STAC9271 datasheet(22/223 Pages) IDT

22 / 223 page

STAC9271/9272/9273/9274

10-CHANNEL HIGH DEFINITION AUDIO CODEC

PC AUDIO

IDT™

10-CHANNEL HIGH DEFINITION AUDIO CODEC

STAC9271/9272/9273/9274 V 1.0 MARCH2007

IDT CONFIDENTIAL

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.

3.2.

SPDIF Input

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.

Table 2: Impedance Sense

Bins

Return Hex Code

Impedance Level (Ohms)

General Device Detected

000b

0064h

Impedance < 300

Passive Speakers, Headset Speakers

001b

012Ch

Impedance = 300 +/- 25%

Some Headset Speakers

010b

028Ah

300 > Impedance < 1275

Some Microphones

011b

03E8h

Impedance = 1275 +/- 25%

Microphones

100b

07D0h

1275 > Impedance < 2000

Microphones

101b

0BB8h

Impedance = 2000 +/- 25%

Amplified Speakers

110b

2710h

> 2000

Amplified Speakers, Line In

111b

2710h

> 2000

Amplified Speakers, Line In

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