92hd99 Integrated Device Technology, 92hd99 Datasheet - Page 21

• Manufacturer Part Number: 92hd99
• Description: Single Chip Pc Audio System Codec+speaker Amplifier+capless Hp+ldo
• Manufacturer: Integrated Device Technology

92HD99
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
IDT CONFIDENTIAL
©2009 INTEGRATED DEVICE TECHNOLOGY, INC.
2.13. Digital Microphone Support
Headphone
SD/Mute
Internal
Amp
CODEC
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.
Figure 3. HP EAPD Example to be replaced by single pin for internal amp
Internal BTL
EAPD PIN
SD/Mute
Control
Amp
(MUTE LED ON
SAME BOARD)
UP/DOWN
BUTTONS
MUTE +
EAPD
HP AUDIO CONTROL BLOCK DIAGRAM
SCAN
CODES
SYNC FROM KBC TO OS
Figure 4. EAPD implementation
SMU MUTE
KBC
VDD
21
SYNC FROM AUDIO GUI TO KBC
A_EAPD
A_SD
SPKR_EN#
GPIO_1
SPKR AMP
OTHER
CODEC
OS
SD#
Power Amp
External
V 0.91 10/10
92HD99