參數(shù)資料
型號： TLC1543QDWREP
廠商： TEXAS INSTRUMENTS INC
元件分類： ADC
英文描述： 11-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
封裝： GREEN, PLASTIC, SOIC-20
文件頁數(shù)： 11/25頁
文件大小： 573K
代理商： TLC1543QDWREP
TLC1542EP, TLC1543EP
10BIT ANALOGTODIGITAL CONVERTERS WITH
SERIAL CONTROL AND 11 ANALOG INPUTS
SGLS152A JANUARY 2004 REVISED FEBRUARY 2006
19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
simplified analog input analysis
Using the equivalent circuit in Figure 17, 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 1e
t c/RtCi
(
)
(1)
where
Rt = Rs + ri
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:
VS (VS/2048) = VS 1e
(
)
(3)
t c/RtCi
and
tc (1/2 LSB) = Rt × Ci × ln(2048)
(4)
Therefore, with the values given the time for the analog input signal to settle is:
(5)
tc (1/2 LSB) = (Rs + 1 k) × 60 pF × ln(2048)
This time must be less than the converter sample time shown in the timing diagrams.
Rs
ri
VS
VC
1 k
MAX
Driving Source
TLC1542/3
Ci
50 pF MAX
VI
VI = Input Voltage at A0 A10
VS = External Driving Source Voltage
Rs = Source Resistance
ri = Input Resistance
Ci = Equivalent 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 17. Equivalent Input Circuit Including the Driving Source
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