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TLC1551IDWR датащи(PDF) 8 Page - Texas Instruments

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номер детали TLC1551IDWR
подробное описание детали  10-BIT ANALOG-TO-DIGITAL CONVERTERS WITH PARALLEL OUTPUTS
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TLC1550I, TLC1550M, TLC1551I
10BIT ANALOGTODIGITAL CONVERTERS
WITH PARALLEL OUTPUTS
SLAS043G − MAY 1991 − REVISED NOVEMBER 2003
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
simplified analog input analysis
Using the circuit in Figure 2, the time required to charge the analog input capacitance from 0 to VS within 1/2
LSB can be derived as follows:
The capacitance charging voltage is given by
(1)
Where:
Rt = Rs + ri
V
C +
V
S
1−e
–tc RtCi
The final voltage to 1/2 LSB is given by
(2)
VC (1/2 LSB) = VS − (VS/1024)
Equating equation 1 to equation 2 and solving for time t c gives
(3)
and
t c (1/2 LSB) = Rt × Ci × ln(1024)
(4)
V
S *
V
S
512
+ V
S
1– e
–tc RtCi
Therefore, with the values given, the time for the analog input signal to settle is
(5)
t c (1/2 LSB) = (Rs + 1 kΩ) × 60 pF × ln(1024)
This time must be less than the converter sample time shown in the timing diagrams.
Rs
ri
VS
VC
Ci
50 pF MAX
1 k
Ω MAX
Driving Source†
TLC1550/1
VI
VI = Input voltage at AIN
VS = External driving source voltage
Rs = Source resistance
ri = Input resistance
Ci = Input capacitance
† Driving source requirements:
• Noise and distortion for the source must be equivalent to the resolution of the converter.
• Rs must be real at the input frequency.
Figure 2. Input Circuit Including the Driving Source


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