CDCE937 Programmable 3-PLL VCXO Clock Synthesizer with 2.5-V or 3.3-V LVCMOS Outputs | TI.com

CDCE937
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Programmable 3-PLL VCXO Clock Synthesizer with 2.5-V or 3.3-V LVCMOS Outputs

 

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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Design with CDCE937

Recommend Input Frequency Output Frequencies
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Input Frequency  MHz
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Parametrics

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Part number Order Function Number of outputs Output frequency (Max) (MHz) VCC core (V) VCC out (V) Input type Output type Operating temperature range (C) Package size: mm2:W x L (PKG) Features Package Group Rating
CDCE937 Order now Clock synthesizer     7     230     1.8     2.5
3.3    
Crystal
LVCMOS    
LVCMOS     -40 to 85     20TSSOP: 42 mm2: 6.4 x 6.5 (TSSOP | 20)     Integrated EEPROM
Multiplier or divider
Spread-spectrum clocking (SSC)    
TSSOP | 20     Catalog    
CDCE913 Order now Clock generator
Spread-spectrum clock    
3     230     1.8     2.5
3.3    
Crystal
LVCMOS    
LVCMOS     -40 to 85     14TSSOP: 32 mm2: 6.4 x 5 (TSSOP | 14)     I2C
Integrated EEPROM
Pin programmable
Spread-spectrum clocking (SSC)    
TSSOP | 14     Catalog    
CDCE925 Order now Clock synthesizer     5     230     1.8     3.3
2.5    
Crystal
LVCMOS    
LVCMOS     -40 to 85     16TSSOP: 22 mm2: 4.4 x 5 (TSSOP | 16)     Integrated EEPROM
Multiplier or divider
Spread-spectrum clocking (SSC)    
TSSOP | 16     Catalog    
CDCE949 Order now Clock synthesizer     9     230     1.8     2.5
3.3    
Crystal
LVCMOS    
LVCMOS     -40 to 85     24TSSOP: 34 mm2: 4.4 x 7.8 (TSSOP | 24)     Integrated EEPROM
Multiplier or divider
Spread-spectrum clocking (SSC)    
TSSOP | 24     Catalog    
CDCEL824 Order now Clock generator     4     201     1.8     1.8     Crystal
LVCMOS    
LVCMOS     -40 to 85     16TSSOP: 22 mm2: 4.4 x 5 (TSSOP | 16)     Integrated EEPROM
Spread-spectrum clocking (SSC)    
TSSOP | 16     Catalog    
CDCEL913 Order now Clock synthesizer     3     230     1.8     1.8     Crystal
LVCMOS    
LVCMOS     -40 to 85     14TSSOP: 32 mm2: 6.4 x 5 (TSSOP | 14)     Integrated EEPROM
Multiplier or divider
Spread-spectrum clocking (SSC)    
TSSOP | 14     Catalog    
CDCEL925 Order now Clock synthesizer     5     230     1.8     1.8     Crystal
LVCMOS    
LVCMOS     -40 to 85     16TSSOP: 22 mm2: 4.4 x 5 (TSSOP | 16)     Integrated EEPROM
Multiplier or divider
Spread-spectrum clocking (SSC)    
TSSOP | 16     Catalog    
CDCEL937 Order now Clock synthesizer