92HD99B Datasheet, PDF (13/225 Pages) Integrated Device Technology – SINGLE CHIP PC AUDIO SYSTEM

92HD99
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
2.1.2. Vref_Out
Ports C, & A support Vref_Out pins for biasing electret cartridge microphones. Settings of 80%
AVDD, 50% AVDD, GND, and Hi-Z are supported. Attempting to program a pin widget control with a
reserved or unsupported value will cause the associated Vref_Out pin to assume a Hi-Z state and
the pin widget control Vref_En field will return a value of ‘000’ (Hi-Z) when read.
2.1.3. Jack Detect
Plugs inserted to a jack on Ports A, B, C are detected using SENSE_A. Plugs inserted to a jack on
Port F, DMIC0, are detected using SENSE_B. Per HDA015-B, the detection circuit operates when
the CODEC is in D0 - D3 and can also operate if both the CODEC and Controller are in D3 (no bus
clock.) Jack detection requires that all supplies (analog and digital) are active and stable. When
AVDD is not present, the value reported in the pin widget is invalid.
When the HD Audio bus is in a low power state (reset asserted and clock stopped) the CODEC will
generate a Power State Change Request when a change in port connectivity is sensed and then
generate an unsolicited response after the HD Audio link has been brought out of a low power state
and the device has been enumerated. Per HDA015-B, this will take less than 10mS.
The following table summarizes the proper resistor tolerances for different analog supply voltages..
AVdd Nominal
Voltage (+/- 5%)
4.75V
Resistor Tolerance
Pull-Up
1%
Resistor Tolerance
SENSE_A/B
1%
Resistor
39.2K
20.0K
10.0K
5.11K
2.49K
SENSE_A
PORT A (HP0)
PORT B (HP1)
PORT C
SENSE_B
PORT F
DMIC0
Pull-up to AVDD
Pull-up to AVDD
Table 3. 48pin Jack Detect
See reference design for more information on Jack Detect implementation.
2.2. Mixer
The mixer supports independent gain (-34.5 to +12dB in 1.5dB steps) on each input as well as inde-
pendent mutes on each input. The following inputs are available:
• Port A
• Port C
• Port F
• DAC 0
• DAC 1
IDT CONFIDENTIAL
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©2009 INTEGRATED DEVICE TECHNOLOGY, INC.
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92HD99