92HD99B Datasheet, PDF (22/225 Pages) Integrated Device Technology – SINGLE CHIP PC AUDIO SYSTEM

92HD99
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
Although the internal implementation is different between the analog ports and the digital micro-
phones, the functionality is the same. In most cases, the default values for the DMIC clock rate and
data sample phase will be appropriate and an audio driver will be able to configure and use the digi-
tal microphones exactly like an analog microphone.
To conserve power, the analog portion of the ADC will be turned off if the D-mic input is selected.
When switching from the digital microphone to an analog input to the ADC, the analog portion of the
ADC will be brought back to a full power state and allowed to stabilize before switching from the dig-
ital microphone to the analog input. This should take less than 10mS.
DMIC pin widgets support port presence detect directly using SENSE-B input.
The codec supports the following digital microphone configurations:
Digital
Mics
0
Data Sample
N/A
1
Single Edge
2
Double Edge on
either DMIC_0 or 1
ADC
Conn.
N/A
0, or 1
0, or 1
Notes
No Digital Microphones
Available on either DMIC_0 or DMIC_1
When using a microphone that supports multiplexed operation (2-mics can share a
common data line), configure the microphone for “Left” and select mono operation using
the vendor specific verb.
“Left” D-mic data is used for ADC left and right channels.
Available on either DMIC_0 or DMIC_1, External logic required to support sampling on a
single Digital Mic pin channel on rising edge and second Digital Mic right channel on
falling edge of DMIC_CLK for those digital microphones that don’t support alternative
clock edge (multiplexed output) capability.
Table 13. Valid Digital Mic Configurations
Power State
DMIC Widget
Enabled?
D0
Yes
D1-D3
Yes
D0-D3
No
D4
-
D5
-
DMIC_CLK
Output
Clock Capable
Clock Disabled
Clock Disabled
Clock Disabled
Clock Disabled
DMIC_0
Input Capable
Input Disabled
Input Disabled
Input Disabled
Input Disabled
Notes
DMIC_CLK Output is Enabled when DMIC_0 Input Widget is
Enabled. Otherwise, the DMIC_CLK remains Low
DMIC_CLK is HIGH-Z with Weak Pull-down
DMIC_CLK is HIGH-Z with Weak Pull-down
DMIC_CLK is HIGH-Z with Weak Pull-down
DMIC_CLK is HIGH-Z with Weak Pull-down
Table 14. DMIC_CLK and DMIC_0 Operation During Power States
IDT CONFIDENTIAL
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92HD99