92hd81 Integrated Device Technology, 92hd81 Datasheet - Page 37

• Manufacturer Part Number: 92hd81
• Description: Single Chip Pc Audio System
• Manufacturer: Integrated Device Technology

SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
92HD81
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
2.22.3. “Record Path” Port Behavior
EAPD
(pin)
1.default value for Aux Audio Enable is determined by bond option.
1
1
1
1
1
Support
Enable
DAC 0
Digital Microphone input DMIC0 is used as an internal microphone port. The Digital Microphone
clock pin is used as a clock input. The data on the DMIC0 pin is converted into analog audio using
DAC 0 and sent to Port E (Aux Audio Out.) The expected clock input rate is 3.072MHz. Although this
rate is not guaranteed, existing digital microphones are operated from about 1.5-3.2MHz. The
CODEC does not provide gain for the digital microphone path in this mode and external gain of
20-30dB implemented at the output of Port E is expected for acceptable operation. Any DC offset
from the digital microphone is removed by the AC coupling caps required on Port E.
If Port F presence detect = 0, this indicates that nothing is plugged into Aux Audio In and the digital
microphone input is sent to port E. If Port F presence detect = 1, this indicates that an external
source is plugged into the Aux Audio In. The DAC and Port E are disabled.
Aux
1
1
1
1
1
1
Port E
detect
0
1
1
1
1
MixerOutVol
Port B
detect
1
0
0
1
1
DAC0
DAC1
DAC2
Digital PC Beep
Port A
detect
1
0
1
0
1
Analog Beep
DMIC detect
Port C, D, F,
37
Σ
DMIC_0
NA
NA
NA
NA
NA
+0/+10/+20/+30 dB
+0/+10/+20/+30 dB
LO
LO
Boost
Boost
Boost
behavior
disabled
disabled
disabled
disabled
disabled
Port D
DMIC
PORT E
Pin Complex
Pins 15/16
PORT C
Pin Complex
Pins 19/20
Mic Bias
92HD81
(F to mix to B)
(F to mix to B)
(F to mix to B)
DMIC_0
Pin 4
DMIC_CLK
Pin 2
behavior
disabled
disabled
enabled
enabled
enabled
Port B
Aux Audio Out
(Disabled if Port
F in use)
MIC Jack
(Disabled)
(F to mix to A)
(F to mix to A)
(F to mix to A)
PC AUDIO
behavior
disabled
disabled
enabled
enabled
enabled
Port A
V 0.97 01/09