參數(shù)資料
型號： TLC2543MDBREP
廠商： TEXAS INSTRUMENTS INC
元件分類： ADC
英文描述： 11-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
封裝： GREEN, PLASTIC, SSOP-20
文件頁數(shù)： 14/28頁
文件大?。?/td> 524K
代理商： TLC2543MDBREP
www.ti.com
Simplified Analog Input Analysis
V
C + VS 1 * e
*tc RtCi
(1)
VC (1/2 LSB) = VS (VS/8192)
(2)
V
S * VS 8192 + VS 1 * e
*tc RtCi
(3)
tc (1/2 LSB) = Rt × Ci × ln(8192)
(4)
tc (1/2 LSB) = (Rs + 1 k) × 60 pF × ln(8192)
(5)
Rs
ri
VS
VC
60 pF Max
1 k
Max
Driving Source(A)
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
12-BIT ANALOG-TO-DIGITAL CONVERTER
WITH SERIAL CONTROL AND 11 ANALOG INPUTS
SGLS125A – JULY 2002 – REVISED NOVEMBER 2006
APPLICATION INFORMATION (continued)
Using the equivalent circuit in Figure 18, the time required to charge the analog input capacitance from 0 V to VS
within one-half LSB can be derived as follows:
The capacitance charging voltage is given by:
Where:
R
t = Rs + ri
The final voltage to 1/2 LSB is given by:
Equating equation 1 to equation 2 and solving for time tc gives
and
Therefore, with the values given, the time for the analog input signal to settle is:
This time must be less than the converter sample time shown in the timing diagrams.
A.
Driving source requirements:
Noise and distortion for the source must be equivalent to the resolution of the converter.
R
s must be real at the input frequency.
Figure 18. Equivalent Input Circuit Including the Driving Source
21
相關(guān)PDF資料
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TLC2543QDWREP 11-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
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