CDCE949PW - Programmable 4-PLL VCXO Clock Synthesizer

The CDCE949 and CDCEL949 are modular PLL-based low cost, high-performance, programmable clock synthesizers, multipliers and dividers. They generate up to 9 output clocks from a single input frequency. Each output can be programmed in-system for any clock frequency up to 230 MHz, using up to four independent configurable PLLs.

The CDCx949 has separate output supply pins, VDDOUT, 1.8 V for the CDCEL949, and 2.5...3.3 V for CDCE949. The input accepts an external crystal or LVCMOS clock signal. If an external crystal is used, an on-chip load capacitor is adequate for most applications. The value of the load capacitor is programmable from 0...20 pF. Additionally, an on-chip VCXO is selectable, allowing synchronization of the output frequency to an external control signal, that is, a PWM signal.

Key Features

Member of programmable clock generator family
- CDCE913/CDCEL913: 1 PLLs, 3 outputs
- CDCE925/CDCEL925: 2 PLLs, 5 outputs
- CDCE937/CDCEL937: 3 PLLs, 7 outputs
- CDCE949/CDCEL949: 4 PLLs, 9 outputs
In-system programmability and EEPROM
- Serial programmable volatile register
- Non-volatile EEPROM to store customer settings
Highly flexible clock driver
- Three user-definable control inputs [S0/S1/S2] e.g. SSC-selection, frequency switching, output enable or power down
- Generates highly-accurate clocks for video, audio, USB, IEEE1394, RFID, generates common clock frequencies used with TI DaVinci™, OMAP™, DSPs
- BlueTooth™, WLAN, Ethernet and GPS
- Programmable SSC modulation
- Enables 0-PPM clock generation
Selectable output frequency up to 230 MHz
Flexible input clocking concept
- External crystal: 8...32 MHz
- On-chip VCXO: Pull-range ±150 ppm
- Single-ended LVCMOS up to 160 MHz
Low-Noise PLL core