XR2211 Exar Corporation, XR2211 Datasheet - Page 9

• Manufacturer Part Number: XR2211
• Description: FSK Demodulator/ Tone Decoder
• Manufacturer: Exar Corporation

6. FSK Data filter time constant, tF:
7. Loop phase detector conversion gain, Kd: (Kd is the differential DC voltage across pin 10 and pin11, per unit of
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):
9. The filter transfer function:
10. Total loop gain. K
11. Peak detector current I
Note: For derivation/explanation of this equation, please see TAN-011.
I
A
phase error at phase detector input):
Rev. 3.01
K
20, 000
K
K
F ( s )
V
T
F
d
0
REF
K
( R
V
10, 000·
V
O
· K
( V
R
REF
1
REF
B
B
d
REF
– 2
· F ( s )
· C
· R
· R
T
:
SR
1
0
in volts and I
R
F
1
· R
F
1
)
· C
radian
A
1
· C
:
volt
1
5, 000· C
F
at 0 Hz .
( seconds )
radian second
A
0
R
·( R
in amps )
volt
F
1
R
S = J and
F
)
seconds
1
9
= 0
XR-2211