92HD005 Datasheet, PDF (52/205 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
Bit
[31:7]
[7]
[6:5]
[4]
[3:0]
Table 63. AFG Supply Command Response Format
Bitfield Name
RW
Reset
Description
Rsvd
R
0x0
Reserved
VAGRamp
An internal power supply anti-pop circuit
prevents audible clicks and pops from being
heard when the CODEC is powered on and
off. This function is accomplished by
delaying the charge/discharge of the VREF
capacitor. A value of C_VREF = 1 µF will
cause a turn-on delay of roughly 3 seconds,
which will allow the power supplies to
stabilize before the CODEC outputs are
RW
0x0
enabled. The recommended value of
C_VREF = 10 µF will extend the delay to
30 seconds. The CODEC outputs are also
kept stable for the same amount of time at
power-off to allow the system to be
gracefully turned off. Setting the VAGRamp
bit speeds up the ramp rate by 10X
(degrading the anti-pop performance), for
easier production testing. Any external
component anti-pop circuit is unaffected by
the internal circuit.
IBIAS
00 = Normal Current
RW
0x0
01 = 80% nominal Analog Current
10 = 120% nominal Analog Current
11 = 140% nominal Analog Current
0 = low-level SPDIF Input (special buffer for
SPDIFPinLvl
RW
0x1
low level signals)
1 = standard SPDIF Input (for high level
signals)
Override
Supply Override Control.
[0] = invert ADC supply
RW
0x0
[1] = invert DAC supply
[2] = supply value
[3] = supply override enable
3.4.2.23. AFG DMicCtrl
Table 64. AFG DMicCtrl Command Verb Format
Verb ID
Payload
Get
FF0
00
Set1
7F0
See bits [7:0] of bitfield table.
Response
See bitfield table.
0000_0000h
IDT™
52
4-CHANNEL HD AUDIO CODEC WITH QUAD DIGITAL MICROPHONE INTERFACE
92HD005/92HD005D
V 1.0 12/06