CDCE949是TI公司的一款扩频时钟产品，CDCE949是Clock Generator，本页介绍了CDCE949的产品说明、应用、特性等，并给出了与CDCE949相关的TI元器件型号供参考。
CDCE949 - Clock Generator - 扩频时钟 - 时钟发生器 - TI公司（Texas Instruments，德州仪器）
The CDCE949 and CDCEL949 are modular PLL-based low cost, high-performance, programmable clock synthesizers, multipliers and dividers. They generate up to 9output clocks from a single input frequency. Each output can be programmed in-system for any clock frequency up to 230MHz, using up to four independent configurable PLLs.
The CDCx949 has separate output supply pins, VDDOUT, 1.8 V for the CDCEL949, and 2.5V to 3.3V 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 to 20pF. Additionally, an on-chip VCXO is selectable, allowing synchronization of the output frequency to an external control signal, that is, a PWM signal.
The deep M/N divider ratio allows the generation of zero-ppm audio/video, networking (WLAN, BlueTooth™, Ethernet, GPS) or Interface (USB, IEEE1394, Memory Stick) clocks from a reference input frequency, such as 27MHz.
All PLLs support SSC (Spread-Spectrum Clocking). SSC can be Center-Spread or Down-Spread clocking. This is a common technique to reduce electro-magnetic interference (EMI).
Based on the PLL frequency and the divider settings, the internal loop-filter components are automatically adjusted to achieve high stability, and to optimize the jitter-transfer characteristics of each PLL.
The device supports non-volatile EEPROM programming for easy customization of the device to the application. It is preset to a factory-default configuration (see the Default Device Configuration section). It can be reprogrammed to a different application configuration before PCB assembly, or reprogrammed by in-system programming. All device settings are programmable through the SDA/SCL bus, a 2-wire serial interface.
Three programmable control inputs, S0, S1 and S2, can be used to control various aspects of operation including frequency selection, changing the SSC parameters to lower EMI, PLL bypass, power down, and choosing between low level or 3-state for the output-disable function.
The CDCx949 operates in a 1.8V environment. It operates within a temprateure range of –40°C to 85°C.
- 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 230MHz
- Flexible Input Clocking Concept
- External Crystal: 8 to 32 MHz
- On-Chip VCXO: Pull-Range ±150 ppm
- Single-Ended LVCMOS up to 160MHz
- Low-Noise PLL Core
- Integrated PLL Loop Filter Components
- Very Low Period Jitter (typ 60 ps)
- Separate Output Supply Pins
- CDCE949: 3.3 V and 2.5 V
- CDCEL949: 1.8 V
- 1.8 V Device Power Supply
- Wide Temperature Range –40°C to 85°C
- Packaged in TSSOP
- Development and Programming Kit for Ease PLL Design and Programming (TI-Pro Clock)
- APPLICATIONS
- D-TV, HD-TV, STB, IP-STB, DVD-Player, DVD-Recorder, Printer
- General Purpose Frequency Synthesizing
DaVinci, OMAP, Pro Clock are trademarks of Texas Instruments. BlueTooth is a trademark of Bluetooth SIG, Inc. I2C is a trademark of Philips Electronics.
