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92HD73C

SIX CHANNEL HD AUDIO CODEC

Integrated Device Technology 

92HD73C

SIX CHANNEL HD AUDIO CODEC, PREMIUM WLP 3/4 COMPLIANT

PC AUDIO

AFG Power

State

D0-D2

D3

Input Enable Output Enable

Mute

Port Behavior

1

1

-

Not allowed. Port becomes input.

1

0

-

Active - port enabled as input

0

1

0

Active - port enabled as output

0

1

1

Mute - port enabled as output but drives silence

0

0

-

Inactive - Port keeps coupling caps charged (same

as mute.)

-

-

Inactive (lower power) - Port keeps output coupling

caps charged but consumes less power.

Table 2. Analog I/O Port Behavior

1.4.3.

Jack Detect

Plugs inserted to a jack on Ports A, B, C, & D are detected using SENSE_A. Plugs inserted to a jack

on Ports E, F, G, and H are detected using SENSE_B. The following table summarizes the proper

resistor tolerances for different analog supply voltages.

SENSE_C, is different from SENSE_A and SENSE_B. Because SENSE_C only determines the

presence of a plug for the CD port (port I), SENSE_C is a simple digital input pin referenced to the

analog supply. An internal pull-up resistor is provided. No external resistors are needed (jack switch

shorts to ground when a plug is inserted.) If external components are added, or if the pin is driven by

a logic gate, care should be taken to ensure that the pin voltage is above 70% of AVDD when no

plug is in the jack and less than 30% AVDD when a plug is inserted

AVdd Nominal

Voltage (+/- 5%)

5V

4.75V

4V

3.3V

Resistor Tolerance Resistor Tolerance

SENSE_A

SENSE_A

(If port D used) (If port D is not used)

Resistor Tolerance

SENSE_B

(If port H used)

1%

1%

1%

1%

1%

1%

0.50%

1%

0.50%

0.10%

1%

0.10%

Table 3: SENSE Resistor Tolerance

Resistor Tolerance

SENSE_B

(If port H is not used)

1%

1%

1%

1%

See reference design for more information on Jack Detect implementation.

1.4.4.

SPDIF Output

All SPDIF Outputs can operate at 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4KHz, and 192KHz as

defined in the Intel High Definition Audio Specification with resolutions up to 24 bits. This insures

compatibility with all consumer audio gear and allows for convenient integration into home theater

systems and media center PCs.

A second independant SPDIF Output is provided as an option for WLP compliant HDMI and SPDIF

outputs. Its function is identical to the primary SPDIF output.

14

SIX CHANNEL HD AUDIO CODEC, PREMIUM WLP 3/4 COMPLIANT

92HD73C

V 1.3 08/11

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