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TLC1550IFN Datasheet(PDF) 7 Page - Texas Instruments

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No. de pieza TLC1550IFN
Descripción Electrónicos  10-BIT ANALOG-TO-DIGITAL CONVERTERS WITH PARALLEL OUTPUTS
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TLC1550IFN Datasheet(HTML) 7 Page - Texas Instruments

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TLC1550I, TLC1550M, TLC1551I
10-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH PARALLEL OUTPUTS
SLAS043C – MAY 1991 – REVISED MARCH 1995
2–7
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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