The LM565CH is a Phase-Locked Loop (PLL) integrated circuit manufactured by National Semiconductor (now Texas Instruments). It is designed for general-purpose frequency synthesis, FM demodulation, and various other applications requiring a stable and adjustable frequency source.

Applications

• FM Demodulation
• Frequency Synthesis
• Tone Decoding
• FSK (Frequency-Shift Keying) Demodulation
• Motor Speed Control

Features

• Wide Operating Voltage Range: Operates over a wide range of supply voltages, typically from 5V to 24V, providing flexibility in various applications.
• Adjustable Center Frequency: The center frequency can be adjusted using external components, allowing for precise frequency control.
• High Stability: Provides a stable and reliable frequency output, ensuring consistent performance.
• Low Drift: Exhibits low frequency drift over temperature, maintaining accuracy in varying environmental conditions.
• Excellent Linearity: Offers excellent linearity in FM demodulation applications, ensuring minimal distortion of the demodulated signal.
• TTL/DTL Compatibility: Compatible with TTL and DTL logic levels, simplifying integration into digital systems.

Benefits

• Versatile Frequency Source: Can be used in a variety of applications requiring a stable and adjustable frequency source.
• Precise Frequency Control: Adjustable center frequency allows for precise frequency control, meeting specific application requirements.
• Reliable Performance: High stability and low drift ensure consistent and reliable performance over time and temperature.
• Minimal Distortion: Excellent linearity in FM demodulation applications ensures minimal distortion of the demodulated signal.
• Easy Integration: TTL/DTL compatibility simplifies integration into digital systems.

Additional Details

The LM565CH typically comes in an 8-pin DIP (Dual Inline Package). The center frequency, lock range, and capture range can be adjusted using external resistors and capacitors. It's essential to refer to the Texas Instruments (formerly National Semiconductor) datasheet for detailed specifications, application notes, and recommended operating conditions to ensure optimal performance and reliability. Proper decoupling and grounding are crucial for minimizing noise and ensuring stable operation. The free-running frequency is determined by an external resistor and capacitor.