XR2211 View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XR2211' PDF : 24 Pages View PDF
XR-2211
6. FSK Data filter time constant, tF:
tF +
(
RB
RB
· RF
) RF)
·CF
(seconds)
7. Loop phase detector conversion gain, Kd: (Kd is the differential DC voltage across pin 10 and pin11, per unit of
phase error at phase detector input):
ƪ ƫ Kd
+
VREF · R1
10, 000·p
volt
radian
Note: For derivation/explanation of this equation, please see TAN-011.
8. VCO conversion gain, Ko: (Ko is the amount of change in VCO frequency, per unit of DC voltage change at pin 11):
ǒ Ǔ K0 +
–2p
VREF ·C0 · R1
+
radianńsecond
volt
9. The filter transfer function:
F(s) +
1)
1
SR1·C1
at
0
Hz.
S = Jw and w = 0
10. Total loop gain. KT:
ǒ Ǔƪ ƫ KT + KO·Kd·F(s) +
RF
5, 000·C0·(R1 ) RF)
1
seconds
11. Peak detector current IA:
IA +
VREF
20, 000
(VREF
in
volts
and
IA
in
amps)
Note: For derivation/explanation of this equation, please see TAN-011.
Rev. 3.01
9
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