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| XR-2211A Datasheet, PDF (8/24 Pages) Exar Corporation – FSK Demodulator/ Tone Decoder | |||
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XR-2211A
DESIGN EQUATIONS
(All resistance in W, all frequency in Hz and all capacitance in farads, unless otherwise specified)
(See Figure 3. for definition of components)
1. VCO Center Frequency, fO:
fO
+
1
R0·C0
2. Internal Reference Voltage, VREF (measured at pin 10):
Ç Ç VREF +
VCC
2
â650mV in volts
3. Loop Low-Pass Filter Time Constant, t:
t + C1·RPP (seconds)
where:
Ç Ç RPP +
R1·RF
R1 ) RF
if RF is 1 or CF reactance is 1, then RPP = R1
4. Loop Damping, j:
Ç¸Ç Ç z +
1250·C0
R1·C1
Note: For derivation/explanation of this equation, please see TAN-011.
5. Loop-tracking
bandwidth,
"+
Df
f0
Df
f0
+
R0
R1
Tracking
Bandwidth
Df
Df
fLL
f1
fO
f2
fLH
Rev. 1.01
8
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