TI CDCEL824PWR

The CDCEL824 is a modular, low-cost, high-performance programmable clock synthesizer/multiplier/divider based on a Phase-Locked Loop (PLL). This device can generate up to four output clocks from a single input frequency. Up to two independently configurable PLLs can be used within the system to program each output at any clock frequency (up to 201 MHz). The CDCEL824 features an independent output power supply pin VDDOUT with a voltage of 1.8 V. This input accepts an external crystal oscillator or an LVCMOS clock signal. For crystal oscillator inputs, the on-chip load capacitance is sufficient for most applications. The load capacitance value can be set in the range of 0 pF to 20 pF. For example, a deep M/N division ratio can generate zero ppm audio/video, network interconnection (Wireless Local Area Network (WLAN), Bluetooth, Ethernet, Global Positioning System (GPS)) or interface (Universal Serial Bus (USB), IEEE1394, Memory Stick) clocks from a 27 MHz reference input frequency. The device automatically adjusts the internal loop filter components according to the PLL frequency and divider settings, enabling each PLL to have high stability and optimized jitter transfer characteristics. To easily customize the device to meet application requirements, the device supports programming using non-volatile EEPROM. The device is preset with the default factory configuration, allowing it to be reprogrammed according to another application configuration before being installed on a Printed Circuit Board (PCB) or reprogrammed through in-system programming. All device settings can be programmed via the Serial Data/Serial Clock (SDA/SCL) bus, a two-wire serial interface. Three freely programmable control inputs (S0, S1, and S2) can be used to select different frequencies or other control functions, including disabling the output to a low level, outputting in a high-impedance state, powering down, and bypassing the PLL. The CDCx824 can operate at a voltage of 1.8 V, with an operating temperature range of -40°C to 85°C.

• Flexible clock driver
• 3 user-defined control inputs [S0/S1/S2]: e.g., switching frequency, output enable, or power-down
• Enables 0-PPM clock generation
• In-system programmability and EEPROM
• Serially programmable volatile registers and non-volatile EEPROM for storing customer settings
• Flexible input clocking concept
• External crystal: 20MHz to 30MHz
• Single-ended LVCMOS up to 130MHz
• Selectable output frequency up to 201MHz
• Low-noise PLL core
• Integrated PLL loop filter components with low cycle jitter (typical 80ps)
• 1.8V device supply
• Temperature range: -40°C to 85°C

• Laser ranging applications