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ADS7824 bảng dữ liệu(PDF) 7 Page - Texas Instruments

tên linh kiện ADS7824
Giải thích chi tiết về linh kiện  4 Channel, 12-Bit Sampling CMOS A/D Converter
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nhà sản xuất  TI1 [Texas Instruments]
Trang chủ  http://www.ti.com
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ADS7824 bảng dữ liệu(HTML) 7 Page - Texas Instruments

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ADS7824
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ADS7824
Parallel Output
±10V
+5V
+5V(1)
0.1µF 10µF
+
+
D6
D5
D4
LOW LOW LOW
D9
D8
D11
Pin 21
LOW
D10
D7
D1
D0
D3
Pin 21
HIGH
NOTE: (1) PAR/SER = 5V
D2
LOW
2.2µF
+
2.2µF
+
Convert Pulse
BUSY
R/C
BYTE
40ns min
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ADS7824
Serial Output
±10V
+5V
0.1µF 10µF
+
+
NOTES: (1) DATACLK (pin 15) is an output when EXT/INT (pin 12) is LOW
and an input when EXT/INT is HIGH. (2) NC = no connection. (3) PAR/SER = 0V.
2.2µF
+
2.2µF
+
Convert Pulse
BUSY
SDATA
DATACLK(1)
EXT/INT
SYNC
R/C
40ns min
NC(2)
NC(2)
NC(2)
(3)
BASIC OPERATION
PARALLEL OUTPUT
Figure 1a shows a basic circuit to operate the ADS7824 with
parallel output (Channel 0 selected). Taking R/C (pin 22)
LOW for 40ns (12
µs max) will initiate a conversion. BUSY
(pin 24) will go LOW and stay LOW until the conversion is
completed and the output register is updated. If BYTE (pin
21) is LOW, the 8 most significant bits will be valid when
pin 24 rises; if BYTE is HIGH, the 4 least significant bits
will be valid when BUSY rises. Data will be output in
Binary Two’s Complement format. BUSY going HIGH can
be used to latch the data. After the first byte has been read,
BYTE can be toggled allowing the remaining byte to be
read. All convert commands will be ignored while BUSY is
LOW.
The ADS7824 will begin tracking the input signal at the end
of the conversion. Allowing 25
µs between convert com-
mands assures accurate acquisition of a new signal.
SERIAL OUTPUT
Figure 1b shows a basic circuit to operate the ADS7824 with
serial output (Channel 0 selected). Taking R/C (pin 22)
LOW for 40ns (12
µs max) will initiate a conversion and
output valid data from the previous conversion on SDATA
(pin 16) synchronized to 12 clock pulses output on
DATACLK (pin 15). BUSY (pin 24) will go LOW and stay
LOW until the conversion is completed and the serial data
has been transmitted. Data will be output in Binary Two’s
Complement format, MSB first, and will be valid on both the
rising and falling edges of the data clock. BUSY going
HIGH can be used to latch the data. All convert commands
will be ignored while BUSY is LOW.
The ADS7824 will begin tracking the input signal at the end
of the conversion. Allowing 25
µs between convert com-
mands assures accurate acquisition of a new signal.
FIGURE 1. Basic Connection Diagram, (a) Parallel Output, (b) Serial Output.


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