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TLC1549C Datasheet(PDF) 14 Page - Texas Instruments

Part # TLC1549C
Description  10-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TLC1549C Datasheet(HTML) 14 Page - Texas Instruments

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TLC1549C, TLC1549I, TLC1549M
10-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL
SLAS059C – DECEMBER 1992 – REVISED MARCH 1995
14
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
simplified analog input analysis
Using the equivalent circuit in Figure 14, the time required to charge the analog input capacitance from 0 V 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/2048)
Equating equation 1 to equation 2 and solving for time tc gives
(3)
and
tc (1/2 LSB) = Rt × Ci × ln(2048)
(4)
V
S *
V
S
2048
+ V
S
1–e
–tc RtCi
Therefore, with the values given the time for the analog input signal to settle is
(5)
tc (1/2 LSB) = (Rs + 1 kΩ) × 60 pF × ln(2048)
This time must be less than the converter sample time shown in the timing diagrams.
Rs
ri
VS
VC
50 pF MAX
1 k
Ω MAX
Driving Source†
TLC1549
Ci
VI
VI = Input Voltage at ANALOG IN
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 14. Equivalent Input Circuit Including the Driving Source


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