參數(shù)資料
型號(hào): AD7813
廠商: Analog Devices, Inc.
英文描述: 8-/10-Bit Sampling ADC(400kSPS,8位/10位采樣A/D轉(zhuǎn)換器)
中文描述: 8-/10-Bit采樣ADC(以其400 kSPS,8位/ 10位采樣的A / D轉(zhuǎn)換器)
文件頁數(shù): 9/12頁
文件大?。?/td> 232K
代理商: AD7813
AD7813
–9–
REV. 0
PARALLEL INTERFACE
The parallel interface of the AD7813 is eight bits wide. The
output data buffers are activated when both
CS
and
RD
are
logic low. At this point the contents of the data register are
placed on the 8-bit data bus. Figure 15 shows the timing dia-
gram for the parallel port. As previously explained, two succes-
sive read operations must take place in order to access the 10-bit
conversion result. The first read places the 8 MSBs on the data
bus and the second read places the 2 LSBs on the data bus. The
2 LSBs appear on DB7 and DB6, with DB5–DB0 set to logic zero.
Further read operations will access the 8 MSBs and 2 LSBs of
the 10-bit ADC conversion result again. The parallel interface
of the AD7813 is reset when BUSY goes logic high. This feature
allows the AD7813 to be used as an 8-bit converter if the user
only wishes to access the 8 MSBs of the conversion. Care must
be taken to ensure that a read operation does not occur while
BUSY is high. Data read from the AD7813 while BUSY is high
will be invalid. For optimum performance the read operation
should end at least 100 ns (t
10
) prior to the falling edge of the
next
CONVST
.
8 MSBs
t
1
t
2
t
3
t
POWER-UP
EXT
INT
BUSY
/
DB7–DB0
2 LSBs
Figure 13. Mode 1 Operation
8 MSBs
t
1
t
3
EXT
INT
BUSY
/
DB7–DB0
t
POWER-UP
Figure 14. Mode 2 Operation
BUSY
DB7–DB0
t
2
t
3
t
1
t
4
t
6
t
7
t
5
t
8
t
9
8 MSBs
2 MSBs
Figure 15. Parallel Port Timing
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