XR2212 Exar Corporation, XR2212 Datasheet - Page 14

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XR2212

Manufacturer Part Number
XR2212
Description
Precision Phase-Locked Loop
Manufacturer
Exar Corporation
Datasheet

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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.
V
to be detected (equivalent to adjusting V threshold).
XR-2212
IN
minimum (peak) input voltage must exceed this value
Rev. 2.01
Input
Rx
Figure 13. Desensitizing Input Stage
V
REF
Î Î
Î Î
Î Î
11
2
Va
20K
14
V
R
IN
X
V
minimum ( peak )
20, 000 V
Vcc
Vb
2.8 V offset
20K
To Phase
Detector
REF
V
V
REF
1
V
a
–V
(20, 000
b
20, 000
R
X
)
or

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