CDCE949 Programmable 4-PLL VCXO Clock Synthesizer with 2.5V or 3.3V LVCMOS Outputs | TI.com

CDCE949 (ACTIVE)

Programmable 4-PLL VCXO Clock Synthesizer with 2.5V or 3.3V LVCMOS Outputs

Programmable 4-PLL VCXO Clock Synthesizer with 2.5V or 3.3V LVCMOS Outputs - CDCE949
 

Special note

Pre-programming of customer-specific settings is available. Contact your local Texas Instruments sales representative or local authorized distributor for more information.

Description

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 CDCEx949 has separate output supply pins, VDDOUT, 1.8 V for the CDCEL949, and 2.5 V to 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 to 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.

The deep M/N divider ratio allows the generation of zero-ppm audio or video, networking (WLAN, BlueTooth™, Ethernet, GPS) or Interface (USB, IEEE1394, Memory Stick) clocks from a reference input frequency, such as 27 MHz.

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. 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 and 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 CDCEx949 operates in a 1.8-V environment. It operates within a temperature range of –40°C to 85°C.

Features

  • Member of Programmable Clock Generator Family
    • CDCEx913: 1 PLLs, 3 Outputs
    • CDCEx925: 2 PLLs, 5 Outputs
    • CDCEx937: 3 PLLs, 7 Outputs
    • CDCEx949: 4 PLLs, 9 Outputs
  • In-System Programmability and EEPROM
    • Serial Programmable Volatile Register
    • Nonvolatile EEPROM to Store Customer Settings
  • Flexible Input Clocking Concept
    • External Crystal: 8 to 32 MHz
    • On-Chip VCXO: Pull-Range ±150 ppm
    • Single-Ended LVCMOS Up to 160 MHz
  • Free Selectable Output Frequency Up to 230 MHz
  • Low-Noise PLL Core
    • PLL Loop Filter Components Integrated
    • Low Period Jitter (Typical 60 ps)
  • Separate Output Supply Pins
    • CDCE949: 3.3 V and 2.5 V
    • CDCEL949: 1.8 V
  • Flexible Clock Driver
    • Three User-Definable Control Inputs [S0/S1/S2], for Example, SSC Selection, Frequency Switching, Output Enable or Power Down
    • Generates Highly Accurate Clocks for Video, Audio, USB, IEEE1394, RFID, Bluetooth®, WLAN, Ethernet™, and GPS
    • Generates Common Clock Frequencies Used With TI-DaVinci™, OMAP™, DSPs
    • Programmable SSC Modulation
    • Enables 0-PPM Clock Generation
  • 1.8-V Device Core Supply
  • Wide Temperature Range: –40°C to 85°C
  • Packaged in TSSOP
  • Development and Programming Kit for Easy PLL Design and Programming (TI Pro-Clock™)

View more

Parametrics Compare all products in Spread-Spectrum Clocks

 
Input Level
Output Level
Features
Rating
Pin/Package
Operating Temperature Range (C)
Approx. Price (US$)
Divider Ratio
Function
Jitter-Peak to Peak(P-P) or Cycle to Cycle(C-C)
Number of Outputs
Output Frequency (Max) (MHz)
Output Frequency (Min) (MHz)
Output Skew (ps)
Programmability
CDCE949 CDCE913 CDCE925 CDCE937 CDCEL824 CDCEL913 CDCEL925 CDCEL937 CDCEL949
Crystal
LVCMOS    
Crystal
LVCMOS    
Crystal
LVCMOS    
Crystal
LVCMOS    
Crystal
LVCMOS    
Crystal
LVCMOS    
Crystal
LVCMOS    
Crystal
LVCMOS    
Crystal    
LVCMOS     LVCMOS     LVCMOS     LVCMOS     LVCMOS     LVCMOS     LVCMOS     LVCMOS     LVCMOS    
Integrated EEPROM
Multiplier/Divider
Spread Spectrum Clocking (SSC)    
I2C
Integrated EEPROM
Pin Programming
Spread Spectrum Clocking (SSC)    
Integrated EEPROM
Multiplier/Divider
Spread Spectrum Clocking (SSC)    
Integrated EEPROM
Multiplier/Divider
Spread Spectrum Clocking (SSC)    
Integrated EEPROM
Spread Spectrum Clocking (SSC)    
Integrated EEPROM
Multiplier/Divider
Spread Spectrum Clocking (SSC)    
Integrated EEPROM
Multiplier/Divider
Spread Spectrum Clocking (SSC)    
Integrated EEPROM
Multiplier/Divider
Spread Spectrum Clocking (SSC)    
Integrated EEPROM
Multiplier/Divider
Spread Spectrum Clocking (SSC)    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog    
24TSSOP     14TSSOP     16TSSOP     20TSSOP     16TSSOP     14TSSOP     16TSSOP     20TSSOP     24TSSOP    
-40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85    
2.35 | 1ku     1.60 | 1ku     1.93 | 1ku     2.14 | 1ku     1.75 | 1ku     1.60 | 1ku     1.80 | 1ku     2.14 | 1ku     2.35 | 1ku    
Universal     Universal     Universal     Universal       Universal     Universal     Universal     Universal    
Clock Synthesizer     Clock Generator
Spread Spectrum Clock    
Clock Synthesizer     Clock Synthesizer     Clock Generator     Clock Synthesizer     Clock Synthesizer     Clock Synthesizer     Clock Synthesizer    
60 ps     60 ps     60 ps     60 ps     60 ps     60 ps     60 ps     60 ps     60 ps    
9     3     5     7     4     3     5     7     9    
230     230     230     230     201     230     230     230     230    
8     8     8     8     8     8     8     8     8    
150     150     150     150     150     150     150     150     150    
EEPROM     EEPROM     EEPROM     EEPROM     EEPROM     EEPROM     EEPROM     EEPROM     EEPROM    

Other qualified versions of CDCE949

Version Part Number Definition
Automotive CDCE949-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects

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