XR2212 View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XR2212' PDF : 20 Pages View PDF
XR-2212
INPUT SENSITIVITY
The input to the XR-2212 may sometimes be too sensitive
to noise conditions on the input line. Figure 13 illustrates
a method of de-sensitizing the XR-2212 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.
VIN minimum (peak) input voltage must exceed this value
to be detected (equivalent to adjusting V threshold).
VIN minimum (peak) + Va–Vb +
DV " 2.8V
offset
+
VREF
+
20, 000
(20, 000 )
RX)
or
ǒ Ǔ RX + 20, 000
VREF
DV
*
1
Vcc
Input
ÎÎ Va
2
Rx
20K
ÎÎÎÎ VREF 11
To Phase
Detector
Vb
20K
Figure 13. Desensitizing Input Stage
Rev. 2.01
14
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