## Overview of K1525CDC-R The **K1525CDC-R** is a high-precision, high-stability **Oven Controlled Crystal Oscillator (OCXO)**. It is primarily used in telecommunications and networking equipment where precise timing and frequency stability are critical. The "R" suffix typically denotes compliance with RoHS (Restriction of Hazardous Substances) standards. --- ### Core Specifications The following table summarizes the primary electrical characteristics of the K1525CDC-R: | Feature | Specification | | :--- | :--- | | **Component Type** | OCXO (Oven Controlled Crystal Oscillator) | | **Nominal Frequency** | Typically 10.0 MHz to 20.0 MHz (depends on specific variant) | | **Output Type** | CMOS / HCMOS | | **Supply Voltage (Vcc)** | +5.0 VDC (±5%) | | **Frequency Stability** | ±0.05 ppm to ±0.1 ppm (Over temp range) | | **Operating Temperature** | 0°C to +70°C (Standard commercial range) | | **Package Style** | Through-hole (DIP-14 compatible footprint) | --- ### Key Internal Electronic Parts The K1525CDC-R is not a simple crystal; it is an integrated module consisting of several sub-components: 1. **Quartz Crystal Resonator:** The heart of the device, cut specifically for high stability. 2. **Heating Element (Oven):** A resistive heater that maintains the crystal at a constant "turn-over" temperature (usually around 75°C to 85°C) to negate environmental temperature fluctuations. 3. **Control Circuitry:** Includes a thermistor for temperature sensing and a feedback loop to regulate the heater power. 4. **Voltage Regulator:** Internal regulation to ensure the frequency remains stable even if there are slight ripples in the external power supply. 5. **Buffer Amplifier:** Ensures the output signal (CMOS) can drive the intended load without degrading the frequency stability. --- ### Pin Configuration (Standard DIP-14) | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | Vc (Control Voltage) | Optional pin for frequency tuning/adjustment. | | **7** | Case Ground | Connected to the metal housing for EMI shielding. | | **8** | Output | The generated clock signal (CMOS). | | **14** | Vcc | Positive supply voltage (+5V). | --- ### Usage Considerations * **Warm-up Time:** Because it uses an oven, the device requires a "warm-up" period (usually 2–5 minutes) before it reaches its specified stability. * **Power Consumption:** OCXOs consume more current than standard oscillators (XO) or temperature-compensated oscillators (TCXO) because of the power required to run the internal heater. * **Applications:** Base stations, Stratum 3 clocks, test and measurement instrumentation, and satellite communications.