參數(shù)資料
型號(hào): XR2211CP
廠商: Exar Corporation
文件頁(yè)數(shù): 11/24頁(yè)
文件大?。?/td> 242K
代理商: XR2211CP
XR-2211
11
Rev. 3.01
f)
The input to the XR-2211 may sometimes be too sensitive to noise conditions on the input line. Figure 4illustrates
a method of de-sensitizing the XR-2211 from such noisy line conditions by the use of a resistor, Rx, connected
from pin 2 to ground. The value of Rx is chosen by the equation and the desired minimum signal threshold level.
V
IN
minimum (peak)
V
a
–V
b
V
2.8mV offset
V
REF
20,000
(20,000
R
X
)or R
X
20,000
V
REF
V
IN
minimum (peak) input voltage must exceed this value to be detected (equivalent to adjusting V threshold)
V
CC
Rx
Input
2
20K
Va
20K
To Phase
Detector
Vb
V
REF
Figure 4. Desensitizing Input Stage
g)
Calculate Data Filter Capacitance, C
F
:
R
sum
(R
F
(R
1
R
1
)·R
B
R
F
R
B
)
C
F
0.25
(R
sum
·Baud Rate)
Baud rate in
1
seconds
Note:
All values except R
0
can be rounded to nearest standard value.
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