One popular PLL unit is the 565, shown in 13.26ก The 565 contains a phase detector, an
amplifier, and a voltage-controlled oscillator, which are only partially connected internally. An
external resistor and capacitor R1 and C1o respectively, are used to set the free-running or center
frequency of the VCO. Another external capacitor, C2, is used to set the low-pass filter passband,
and the VCO output must be connected back as input to the
phase detector to close the PLL loop. The 565 typically uses two power supplies, v+ and v-.
One popular PLL unit is the 565, shown in 13.26ก The 565 contains a phase detector, an amplifier, and a voltage-controlled oscillator, which are only partially connected internally. An external resistor and capacitor R1 and C1o respectively, are used to set the free-running or center frequency of the VCO. Another external capacitor, C2, is used to set the low-pass filter passband, and the VCO output must be connected back as input to thephase detector to close the PLL loop. The 565 typically uses two power supplies, v+ and v-.
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