92HD99B Datasheet, PDF (21/225 Pages) Integrated Device Technology – SINGLE CHIP PC AUDIO SYSTEM

92HD99
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
Figure 3. HP EAPD Example to be replaced by single pin for internal amp
HP AUDIO CONTROL BLOCK DIAGRAM
MUTE +
UP/DOWN
BUTTONS
(MUTE LED ON
SAME BOARD)
SYNC FROM KBC TO OS
OS
SCAN
CODES
KBC
SYNC FROM AUDIO GUI TO KBC
A_EAPD
A_SD
GPIO_1
CODEC
Internal
Headphone
Amp
SD/Mute
Internal BTL
Amp
SD/Mute
EAPD
SPKR_EN#
SPKR AMP
Figure 4. EAPD implementation
VDD
EAPD PIN
Control
CODEC
SMU MUTE
OTHER
SD#
External
Power Amp
2.13. Digital Microphone Support
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 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 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.
IDT CONFIDENTIAL
21
©2009 INTEGRATED DEVICE TECHNOLOGY, INC.
V1.2 1/12
92HD99