STAC9271 datasheet(21/223 Pages) IDT

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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

3. DETAILED DESCRIPTION

3.1.

Universal JacksTM

IDT’s Universal JacksTM technology allows for the greatest flexibility in board design and implemen-

tation.

For the STAC927x family the Universal JacksTM capabilities are as follows1:

•

Ports A, B, and D support2:

• Headphone Out

• Line Out

• Line In

• Mic with 0/10/20/30/40 dB Mic boost3

•

Ports C, E, F, G, H support2:

• Line Out

• Line In

• Mic with 0/10/20/30/40 dB Mic boost3

• Ports G & H do not have VrefOut Support

Note1: On the STAC927x family, only one function can be selected on each pin pair at a time. For

example, a pin pair cannot be configured as an input and output at the same time. Configuration can

be changed at any time.

Note2: Three Headphones should not be used simultaneously. Performance degradation will occur

when using 2 Headphones simultaneously. See electrical specs for details.

Note3: When the 40dB mic boost feature is enabled, additional gain increases greater than 6dB may

result in significant audio quality degradation of the microphone audio input. In particular, when the

40dB MIC boost is active, the SNR, THD+N and DC offset will significantly degrade regardless of the

input signal level.

3.1.1.

Audio Jack Presence Detect

SENSE_A pin is used to detect the presence of plugs in ports A, B, C, and D. SENSE_B pin is used

to detect the presence of plugs in ports E, F, G, ad H. Refer to the reference design for port detect

circuitry. Select the precision of the resistors used as follows:

Table 1. Impedance Sense

AVDD Nominal

Voltage (+-5%)

Resistor Tolerance

Sense A

(If Port D is used)

Resistor Tolerance

Sense A

(If Port D is not used)

Resistor Tolerance

Sense B

(If Port H is used)

Resistor Tolerance

Sense B

(If Port H is not used)

4.5V

0.50%

3.3V

0.10%

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