XR-2211A Datasheet, PDF (9/24 Pages) Exar Corporation – FSK Demodulator/ Tone Decoder

XR-2211A
6. FSK Data filter time constant, tF:
t_F +
(
R_B
R_B
· R_F
) R_F)
·C_F
(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 K_d
+
V_REF · 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
V_REF ·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. K_T:
ǒ Ǔƪ ƫ K_T + K_O·K_d·F(s) +
R_F
5, 000·C₀·(R₁ ) R_F)
1
seconds
11. Peak detector current I_A:
I_A +
V_REF
20, 000
(V_REF
in
volts
and
I_A
in
amps)
Note: For derivation/explanation of this equation, please see TAN-011.
Rev. 1.01
9