RC2211
PRODUCT SPECIFICATION
2. Internal Reference Voltage, V (measured at pin 10)
R
Loop Phase Detector Output (Pin 11)
This terminal provides a high impedance output for the loop
phase detector. The PLL loop Þlter is formed by R1 and C1
connected to pin 11 (see Figure 1). With no input signal, or
with no phase error within the PLL, the DC level at pin 11 is
+V
æ
Sö
----------
-650 mV
ø
VR
=
è
2
3. Loop Lowpass Filter Time Constant, t
very nearly equal to V . The peak voltage swing available at
R
the phase detector output is equal to ±V .
R
t = R C
1 1
VCO Control Input (Pin 12)
4. Loop Dampening, z:
VCO free running frequency is determined by external
timing resistor, R0, connected from this terminal to ground.
æ
ç
è
ö
C0
1
4
æ ö
÷
--
z =
------
C
è ø
The VCO free running frequency, F is given by:
0
1ø
1
F0 (Hz) = -------------
R0C0
5. Loop Tracking Bandwidth, ±DF/F :
0
Df/F = R0/R1
O
where C is the timing capacitor across pins 13 and 14. For
0
Tracking
Bandwidth
optimum temperature stability R must be in the range of
10 kW to 100 kW (see Typical Performance Characteristics).
0
Df
Df
This terminal is a low impedance point, and is internally
biased at a DC level equal to V . The maximum timing cur-
R
rent drawn from pin 12 must be limited to £3 mA for proper
operation of the circuit.
F
LL
F
F
F
F
1
0
2
LH
65-2211-03
VCO Timing Capacitor (Pins 13 and 14)
6. FSK Data Filter Time Constant, t :
F
VCO frequency is inversely proportional to the external tim-
ing capacitor, C , connected across these terminals. C must
t = R C
F F F
0
0
be non-polarized, and in the range of 200 pF to 10 mF.
7. Loop Phase Detector Conversion Gain, Kf (Kf is the
differential DC voltage across pins 10 and 11, per unit
of phase error at phase-detector input):
VCO Frequency Adjustment
VCO can be Þne tuned by connecting a potentiometer, Rx, in
series with R at pin 12 (see Figure 2).
0
(Ð2) (VR)
kf (in volts per radian) = ---------------------------
p
VCO Free-Running Frequency, F
0
The RC2211 does not have a separate VCO output terminal.
Instead, the VCO outputs are internally connected to the
phase detector sections of the circuit. However, for set-up or
adjustment purposes, the VCO freerunning frequency can be
8. VCO Conversion Gain, K is the amount of change in
0
VCO frequency per unit of DC voltage change at pin 11:
Ð1
K0 (in Hertz per volt) = ---------------------
C0R1VR
measured at pin 3 (with C disconnected) with no input and
D
with pin 2 shorted to pin 10.
9. Total Loop Gain, K :
T
Design Equations
K (in radians per second per volt)= 2 pKfK0
T
See Figure 1 for DeÞnitions of Components.
4
=
-------------
C 0 R 1
1. VCO Center Frequency, F :
0
1
F 0 (Hz) = -------------
R0C0
10. Peak Phase Detector Current, I :
A
VR
I
A (mA) = -------
25
3
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