CDCEL937 Programmable 3-PLL VCXO Clock Synthesizer with 1.8-V LVCMOS Outputs | TI.com

CDCEL937 (ACTIVE) Programmable 3-PLL VCXO Clock Synthesizer with 1.8-V LVCMOS Outputs

 

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 CDCE937 and CDCEL937 devices are modular PLL-based low cost, high-performance, programmable clock synthesizers, multipliers and dividers. They generate up to 7 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 three independent configurable PLLs.

The CDCEx937 has separate output supply pins, VDDOUT, which is 1.8 V for CDCEL937 and to 2.5 V to 3.3 V for CDCE937.

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 which allows synchronization of the output frequency to an external control signal, that is, PWM signal.

Features

  • Member of Programmable Clock Generator Family
    • CDCEx913: 1-PLL, 3 Outputs
    • CDCEx925: 2-PLL, 5 Outputs
    • CDCEx937: 3-PLL, 7 Outputs
    • CDCEx949: 4-PLL, 9 Outputs
  • In-System Programmability and EEPROM
    • Serial Programmable Volatile Register
    • Nonvolatile EEPROM to Store Customer Setting
  • Flexible Input Clocking Concept
    • External Crystal: 8 MHz 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
    • CDCE937: 3.3 V and 2.5 V
    • CDCEL937: 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 Power 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™)
  • APPLICATIONS
    • D-TVs, STBs, IP-STBs, DVD Players, DVD Recorders, and Printers

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Parametrics

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Part number Order Input type Number of outputs Output frequency (Max) (MHz) Programmability Operating temperature range (C) Output type Features VCC out (V) VCC core (V)
CDCEL937 Order now Crystal
LVCMOS    
7     230     EEPROM     -40 to 85     LVCMOS     Integrated EEPROM
Multiplier/Divider
Spread Spectrum Clocking (SSC)    
1.8     1.8    
CDCE913 Order now Crystal
LVCMOS    
3     230     EEPROM     -40 to 85     LVCMOS     I2C
Integrated EEPROM
Pin Programming
Spread Spectrum Clocking (SSC)    
2.5
3.3    
1.8    
CDCE925 Order now Crystal
LVCMOS    
5     230     EEPROM     -40 to 85     LVCMOS     Integrated EEPROM
Multiplier/Divider
Spread Spectrum Clocking (SSC)    
3.3
2.5    
1.8    
CDCE937 Order now Crystal
LVCMOS    
7     230     EEPROM     -40 to 85     LVCMOS     Integrated EEPROM
Multiplier/Divider
Spread Spectrum Clocking (SSC)    
2.5
3.3    
1.8    
CDCE949 Order now Crystal
LVCMOS    
9     230     EEPROM     -40 to 85     LVCMOS     Integrated EEPROM
Multiplier/Divider
Spread Spectrum Clocking (SSC)    
2.5
3.3    
1.8    
CDCEL824 Order now Crystal
LVCMOS    
4     201     EEPROM     -40 to 85     LVCMOS     Integrated EEPROM
Spread Spectrum Clocking (SSC)    
1.8     1.8    
CDCEL913 Order now Crystal
LVCMOS    
3     230     EEPROM     -40 to 85     LVCMOS     Integrated EEPROM
Multiplier/Divider
Spread Spectrum Clocking (SSC)    
1.8     1.8    
CDCEL925 Order now Crystal
LVCMOS    
5     230     EEPROM     -40 to 85     LVCMOS     Integrated EEPROM
Multiplier/Divider
Spread Spectrum Clocking (SSC)    
1.8     1.8    
CDCEL949 Order now Crystal     9     230     EEPROM     -40 to 85     LVCMOS     Integrated EEPROM
Multiplier/Divider
Spread Spectrum Clocking (SSC)    
1.8     1.8