STAC9271 Datasheet, PDF (21/223 Pages) Integrated Device Technology – 10-CHANNEL HIGH DEFINITION AUDIO CODEC

STAC9271/9272/9273/9274
10-CHANNEL HIGH DEFINITION AUDIO CODEC
PC AUDIO
3. DETAILED DESCRIPTION
3.1. Universal Jacks^TM
IDT’s Universal Jacks^TM technology allows for the greatest flexibility in board design and implemen-
tation.
For the STAC927x family the Universal Jacks^TM 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:
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)
5V
1%
1%
1%
1%
4.5V
1%
1%
1%
1%
4V
0.50%
1%
0.50%
1%
3.3V
0.10%
1%
0.10%
1%
Table 1. Impedance Sense
IDT™ 10-CHANNEL HIGH DEFINITION AUDIO CODEC
21
IDT CONFIDENTIAL
STAC9271/9272/9273/9274 V 1.0 MARCH2007