參數(shù)資料
型號： TLV2543I
廠商： Texas Instruments, Inc.
英文描述： 12-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL AND 11 ANALOG INPUTS
中文描述： 12位模擬數(shù)字轉(zhuǎn)換器與串行控制和11個(gè)模擬輸入
文件頁數(shù)： 20/24頁
文件大?。?/td> 379K
代理商： TLV2543I
TLV2543C, TLV2543I
12-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL AND 11 ANALOG INPUTS
SLAS096B – MARCH 1995 – REVISED OCTOBER 1995
20
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATIONS INFORMATION
simplified analog input analysis
Using the equivalent circuit in Figure 18, the time required to charge the analog input capacitance from 0 to V
S
within 1/2 LSB can be derived as follows:
The capacitance charging voltage is given by
(1)
where
R
t
= R
s
+ r
i
VC
VS1–e–tcRtCi
The final voltage to 1/2 LSB is given by
(2)
V
C
(1/2 LSB) = V
S
– (V
S
/8192)
Equating equation 1 to equation 2 and solving for time t
c
gives
(3)
and
t
c
(1/2 LSB) = R
t
×
C
i
×
ln(8192)
(4)
VS
VS58192
VS1–e–tcRtCi
Therefore, with the values given the time for the analog input signal to settle is
(5)
t
c
(1/2 LSB) = (R
s
+ 1 k
)
×
60 pF
×
ln(8192)
This time must be less than the converter sample time shown in the timing diagrams.
Rs
ri
VS
VC
50 pF MAX
1 k
MAX
Driving Source
TLV2543
Ci
VI
VI= Input Voltage at AIN
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.
Figure 18. Equivalent Input Circuit Including the Driving Source
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