XR-2212_06 datasheet(10/20 Pages) EXAR

Part #	XR-2212

Description	Precision Phase-Locked Loop

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Manufacturer	EXAR [Exar Corporation]

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XR-2212

10

Rev. 2.10

Design Equations

(See

Figure 3 and Figure 10 for definition of

components.)

1.

VCO Center Frequency, f0: f0 = 1/R0C0 Hz

2.

Internal Reference Voltage, VREF (measured at

Pin 11)

VREF = VCC/2 - 650mV

3.

Loop Low-Pass Filter Time Constant,

t : t = R1C1

4.

Loop Damping,

j:

j + 0.25

NC

0

C

1

where N is the external frequency divider modular

(See 2). If no divider is used, N = 1.

5.

Loop Tracking Bandwidth,

$Df/f0: Df/f0 = R0/R1

6.

Phase Detector Conversion Gain, KO: (KO is the

differential DC voltage across Pins 10 and 11, per unit

of phase error at phase-detector input)

KO = -2VREF/p volts/radian

7.

VCO Conversion Gain, K0: (K0 is the amount of

change in VCO frequency, per unit of DC voltage

change at Pin 10. It is the reciprocal of the slope of

conversion characteristics shown in

Figure 10).

K0 = -1/VREFC0R1 Hz/V

8.

Total Loop Gain, KT

KT = 2pKO K0 = 4/C0R1 rad/sec/volt

9.

Peak Phase-Detector Current, IA; available at Pin 10.

IA = VREF (volts)/25mA

APPLICATION INFORMATION

FM Demodulation

XR-2212 can be used as a linear FM demodulator for both

narrow-band and wide-band FM signals. The generalized

circuit connection for this application is shown in

Figure 11, where the VCO output (Pin 5) is directly

connected to the phase detector input (Pin 16). The

demodulated signal is obtained at phase detector output

(Pin 10). In the circuit connection of Figure 10, the op amp

section of XR-2212 is used as a buffer amplifier to provide

both additional voltage amplification as well as current

drive capability. Thus, the demodulated output signal

available at the op amp output (Pin 8) is fully buffered from

the rest of the circuit.

In the circuit of

Figure 11, R0C0 set the VCO center

frequency, R1 sets the tracking bandwidth, C1 sets the

low-pass filter time constant. Op amp feedback resistors

RF and RC set the voltage gain of the amplifier section.

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