## Overview of the PLL600-27TSC-R The **PLL600-27TSC-R** is a high-performance **VCXO** (Voltage Controlled Crystal Oscillator) IC designed specifically for high-definition video applications, set-top boxes, and ADSL modems. It is manufactured by Microchip Technology (formerly PhaseLink). --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Function** | VCXO (Voltage Controlled Crystal Oscillator) | | **Output Frequency Range** | 1MHz to 27MHz | | **Supply Voltage (VDD)** | 2.25V to 3.63V | | **Output Type** | CMOS | | **Package Type** | SOT-23 (6-pin) | | **Operating Temperature** | 0°C to 70°C (Commercial) | | **Pulling Range** | ±200 ppm (typical) | --- ### 2. Functional Electronic Components The internal architecture of the PLL600-27TSC-R consists of several critical electronic blocks: 1. **Voltage Control Input (VIN):** This pin allows an external analog voltage to adjust the output frequency. It is used for "fine-tuning" the clock to synchronize with an incoming data stream. 2. **Crystal Oscillator Circuit:** Designed to work with a fundamental mode crystal (usually 27MHz) to provide a stable reference frequency. 3. **Phase-Locked Loop (PLL):** The core circuitry that stabilizes the output frequency relative to the crystal and the control voltage. 4. **Output Buffer:** A CMOS driver that ensures the signal integrity of the 27MHz clock as it travels to other components on the PCB. --- ### 3. Pin Configuration | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | **VIN** | Voltage Control Input | | 2 | **GND** | Ground Connection | | 3 | **XIN** | Crystal Input | | 4 | **XOUT** | Crystal Output | | 5 | **VDD** | Power Supply (3.3V typical) | | 6 | **CLKOUT** | CMOS Clock Output | --- ### 4. Application Use Case This part is primarily used in **MPEG video clock regeneration**. In a digital video system, the 27MHz clock must be perfectly synchronized with the broadcast source to prevent frame dropping or audio-video desync. The PLL600-27TSC-R allows the system's software to adjust the clock speed dynamically via the **VIN** pin. --- ### 5. Part Number Breakdown: `PLL600-27TSC-R` * **PLL600-27**: Base series (27MHz optimized). * **T**: Package Code (SOT-23). * **S**: Speed/Feature variation. * **C**: Commercial Temperature Range. * **-R**: Tape and Reel packaging.