92HD81 Datasheet, PDF (36/279 Pages) Integrated Device Technology – SINGLE CHIP PC AUDIO SYSTEM

92HD81
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
EAPD
(pin)
0
1
Aux
Support
Enable¹
NA
Port E
detect
NA
0
NA
Port B
detect
NA
NA
Port A
detect
NA
NA
1
1
0
0
0
1
1
0
0
1
Port C, D, F,
DMIC detect
NA
NA
NA
NA
Port D
behavior
disabled
Widget
controlled
enabled
(F to mix to D)
disabled
1
1
0
1
0
NA
disabled
1
1
0
1
1
NA
1
1
1
0
0
NA
1
1
1
0
1
NA
disabled
disabled
disabled
1
1
1
1
0
NA
disabled
1
1
1
1
1
NA
disabled
1.default value for Aux Audio Enable is determined by bond option.
Port B
behavior
disabled
Widget
controlled
disabled
disabled
enabled
(F to mix to B)
enabled
(F to mix to B)
disabled
disabled
enabled
(F to mix to B)
enabled
(F to mix to B)
Port A
behavior
disabled
Widget
controlled
disabled
enabled
(F to mix to A)
disabled
enabled
(F to mix to A)
disabled
enabled
(F to mix to A)
disabled
enabled
(F to mix to A)
2.23.3. “Record Path” Port Behavior
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.
IDT CONFIDENTIAL
36
©2009 INTEGRATED DEVICE TECHNOLOGY, INC.
V 0.995 01/11
92HD81