參數(shù)資料
型號(hào)： TLC548C
廠商： Texas Instruments, Inc.
英文描述： 8-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL
中文描述： 8位模擬數(shù)字轉(zhuǎn)換器與串行控制
文件頁(yè)數(shù)： 7/12頁(yè)
文件大?。?/td> 167K
代理商： TLC548C
TLC548C, TLC548I, TLC549C, TLC549I
8-BIT ANALOG-TO-DIGITAL CONVERTERS
WITH SERIAL CONTROL
SLAS067C – NOVEMBER 1983 – REVISED SEPTEMBER 1996
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATIONS INFORMATION
simplified analog input analysis
Using the equivalent circuit in Figure 2, 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
V
C
= V
S
1–e–t
c
/R
t
C
i
)
(1)
where
R
t
= R
s
+ r
i
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
V
S
–(V
S
/512) = V
S
1–e
(3)
–t
c
/R
t
C
i
)
and
t
c
(1/2 LSB) = R
t
×
C
i
×
ln(512)
Therefore, with the values given the time for the analog input signal to settle is
(4)
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.
(5)
Rs
ri
VS
VC
1 k
MAX
Driving Source
TLC548/9
VI
VI= Input Voltage at ANALOG IN
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.
Ci
55 pF MAX
Figure 2. Equivalent Input Circuit Including the Driving Source
相關(guān)PDF資料
PDF描述
TLC548I 8-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL
TLC549C 8-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL
TLC549I 8-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL
TLE2027AMFK RES 10.0-OHM 1% 0.063W 100PPM THK-FILM SMD-0402 TR-7-PA2MM
TLE2027MFK EXCALIBUR LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
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