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TLC2543-EP Datasheet(PDF) 21 Page - Texas Instruments

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Part No. TLC2543-EP
Description  12-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL AND 11 ANALOG INPUTS
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TLC2543-EP Datasheet(HTML) 21 Page - Texas Instruments

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TLC2543Q1
12BIT ANALOGTODIGITAL CONVERTERS
WITH SERIAL CONTROL AND 11 ANALOG INPUTS
SGLS218D − NOVEMBER 2003 − REVISED MAY 2008
21
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
simplified analog input analysis
Using the equivalent circuit in Figure 18, 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/8192)
Equating equation 1 to equation 2 and solving for time tc gives:
(3)
and
tc (1/2 LSB) = Rt × Ci × ln(8192)
(4)
V
S *
V
S
8192
+ 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(8192)
This time must be less than the converter sample time shown in the timing diagrams.
Rs
ri
VS
VC
60 pF Max
1 k
Ω Max
Driving Source†
TLC2543
Ci
VI
VI = Input Voltage at AIN
VS = External Driving Source Voltage
Rs = Source Resistance
ri = Input Resistance
Ci = Input Capacitance
VC= Capacitance Charging Voltage
† 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.
• Rs must not exceed 1 kΩ.
Figure 18. Equivalent Input Circuit Including the Driving Source


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