Chapter: Linear Integrated Circuits : Analog Multiplier and PLL

Monolithic Phase Locked Loops (PLL IC 565)

Operating frequency range: 0.001Hz to 500 Khz. Operating voltage range: ±6 to ±12v.

Monolithic Phase Locked Loops (PLL IC 565):

The important electrical characteristics of the 565 PLL are,

· Operating frequency range: 0.001Hz to 500 Khz.

· Operating voltage range: ±6 to ±12v

· Input level required for tracking: 10mv rms min to 3 Vpp max

· Input impedance: 10 K ohms typically.

· Output sink current: 1mA

· Output source current: 10 Ma

The center frequency of the PLL is determined by the free running frequency of the VCO, which is given by

f_OUT = 1.2/ 4R₁C₁

where R₁&C₁ are an external resistor & a capacitor connected to pins 8 & 9.

· The VCO free-running frequency fOUT is adjusted externally with R1 & C1 to be at the center of the input frequency range.

· C₁ can be any value; R₁ must have a value between 2 k ohms and 20 K ohms.

· Capacitor C₂ connected between 7 & +V.

· The filter capacitor C₂ should be large enough to eliminate variations in the demodulated output voltage in order to stabilize the VCO frequency.

The lock range f_L & capture range fc of PLL is given by,

∆f_L= ±7.8 fout/ V Hz

Where f_OUT = free running frequency of VCO (Hz)

V = (+Vcc)-(-Vcc) volts

∆f_C= ±[ ∆fL/(2Π)(3.6)(10³)C₂ ]½

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Linear Integrated Circuits : Analog Multiplier and PLL : Monolithic Phase Locked Loops (PLL IC 565) |