technology, stac9272 Datasheet - Page 22

• Manufacturer Part Number: stac9272
• Description: 10-channel High Definition Audio Codec
• Manufacturer: Integrated Device Technology

IDT™
STAC9271/9272/9273/9274
10-CHANNEL HIGH DEFINITION AUDIO CODEC
3.2.
10-CHANNEL HIGH DEFINITION AUDIO CODEC
SPDIF Input
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 IDT Extranet
for more information.
SPDIF IN can operate at 44.1 KHz, 48 KHz or 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.
Bins
000b
001b
010b
011b
100b
101b
110b
111b
Return Hex Code
012Ch
07D0h
0BB8h
028Ah
03E8h
0064h
2710h
2710h
IDT CONFIDENTIAL
Impedance = 1275 +/- 25%
Impedance = 2000 +/- 25%
Impedance Level (Ohms)
1275 > Impedance < 2000
Impedance = 300 +/- 25%
300 > Impedance < 1275
Table 2: Impedance Sense
Impedance < 300
22
> 2000
> 2000
Passive Speakers, Headset Speakers
STAC9271/9272/9273/9274 V 1.0 MARCH2007
Amplified Speakers, Line In
Amplified Speakers, Line In
General Device Detected
Some Headset Speakers
Some Microphones
Amplified Speakers
Microphones
Microphones
PC AUDIO