XR2211 View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XR2211' PDF : 24 Pages View PDF
XR-2211
f) The input to the XR-2211 may sometimes be too sensitive to noise conditions on the input line. Figure 4 illustrates
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.
ǒ Ǔ VIN
minimum
(peak) +
Va–Vb + DV " 2.8mV
offset
+
VREF
20, 000
(20, 000 )
RX)
or
RX + 20, 000
VREF
DV
–1
VIN minimum (peak) input voltage must exceed this value to be detected (equivalent to adjusting V threshold)
VCC
Input
ÎÎ Va
2
Rx
20K
ÎÎÎÎ VREF 10
To Phase
Detector
Vb
20K
Figure 4. Desensitizing Input Stage
g) Calculate Data Filter Capacitance, CF:
Rsum
+
(RF ) R1)·RB
(R1 ) RF ) RB)
CF
+
0.25
(Rsum·Baud
Rate)
Baud
rate
in
1
seconds
Note: All values except R0 can be rounded to nearest standard value.
Rev. 3.01
11
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