Overview
The CDCE949PWR, produced by Texas Instruments, is a programmable 4-PLL VCXO clock synthesizer. It is part of the CDCEx9xx family of modular PLL-based, low-cost, high-performance clock synthesizers, multipliers, and dividers. This device can generate up to nine output clocks from a single input frequency, with each output programmable in-system for any clock frequency up to 230MHz using up to four independent configurable PLLs. The CDCE949PWR operates within a wide temperature range of –40°C to 85°C and is packaged in a 24-pin TSSOP (PW) package.
Key Specifications
| Parameter | Value |
|---|---|
| Package | TSSOP (PW) with 24 pins |
| Operating Temperature Range | –40°C to 85°C |
| Input Clock Frequency | 8MHz to 32MHz (external crystal), LVCMOS clock signal |
| Output Frequency Range | Up to 230MHz |
| Output Supply Voltage | 2.5V or 3.3V (CDCE949), 1.8V (CDCEL949) |
| PLLs | 4 independent configurable PLLs |
| Output Type | Single-ended LVCMOS up to 160MHz |
| Period Jitter | 60ps (typical) |
| VCXO Pull-Range | ±150ppm |
| Programming Interface | 2-wire serial interface (SDA and SCL bus) |
| Control Inputs | Three user-definable control inputs (S0, S1, S2) |
Key Features
- In-System programmability and non-volatile EEPROM to store customer settings
- Flexible input clocking concept with external crystal or LVCMOS clock signal
- On-chip VCXO with ±150ppm pull-range for synchronization to external control signals
- Low-noise PLL core with integrated PLL loop filter components
- Low period jitter of 60ps (typical)
- Separate output supply pins with 2.5V or 3.3V for CDCE949 and 1.8V for CDCEL949
- Flexible clock driver with three user-definable control inputs (S0, S1, S2)
- Programmable SSC modulation for reducing EMI
- Enables 0ppm clock generation for precise timing
- Development and programming kit available (TI Pro-Clock™)
Applications
- Digital TVs (D-TVs)
- Set-Top Boxes (STBs) and IP-STBs
- DVD players and DVD recorders
- Printers
- Video, audio, USB, IEEE1394, RFID, Bluetooth, WLAN, Ethernet, and GPS systems
- TI-DaVinci™, OMAP™, and DSPs
Q & A
- What is the CDCE949PWR?
The CDCE949PWR is a programmable 4-PLL VCXO clock synthesizer produced by Texas Instruments.
- What is the operating temperature range of the CDCE949PWR?
The operating temperature range is –40°C to 85°C.
- What are the possible output frequencies of the CDCE949PWR?
The output frequencies can be programmed up to 230MHz.
- What types of input clocks can the CDCE949PWR accept?
The device can accept an external crystal or an LVCMOS clock signal.
- What is the purpose of the on-chip VCXO?
The on-chip VCXO allows synchronization of the output frequency to an external control signal, such as a PWM signal.
- How many PLLs does the CDCE949PWR have?
The device has four independent configurable PLLs.
- What is the typical period jitter of the CDCE949PWR?
The typical period jitter is 60ps.
- What programming interface does the CDCE949PWR use?
The device uses a 2-wire serial interface (SDA and SCL bus) for programming.
- What are the applications of the CDCE949PWR?
The device is used in various applications including D-TVs, STBs, DVD players, printers, and systems requiring precise clock frequencies such as video, audio, USB, IEEE1394, RFID, Bluetooth, WLAN, Ethernet, and GPS.
- Is the CDCE949PWR compatible with other Texas Instruments products?
Yes, it generates common clock frequencies used with TI-DaVinci™, OMAP™, and DSPs.
