1. General Information (About CERALOCK)

️· What is it? CERALOCK is a ceramic resonator. Think of it as a component used in oscillators (circuits that generate periodic signals, like clocks).
️· Positioning: Its frequency stability is between that of crystals (very stable) and LC/RC oscillators (less stable).
️· Temperature Range: Typically operates within -20 to +80°C.
️· Customization: Murata (the manufacturer) can manufacture custom CERALOCKs for specific frequencies.
️· Series Types Mentioned: CSTLS Series (for MHz band, three-terminal).

2. Electrical Specifications

️· Frequency Stability: ±0.3 to ±0.5% (against initial values).
️· Initial Frequency Precision: ±0.5% (standard products).
️· Load Capacitance: Built-in for the CSTLS series.
️· Reversibility: Connecting the terminals in reverse doesn’t significantly affect oscillation, just a slight frequency lag.
️· Resonant Impedance (for CSTLS series):
- 13.40 - 3.99 MHz: 150 Ω max.
- 14.00 - 7.99 MHz: 130 Ω max.
- 18.00 - 10.00 MHz: 125 Ω max.
- 16.00 - 32.99 MHz: 150 Ω max.
- 33.00 - 50.00 MHz: 140 Ω max.

3. Oscillation Circuits

️· Types of Oscillators: CERALOCK is typically used in circuits using positive feedback (most common).
️· LC Circuits: Colpitts and Hartley circuits are frequently used.
️· Basic Configuration: Typically involves a transistor (as an amplifier).
️· How it works: The resonator is used to replace the inductor in the LC network, taking advantage of its inductive behavior between resonant and anti-resonant frequencies.
️· Oscillation Condition: Loop Gain (G) must be greater than or equal to 1, and the phase shift must be a multiple of 360 degrees (e.g., 360°, 720°).
️· Inverter Usage: Colpitts circuits often use an inverter for the transistor.

4. Specifications of CERALOCK (CSTLS Series)

️· Application: CSTLS Series is used in the MHz band.
️· Measuring circuit constants: It is dependent on frequency.
️· Table: Table of Resonant Impedance Specifications is included.

5. Key Takeaways

️· Versatile Oscillator Component: CERALOCKs offer a good balance between frequency stability and cost, making them suitable for a range of applications.
️· Circuit Design Considerations: When designing circuits using CERALOCKs, careful attention needs to be paid to loop gain, phase shift, and measuring circuit constants.
️· Customization is Possible: Murata provides the ability to order custom frequencies if needed.
️· CSTLS Series Focus: The provided information emphasizes the CSTLS series' specifications and application.
️· Temperature Considerations: The temperature range is an important factor when designing with CERALOCKs.