92HD71B8 데이터 시트보기 (PDF) - Integrated Device Technology
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92HD71B8 Datasheet PDF : 216 Pages
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92HD71B7
4-CHANNEL HD AUDIO CODEC OPTIMIZED FOR LOW POWER
PC AUDIO
DAC1 Output: When enabled (by using port connection list), both DAC1 Outputs are summed
together.
Input Mixer: When enabled (by using mono mix connection list and DAC mixer), 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.
1.4.7.
Analog Mixer
An analog mixer is available on the 92HD71B7. The mixer supports independent gain (-34.5 to
+12dB in 1.5dB steps) on each input as well as independent mutes on each input.
The following inputs are available:
• DAC0
• DAC1
• Analog PC_Beep
• Inport0_Mux
• Inport1_Mux
1.4.8.
Input Multiplexers
92HD71B7 implements 2 port input multiplexers. These multiplexers incorporate the microphone
boost function (0, 10dB, 20dB, 30dB, and 40dB gain) as an output amp and allow a preselection of
one of three possible inputs:
Port B
Port C
Port E
NOTE: Changing the Input multiplexer setting will affect both the analog mixer and the ADC.
1.4.9.
ADC Multiplexers
92HD71B7 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
four possible inputs:
• DMIC 0
• DMIC1
• InPortMux (ADC0 selects inport0_mux / ADC1 selects inport1_mux)
• Mixer output
1.4.10.
Power Management
The following table describes what functionality is active in each power state
The D3-default state is available for HD Audio compliance. The programmable values, exposed via
vendor-specific settings, are under the IDT Device Driver control for further power reduction.
IDT™ CONFIDENTIAL AND PROPRIETARY
15
4-CHANNEL HD AUDIO CODEC OPTIMIZED FOR LOW POWER
92HD71B7
V 0.9 07/07
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