參數(shù)資料
型號(hào)： TLC2543MEP
廠商： Texas Instruments, Inc.
英文描述： 12-BIT ANALOG-TO-DIGITAL CONVERTER WITH SERIAL CONTROL AND 11 ANALOG INPUTS
中文描述： 12位模擬數(shù)字轉(zhuǎn)換串行控制和11個(gè)模擬輸入
文件頁數(shù)： 21/25頁
文件大?。?/td> 364K
代理商： TLC2543MEP
www.ti.com
Simplified Analog Input Analysis
Using the equivalent circuit in
Figure 18
, the time required to charge the analog input capacitance from 0 V to V
S
within one-half LSB can be derived as follows:
V
C
V
S
1
e
tcRtCi
(1)
V
C
(1/2 LSB) = V
S
(V
S
/8192)
(2)
V
S
V
S
8192
V
S
1
e
tcRtCi
(3)
t
c
(1/2 LSB) = R
t
×
C
i
×
ln(8192)
(4)
t
c
(1/2 LSB) = (R
s
+ 1 k
)
×
60 pF
×
ln(8192)
(5)
R
s
r
i
V
S
V
C
60 pF Max
1 k
Max
Driving Source
(A)
TLC2543
C
i
V
I
V
I
= Input Voltage at AIN
V
S
= External Driving Source Voltage
R
s
= Source Resistance
r
i
= Input Resistance
C
i
= Input Capacitance
V
C
= Capacitance Charging Voltage
TLC2543-EP
12-BIT ANALOG-TO-DIGITAL CONVERTER
WITH SERIAL CONTROL AND 11 ANALOG INPUTS
SGLS125A–JULY 2002–REVISED NOVEMBER 2006
APPLICATION INFORMATION (continued)
The capacitance charging voltage is given by:
Where:
R
t
= R
s
+ r
i
The final voltage to 1/2 LSB is given by:
Equating equation 1 to equation 2 and solving for time t
c
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
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相關(guān)PDF資料
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