IDT92HD81B1X5NLGXYCX8 IDT, Integrated Device Technology Inc, IDT92HD81B1X5NLGXYCX8 Datasheet - Page 24

• Manufacturer Part Number: IDT92HD81B1X5NLGXYCX8
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT92HD81B1X5NLGXYCX8

• Lead Free Status / RoHS Status: Compliant

92HD81
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
©2009 INTEGRATED DEVICE TECHNOLOGY, INC.
IDT™ CONFIDENTIAL
2.13. Digital Microphone Support
The digital microphone interface permits connection of a digital microphone(s) to the CODEC via the
DMIC0, DMIC1, and DMIC_CLK 3-pin interface. The DMIC0 and DMIC1 signals are inputs 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 two DMIC data inputs are reported as two 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 dig-
ital microphones, 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 digital microphones exactly like an analog microphone.
[10:8]
[6:4]
[3:0]
[7:4]
[3:0]
SmplRateDiv
BitsPerSmpl
NmbrChan
Strm
Ch
Table 7: Mult-channel
24
Sample Base Rate Divisor
000= Divide by 1
001= Divide by 2 (not supported)
010= Divide by 3 (not supported)
011= Divide by 4 (not supported)
100= Divide by 5 (not supported)
101= Divide by 6 (not supported)
110= Divide by 7 (not supported)
111= Divide by 8 (not supported)
Bits per Sample
000= 8 bits (not supported)
001= 16 bits
010= 20 bits
011= 24 bits
100-111= Reserved
Number of Channels
Number of channels for this stream in each “sample
block” of the “packets” in each “frame” on the link.
0000=1 channel (not supported)
0001 = 2 channels
1111= 16 channels.
Software-programmable integer representing link
stream ID used by the converter widget. By conven-
tion stream 0 is reserved as unused.
Integer representing lowest channel used by con-
verter.
0 and 2 are valid Entries
If assigned to the same stream, one ADC must be
assigned a value of 0 and the other ADC assigned a
value of 2.
…
V 0.987 11/09
92HD81