參數(shù)資料
型號: DSD1794DBR
廠商: Texas Instruments, Inc.
英文描述: 24-BIT, 192-kHz SAMPLING, ADVANCED SEGMENT, AUDIO STRRO DIGITAL-TO-ALALOG CONVERTER
中文描述: 24位192 kHz的采樣,高級分段,音頻STRRO數(shù)字至ALALOG轉(zhuǎn)爐
文件頁數(shù): 21/47頁
文件大?。?/td> 417K
代理商: DSD1794DBR
SLES077A MARCH 2003 REVISED NOVEMBER 2003
www.ti.com
21
Transmitter
M
M
M
S
M
S
M
M
M
S
S
M
M
M
Data Type
St
Slave Address
W
ACK
Reg Address
ACK
Sr
Slave Address
R
ACK
Data
ACK
NACK
Sp
M
: Master Device
S
: Slave Device
St: Start Condition
Sr: Repeated Start Condition
ACK: Acknowledge
Sp: Stop Condition
NACK: Not Acknowledge
W: Write
R: Read
NOTE: The slave address after the repeat start condition must be the same as the previous slave address.
Figure 31. Read Operation
Noise Suppression
The DSD1794 incorporates noise suppression using the system clock (SCK). However, there must be no more than
two noise spikes in 600 ns. The noise suppression works for SCK frequencies between 8 MHz and 40 MHz in fast
mode. However, it works incorrectly in the following conditions.
Case 1:
1.
t
(SCK)
> 120 ns (t
(SCK)
: period of SCK)
2.
t
(HI)
+ t
(DHD)
< t
(SCK)
×
5
3.
Spike noise exists on the first half of the SCL HIGH pulse.
4.
Spike noise exists on the SDA HIGH pulse just before SDA goes LOW.
SCL
SDA
Noise
When these conditions occur at the same time, the data is recognized as LOW.
Case 2:
1.
t(
SCK)
> 120 ns
2.
t
(SHD)
or t
(RSHD)
< t
(SCK)
×
5
3.
Spike noise exists on both SCL and SDA during the hold time.
SCL
SDA
Noise
When these conditions occur at the same time, the DSD1794 fails to detect a start condition.
Case 3:
1.
t
(SCK)
< 50 ns
2.
t
(SP)
> t
(SCK)
3.
Spike noise exists on SCL just after SCL goes LOW.
4.
Spike noise exists on SDA just before SCL goes LOW.
SCL
SDA
Noise
When these conditions occur at the same time, the DSD1794 erroneously detects a start or stop condition.
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