LM565 is a general purpose PLL (Phase Locked Loop) IC designed for demodulation, frequency multiplication and frequency division. The device mainly consists of two components, one is voltage controller oscillator and other is phase detector. In which VCO is designed for highly linear operation and PD with good carrier suppression.
Pin Configuration
LM565 is a 14 pin device and the function of each pin is stated below.
| Pin | Name | Function |
| 1 | -Vcc | Negative power supply input pin |
| 2 | Input | Phase detector input pin (FM signal input) |
| 3 | Input | Phase detector input pin (FM signal input) |
| 4 | VCO output | VCO (Voltage Control Oscillator) output seen at this pin |
| 5 | Phase comparator VCO input | Phase detector input pin (VCO output is feedback through this pin) |
| 6 | Reference output | Internal amplifier reference output |
| 7 | VCO control voltage | VCO control voltage can be seen at this pin |
| 8 | Timing Resistor | Resistor to free running frequency of VCO |
| 9 | Timing Capacitor | Capacitor for free running frequency of VCO |
| 10 | +Vcc | Positive power supply |
| 11 | NC | No connection |
| 12 | NC | No connection |
| 13 | NC | No connection |
| 14 | NC | No connection |
