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ADS7812UBE4 bảng dữ liệu(PDF) 10 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  Low-Power, Serial 12-Bit Sampling ANALOG-TO-DIGITAL CONVERTER
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Trang chủ  http://www.ti.com
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ADS7812UBE4 bảng dữ liệu(HTML) 10 Page - Texas Instruments

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ADS7812
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INTERNAL DATACLK
With EXT/INT tied LOW, the result from conversion ‘n’ is
serially transmitted during conversion ‘n+1’, as shown in
Figure 5 and with the timing given in Table II. Serial
transmission of data occurs only during a conversion. When
a transmission is not in progress, DATA and DATACLK are
LOW.
During the conversion, the results of the previous conver-
sion will be transmitted via DATA, while DATACLK
provides the synchronous clock for the serial data. The data
format is 12-bit, Binary Two’s Complement, and MSB first.
Each data bit is valid on both the rising and falling edges of
DATACLK. BUSY is LOW during the entire serial trans-
mission and can be used as a frame synchronization signal.
EXTERNAL DATACLK
With EXT/INT tied HIGH, the result from conversion ‘n’ is
clocked out after the conversion has completed, during the
next conversion (‘n+1’), or a combination of these two.
Figure 6 shows the case of reading the conversion result
after the conversion is complete. Figure 7 describes reading
the result during the next conversion. Figure 8 combines the
important aspects of Figures 6 and 7 as to reading part of the
result after the conversion is complete and the remainder
during the next conversion.
The serial transmission of the conversion result is initiated
by a rising edge on DATACLK. The data format is 12-bit,
Binary Two’s Complement, and MSB first. Each data bit is
valid on the falling edge of DATACLK. In some cases, it
t
17
DATACLK
BUSY
CONV
t
1
t
12
t
18
t
16
t
14
t
13
t
15
1
1
2
3
10
11
12
DATA
MSB
Bit 10
Bit 9
Bit 2
Bit 1
LSB
MSB
BUSY
CONV
t
1
t
5
DATACLK
t
4
t
23
t
22
t
21
t
20
t
19
1234
10
11
12
DATA
MSB
Bit 10
Bit 9
Bit 2
Bit 1
LSB
FIGURE 5. Serial Data Timing, Internal Clock (EXT/INT and CS LOW).
FIGURE 6. Serial Data Timing, External Clock, Clocking After the Conversion Completes (EXT/INT HIGH, CS LOW).


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