92HD81 Datasheet, PDF (17/279 Pages) Integrated Device Technology – SINGLE CHIP PC AUDIO SYSTEM

92HD81
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
2.2. Mono Output
The MONO Output has an independent mute (see the Widget listing for details). The MONO Output
derives its input from the output of the summing node after the mono mux. The following sources are
available for the mono pin:
• DAC0 Output: When selected (by using port connection list), both DAC0 outputs are summed
together.
• DAC1 Output: When selected (by using port connection list), both DAC1 outputs are summed
together.
• Mixer Output: When selected (by using port connection list), both mixer outputs are summed
together.
The stereo inputs are scaled by -6dB and then summed to provide an output that is the average of
the two inputs. The full scale output at mono out is designed to be about 0dBV. It is not possible to
adjust to a +3dBV output level.
2.3. Analog 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 E
• Port F
2.4. ADC Multiplexers
The 92HD81 codec implements 2 ADC input multiplexers. These multiplexers incorporate the ADC
record gain function (0 to +22.5dB gain in 1.5dB steps) as an output amp and allow a preselection of
one of 7 possible inputs:
• Port A
• Port C
• Port E
• Port F
• Mixer Output
• DMIC 0
• DMIC 1
2.5. Power Management
The HD Audio specification defines power states, power state widgets, and power state verbs.
Power management is implemented at several levels. The Audio Function Group (AFG) , all con-
verter widgets, and all pin complexes support the power state verb F05/705. Converter widgets are
active in D0 and inactive in D1-D3.
The following table describes what functionality is active in each power state.
IDT CONFIDENTIAL
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©2009 INTEGRATED DEVICE TECHNOLOGY, INC.
V 0.995 01/11
92HD81