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PI7VD9004ABH Datasheet(PDF) 14 Page - Pericom Semiconductor Corporation

Part No. PI7VD9004ABH
Description  Adaptive EQ 4-channel 960H Video Decoder
Download  53 Pages
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Maker  PERICOM [Pericom Semiconductor Corporation]
Homepage  http://www.pericom.com
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PI7VD9004ABH Datasheet(HTML) 14 Page - Pericom Semiconductor Corporation

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PI7VD9004ABH
Adaptive EQ 4-channel 960H Video Decoder
Pericom Semiconductor Corporation  
14 
www.pericom.com     
 
4.8
ANALOG AUDIO INPUT
The audio ADC offers 5 channels of analog inputs (LINE_INx, x= 0, 1, 2, 3, 4) with a peak-to-peak voltage range from 0.5V
to 2V. Each input channel contains 4-bit programmable gain amplifier and an ADC with maximum over-sampling speed of
3.6M Sample/s. A pseudo differential input is used to minimize board level noise problems. The converted audio data
stream is fed into a low pass filter to decimate audio sample at an appropriate audio sampling rate such as 8 KHz, 16 KHz,
32 KHz, 44.1 KHz and 48 KHz etc.
4.9
AUDIO PROCESSING
The audio processor accepts 5 digital audio streams from audio ADC. It also receives 2 additional digital serial audio data
from pins. One digital serial audio data is SDIN_P coming from AV compression processor, while the other one is
SD_LINKI coming from companion device.
SDIN_P represents the decompressed audio data for playback purpose. SD_LINKI is used to cascade with as many as 12 or
15 digital audio outputs from three other PI7VD9004ABH chips for forming one timing multiplexed I2S digital serial audio
data containing 16 or 20 digital audio channels. This device processes these 5 digital audio streams and 2 digital serial audio
data, then generates one mixing analog audio signal and three digital serial audio data to fulfill the functions of mixing,
recording and cascading etc.
For audio mixing, this device has both analog and digital format. The built-in mixer selects among all audio input data to
generate the mixing digital audio data (SDOUT_M), which connects to audio DAC for converting to mixing analog audio
signal output (LINE_OUT).
For audio recording, the audio processor performs multiplexing over 12 or 15 digital audio streams in timing division way
to generate record digital audio output data (SDOUT_R). For the digital serial audio data SDOUT_R and SDOUT_M, they
are both synchronized with SCLK_R and LRCK_R. As to SDIN_P, it is synchronized with SCLK_P and LRCK_P. These
digital serial audio data support two formats of I2S and DSP that can be selected by control bits RM_SYNC in the register
at offset 0xD2 and PB_SYNC in the register at offset 0xDB. Meanwhile, the record and playback digital serial audio
interfaces of PI7VD9004A(A/B/C)H can be acted as Master or Slave mode based upon the setting of ACLKRMASTER and
PB_MASTER bits in the register at offset 0xDB
Figure 4-2Time-multiplexed format with 54/72MHz
13-0174


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