參數(shù)資料
型號(hào): AD7675ASTRL
廠商: ANALOG DEVICES INC
元件分類(lèi): ADC
英文描述: 16-Bit, 100 kSPS, Differential ADC
中文描述: 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, PQFP48
封裝: 1.40 MM HEIGHT, PLASTIC, MS-026BBC, LQFP-48
文件頁(yè)數(shù): 15/20頁(yè)
文件大?。?/td> 399K
代理商: AD7675ASTRL
REV. 0
AD7675
15
t
3
BUSY
CS
,
RD
CNVST
SYNC
SCLK
SDOUT
1
2
3
14
15
16
D15
D14
D2
D1
D0
X
EXT/
INT
= 0
RDC/SDIN = 0
INVSCLK = INVSYNC = 0
t
14
t
20
t
15
t
16
t
22
t
23
t
29
t
28
t
18
t
19
t
21
t
30
t
25
t
24
t
26
t
27
Figure 17. Master Serial Data Timing for Reading (Read after Convert)
RDC/SDIN = 1
INVSCLK = INVSYNC = 0
D15
D14
D2
D1
D0
X
1
2
3
14
15
16
t
18
BUSY
SYNC
SCLK
SDOUT
CS
,
RD
CNVST
t
3
t
1
t
17
t
14
t
15
t
19
t
20
t
21
t
16
t
22
t
23
t
24
t
27
t
26
t
25
EXT/
INT
= 0
Figure 18. Master Serial Data Timing for Reading (Read Previous Conversion during Convert)
SERIAL INTERFACE
The AD7675 is configured to use the serial interface when the
SER/
PAR
is held high. The AD7675 outputs 16 bits of data,
MSB first, on the SDOUT pin. This data is synchronized with
the 16 clock pulses provided on the SCLK pin.
MASTER SERIAL INTERFACE
Internal Clock
The AD7675 is configured to generate and provide the serial
data clock SCLK when the EXT/
INT
pin is held low. The AD7675
also generates a SYNC signal to indicate to the host when the
serial data is valid. The serial clock SCLK and the SYNC signal
can be inverted if desired. The output data is valid on both the
rising and falling edge of the data clock. Depending on RDC/
SDIN input, the data can be read after each conversion, or
during the following conversion. Figure 17 and Figure 18 show
the detailed timing diagrams of these two modes.
Usually, because the AD7675 has a longer acquisition phase
than the conversion phase, the data is read immediately after
conversion. That makes the mode master, read after conversion,
the most recommended serial mode when it can be used.
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