92hd005 Integrated Device Technology, 92hd005 Datasheet - Page 52

• Manufacturer Part Number: 92hd005
• Description: Four Channel Hd Audio Codec
• Manufacturer: Integrated Device Technology

IDT™
4-CHANNEL HD AUDIO CODEC WITH QUAD DIGITAL MICROPHONE INTERFACE
92HD005/92HD005D
4-CHANNEL HD AUDIO CODEC WITH QUAD DIGITAL MICROPHONE INTERFACE
3.4.2.23. AFG DMicCtrl
[31:7]
[6:5]
[3:0]
Bit
[7]
[4]
Set1
Get
Bitfield Name
SPDIFPinLvl
VAGRamp
Override
IBIAS
Rsvd
Table 63. AFG Supply Command Response Format
Table 64. AFG DMicCtrl Command Verb Format
Verb ID
FF0
7F0
RW
RW
RW
RW
RW
52
R
See bits [7:0] of bitfield table.
Reset
0x0
0x0
0x0
0x1
0x0
Payload
Reserved
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
cause a turn-on delay of roughly 3 seconds,
which will allow the power supplies to
stabilize before the CODEC outputs are
enabled. The recommended value of
C
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.
00 = Normal Current
01 = 80% nominal Analog Current
10 = 120% nominal Analog Current
11 = 140% nominal Analog Current
0 = low-level SPDIF Input (special buffer for
1 = standard SPDIF Input (for high level
Supply Override Control.
[0] = invert ADC supply
[1] = invert DAC supply
[2] = supply value
[3] = supply override enable
00
VREF
low level signals)
signals)
92HD005/92HD005D
= 10 μF will extend the delay to
Description
VREF
See bitfield table.
0000_0000h
Response
= 1 μF will
PC AUDIO
V 1.1 4/08