CDCEL824 CDCEL824 Programmable 2 PLL Clock Synthesizer with Spread Spectrum Capability | TI.com

CDCEL824 (ACTIVE)

CDCEL824 Programmable 2 PLL Clock Synthesizer with Spread Spectrum Capability

 

Recommended alternative parts

  • CDCEL925  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   Footprint compatible Clock generator with 5 outputs

Description

The CDCEL824 is a modular PLL-based low-cost, high-performance, programmable clock synthesizer, multiplier, and divider. It generates up to four output clocks from a single input frequency. Each output can be programmed in-system for any clock frequency up to 201 MHz, using up to two independent configurable PLLs.

The CDCEL824 has a separate output supply pins, VDDOUT, which are 1.8 V.

The input accepts an external crystal or LVCMOS clock signal. In case of a crystal input, an on-chip load capacitor is adequate for most applications. The value of the load capacitor is programmable from 0 pF to 20 pF.

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 27-MHz reference input frequency, for example.

Based on the PLL frequency and the divider settings, the internal loop filter components are automatically adjusted to achieve high stability and optimized jitter transfer characteristic of each PLL.

The device supports nonvolatile EEPROM programming for easy customization of the device in the application. It is preset to a factory default configuration and can be reprogrammed to a different application configuration before it goes onto the PCB or reprogrammed by in-system programming. All device settings are programmable through the SDA/SCL bus, a 2-wire serial interface.

Three free programmable control inputs, S0, S1, and S2, can be used to select different frequencies, or other control features like outputs disable to low, outputs in high-impedance state, power down, PLL bypass, and so forth.

The CDCx824 operates in a 1.8-V environment in a temperature range of –40°C to 85°C.

Features

  • Flexible Clock Driver
    • Three User-Definable Control Inputs
      [S0/S1/S2]: for example, Frequency Switching,
      Output Enable, or Power Down
    • Enables 0-PPM Clock Generation
  • In-System Programmability and EEPROM
    • Serial Programmable Volatile Register
    • Nonvolatile EEPROM to Store Customer
      Settings
  • Flexible Input Clocking Concept
    • External Crystal: 20 MHz to 30 MHz
    • Single-Ended LVCMOS up to 130 MHz
  • Selectable Output Frequency up to 201 MHz
  • Low-Noise PLL Core
    • PLL Loop Filter Components Integrated
    • Low Period Jitter (Typical 80 ps)
  • 1.8-V Device Power Supply
  • Temperature Range –40°C to 85°C
  • Packaged in TSSOP

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Parametrics Compare all products in Spread-spectrum clocks

 
Input level
Output level
Features
Rating
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
CDCEL824 CDCE925 CDCE937 CDCE949 CDCEL913 CDCEL925 CDCEL937 CDCEL949
Crystal
LVCMOS    
Crystal
LVCMOS    
Crystal
LVCMOS    
Crystal
LVCMOS    
Crystal
LVCMOS    
Crystal
LVCMOS    
Crystal
LVCMOS    
Crystal    
LVCMOS     LVCMOS     LVCMOS     LVCMOS     LVCMOS     LVCMOS     LVCMOS     LVCMOS    
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)    
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    
-40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85    
1.75 | 1ku     1.93 | 1ku     2.14 | 1ku     2.35 | 1ku     1.60 | 1ku     1.80 | 1ku     2.14 | 1ku     2.35 | 1ku    
  Universal     Universal     Universal     Universal     Universal     Universal     Universal    
Clock Generator     Clock Synthesizer     Clock Synthesizer     Clock Synthesizer     Clock Synthesizer     Clock Synthesizer     Clock Synthesizer     Clock Synthesizer    
60 ps     60 ps     60 ps     60 ps     60 ps     60 ps     60 ps     60 ps    
4     5     7     9     3     5     7     9    
201     230     230     230     230     230     230     230    
8     8     8     8     8     8     8     8    
150     150     150     150     150     150     150     150    
EEPROM     EEPROM     EEPROM     EEPROM     EEPROM     EEPROM     EEPROM     EEPROM