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TLC548CD Datasheet(PDF) 7 Page - Texas Instruments

No. de pieza TLC548CD
Descripción Electrónicos  8-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL
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TLC548C, TLC548I, TLC549C, TLC549I
8-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL
SLAS067C – NOVEMBER 1983 – REVISED SEPTEMBER 1996
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATIONS INFORMATION
simplified analog input analysis
Using the equivalent 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
VC = VS 1–e
–tc/RtCi
(
)
(1)
where
Rt = Rs + ri
The final voltage to 1/2 LSB is given by
(2)
VC (1/2 LSB) = VS – (VS/512)
Equating equation 1 to equation 2 and solving for time tc gives
VS –(VS/512) = VS 1–e
(3)
–tc/RtCi
(
)
and
tc (1/2 LSB) = Rt × Ci × ln(512)
(4)
Therefore, with the values given the time for the analog input signal to settle is
tc (1/2 LSB) = (Rs + 1 kΩ) × 60 pF × ln(512)
(5)
This time must be less than the converter sample time shown in the timing diagrams.
Rs
ri
VS
VC
1 k
Ω MAX
Driving Source†
TLC548/9
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.
Ci
55 pF MAX
Figure 2. Equivalent Input Circuit Including the Driving Source


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