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ADS7818 bảng dữ liệu(PDF) 10 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation. Click here to check the latest version.
tên linh kiện ADS7818
Giải thích chi tiết về linh kiện  2SC5161
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ADS7818 bảng dữ liệu(HTML) 10 Page - Burr-Brown (TI)

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10
®
ADS7818
D11
(MSB)
DATA
HOLD
SAMPLE
SAMPLE
HOLD
CLK
CONV
SAMPLE/HOLD
MODE
POWER MODE
FULL POWER
FULL POWER
LOW POWER
D10
D1
D0
(LSB)
t
CKPD
t
CVPU
t
CVSP
12
3
12
13
t
ACQ
CONVERSION IN PROGRESS
IDLE
IDLE
INTERNAL
CONVERSION
STATE
NOTES: (1) The low power mode (“power-down”) is entered when CONV remains LOW during the conversion and is still LOW at the
start of the 13th clock cycle. (2) The low power mode is exited when CONV goes HIGH. (3) When in power-down, the transition from
hold mode to sample mode is initiated by CONV going HIGH.
(1)
(2)
(3)
FIGURE 4. Power-down Timing.
D11
(MSB)
DATA
CONVERSION IN PROGRESS
IDLE
LOW...
IDLE
CLK
CONV
POWER MODE
FULL POWER
LOW POWER
D10
D1
D0
(LSB)
1
2
3
1213
14
2324
D1
D10
D11
(MSB)
INTERNAL
CONVERSION
STATE
t
CVDD
t
CKCS
t
CKCH
t
CVPD
t
CVH
HOLD
SAMPLE
SAMPLE/HOLD
MODE
NOTES: (1) The serial data can be transmitted LSB first by pulling CONV LOW during the 13th clock cycle. (2) After the MSB has been
transmitted, the DATA output pin will remain LOW until CONV goes HIGH. (3) When CONV is taken LOW to initiate the LSB first transfer,
the converter enters the power-down mode.
(1)
(2)
(3)
FIGURE 5. Serial Data “LSB-First” Timing.
In contrast, the second method (clocking at a fixed rate)
means that each conversion takes X clock cycles. As the
time between conversions get longer, the converter remains
in power-down an increasing percentage of time. This re-
duces total power consumption by a considerable amount.
For example, a 50kHz conversion rate results in roughly
1/10 of the power (minus the reference) that is used at a
500kHz conversion rate.


Số phần tương tự - ADS7818

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
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