參數(shù)資料
型號： TLC541I
廠商： Texas Instruments, Inc.
英文描述： 8-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL AND 11 INPUTS
中文描述： 8位模擬到數(shù)字與串行控制和11變換器輸入端
文件頁數(shù)： 8/11頁
文件大?。?/td> 164K
代理商： TLC541I
TLC540I, TLC541I
8-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL AND 11 INPUTS
SLAS065A – OCTOBER 1983 – REVISED MARCH 1995
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
simplified analog input analysis
Using the equivalent circuit in Figure 1, 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
/512)
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(512)
(4)
VS
VS512
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(512)
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
TLC540/1
Ci
VI
VI= Input Voltage at INPUT 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 1. Equivalent Input Circuit Including the Driving Source
相關PDF資料
PDF描述
TLC542(中文) 8-Bit Analog-To-Digital Converters With Serial Control And 11 Inputs(串行控制，40ksps,12通道，8位ADC)
TLC542C 8-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL AND 11 INPUTS
TLC542I 8-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL AND 11 INPUTS
TLC545(中文) 8-Bit Analog-To-Digital Converters With Serial Control And 11 Inputs(串行控制，76ksps,20通道，8位ADC)
TLC546(中文) 8-Bit Analog-To-Digital Converters With Serial Control And 11 Inputs(串行控制，40ksps,20通道，8位ADC)
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