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參數(shù)資料
| 型號： | AV2636 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 24-bit 192kHz Stereo Audio DAC |
| 中文描述： | 24位192kHz立體聲音頻DAC |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 821K |
| 代理商： | AV2636 |
AV2636
Product Datasheet
DIGITAL AUDIO DATA INTERFACE
The serial audio data is send to the device through a three-wire interface. The interface consists of three
input pins that are serial clock (SC), serial data (SD) and sync-frame (SF). The sync-frame is also a
left/right channel indicator. Three interface formats are supported.
I
2
S mode
Right justified mode
DSP mode
All formats send MSB first. The audio data is in 2’s complement format. The mode selection can be either
in auto-detect mode or programmable mode.
The three-wire digital audio data interface timing specification is shown at the following diagram.
SF
SC
SD
t
SCH
t
SCL
t
SC
t
SFH
t
SFS
t
DCS
t
DCH
The timing characteristics are shown at the following table.
Symbol
t
SC
SC clock cycle time
t
SCH
SC pulse width high
t
SCL
SC pulse width low
t
DCS
SD data setup time relative to SC rising edge
t
DCH
SD data hold time relative to SC rising edge
t
SFH
SF hold time relative to SC rising edge
t
SFS
SF setup time relative to SC rising edge
I
2
S MODE
In I
2
S mode, the serial interface accepts input data at SD pin and frame input at SF pin. The serial
data is time multiplexed with the frame signal SF indicating left and right channel data. SF is low
during left channel data and high during right channel data. The SF is also a timing signal for the
start of each word of left and right channel.
The MSB of the audio data SD is sampled on the second rising edge of SC following SF transition.
Word lengths of 16/18/20/24 bits are supported.
Description
Min
50
20
20
10
10
10
10
Max
Units
ns
ns
ns
ns
ns
ns
ns
AVS Technology, Inc.
www.avstech.com
6-16
August 18, 2004
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