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ADS7813 bảng dữ liệu(PDF) 9 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation. Click here to check the latest version.
tên linh kiện ADS7813
Giải thích chi tiết về linh kiện  Low-Power, Serial 16-Bit Sampling ANALOG-TO-DIGITAL CONVERTER
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ADS7813 bảng dữ liệu(HTML) 9 Page - Burr-Brown (TI)

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®
ADS7813
BINARY TWO’S COMPLEMENT
DIGITAL OUTPUT
TABLE III. Ideal Input Voltage and Corresponding Digital Output for Two Common Input Ranges.
DESCRIPTION
ANALOG INPUT
Full-Scale Range
±10V
0.5V to 4.5V
Least Significant Bit (LSB)
305
µV61µV
BINARY CODE
HEX CODE
+Full Scale –1LSB
9.999695V
4.499939V
0111 1111 1111 1111
7FFF
Midscale
0V
2.5V
0000 0000 0000 0000
0000
Midscale –1LSB
–305
µV
2.499939
µV
1111 1111 1111 1111
FFFF
–Full Scale
–10V
0.5V
10000 0000 0000 0000
8000
Q
D
S0
Q
Update of the shift
register occurs just prior
to BUSY Rising(1)
D
S1
Q
D
S2
Q
D
S14
Q
D
S15
Q
Shift Register
Working Register
Converter Core
D
SOUT
Q
D
W0
Q
Each flip-flop in the
working register is
latched as the
conversion proceeds
D
W1
Q
D
W2
Q
D
W14
Q
D
W15
•••
Delay
DATA
BUSY
DATACLK
CDAC
Control Logic
Clock
REF
EXT/INT
CONV
CS
NOTE: (1) If EXT/INT is HIGH (external clock), DATACLK is HIGH, and CS is LOW during
this time, the shift register will not be updated and the conversion result will be lost.
FIGURE 3. Block Diagram of the ADS7813’s Digital Inputs and Outputs.
READING DATA
The ADS7813’s digital output is in Binary Two’s Comple-
ment (BTC) format. Table III shows the relationship be-
tween the digital output word and the analog input voltage
under ideal conditions.
Figure 3 shows the relationship between the various digital
inputs, digital outputs, and internal logic of the ADS7813.
Figure 4 shows when the internal shift register of the
ADS7813 is updated and how this relates to a single conver-
sion cycle. Together, these two figures point out a very
important aspect of the ADS7813: the conversion result is
not available until after the conversion is complete. The
implications of this are discussed in the following sections.
FIGURE 4. Timing of the Shift Register Update.
CONV
t
6 – t25
t
25
BUSY
NOTE: Update of the internal shift register occurs in the
shaded region. If EXT/INT is HIGH, then DATACLK
must be LOW or CS must be HIGH during this time.


Số phần tương tự - ADS7813

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Mô tả tương tự - ADS7813

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