92HD005 Datasheet, PDF (19/205 Pages) Integrated Device Technology – 4-CHANNEL HD AUDIO CODEC WITH QUAD DIGITAL MICROPHONE INTERFACE

92HD005/92HD005D
4-CHANNEL HD AUDIO CODEC WITH QUAD DIGITAL MICROPHONE INTERFACE
PC AUDIO
1.3.3. Volume/Digital Microphone/GPIO Selection
For the 92HD005/92HD005D, three functions are available on pins 2 and 3. To determine which
function is actually enabled on these pins, the order of precedence is followed:
1. If the GPIOs are enabled through the Audio Function Group, they override both Volume Control
and Digital Microphones.
2. If the GPIOs are not enabled through the Audio Function Group, then, at reset, the Volume con-
trol is enabled with a weak pull-up.
3. If BIOS or other software application enables either Digital Microphone input through the Config-
uration Default Register, the Volume is disconnected and the pull-ups are disconnected, with the
weak pull-downs enabled.
1.3.4. VRefOut/GPIO Selection
Two functions are available on pins 30 and 31. To determine which function is enabled on the two
pins, the order of precedence followed is:
1. If the GPIOs are enabled, they override VRefOut-E or VRefOut-F.
2. If the GPIOs are not activated through the Audio Function Group, then, at reset, the VRefOut
pins are enabled.
If using the GPIOs as inputs, incorporate 10 KW external pull-ups or the GPI will not function cor-
rectly.
1.3.5. SPDIF Input
SPDIF IN can operate at 44.1 KHz, 48 KHz or 96 KHz, and implements internal Jack Sensing.
A sophisticated digital PLL allows automatic rate detection and accurate data recovery. The ability to
directly accept consumer SPDIF voltage levels eliminates the need for costly external receiver ICs.
Advanced features such as record-slot-select and SPDIF_IN routing to the DAC allow for simulta-
neous record and play.
1.3.6. SPDIF Output
SPDIF Output supports 44.1 KHz, 48 KHz, 88.2 KHz, 96 KHz and 192 KHz sample rates, as defined
in the Intel High Definition Audio Specification, with resolutions up to 24 bits. This insures compatibil-
ity with all consumer audio gear and allows for convenient integration into home theater systems and
media center PCs.
IDT™
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4-CHANNEL HD AUDIO CODEC WITH QUAD DIGITAL MICROPHONE INTERFACE
92HD005/92HD005D
V 1.0 12/06