92HD87B2X5NDGXTBX IDT, Integrated Device Technology Inc, 92HD87B2X5NDGXTBX Datasheet - Page 19

• Manufacturer Part Number: 92HD87B2X5NDGXTBX
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 92HD87B2X5NDGXTBX

• Lead Free Status / RoHS Status: Compliant

IDT PROPRIETARY / IDT
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
Power State DMIC Widget
92HD87
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
Digital Mics
D1-D3
D0-D3
2.12. Digital Microphone Support
D0
0
1
2
either DMIC_0 or
Enabled?
Double Edge on
Data Sample
Single Edge
Yes
Yes
No
CONFIDENTIAL
The digital microphone interface permits connection of a digital microphone(s) to the CODEC via the
DMIC0, and DMIC_CLK 3-pin interface. The DMIC0 signal is an input that carry individual channels
of digital microphone data to the ADC. In the event that a single microphone is used, the data is
ported to both ADC channels. This mode is selected using a vendor specific verb and the left time
slot is copied to the ADC left and right inputs.
The DMIC_CLK output is controllable from 4.704Mhz, 3.528Mhz, 2.352Mhz, 1.176Mhz and is syn-
chronous to the internal master clock. The default frequency is 2.352Mhz.
The DMIC data input is reported as a stereo input pin widgets that incorporate a boost amplifier. The
pin widgets are shown connected to the ADCs through the same multiplexors as the analog ports.
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:
N/A
1
Clock Capable Input Capable DMIC_CLK Output is Enabled when either DMIC_0 or Input
DMIC_CLK
Disabled
Disabled
Output
Clock
Clock
ADC Conn.
0, or 1
0, or 1
N/A
Input Disabled DMIC_CLK is HIGH-Z with Weak Pull-down
Input Disabled DMIC_CLK is HIGH-Z with Weak Pull-down
No Digital Microphones
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.
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.
DMIC_0,1
19
Widget is Enabled. Otherwise, the DMIC_CLK remains Low
Notes
92HD87
Notes
PC AUDIO
V 0.95 10/10