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CDCF5801

NOT RECOMMENDED FOR NEW DESIGNS

Low-jitter PLL-based multiplier & divider with programmable delay lines down to sub 10 ps

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Data sheet
CDCF5801 is not recommended for new designs
This product continues to be available for existing customers. New designs should consider an alternate product.
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CDCF5801A ACTIVE Low-jitter PLL-based multiplier & divider with programmable delay lines down to sub 10 ps Newer version available

CDCF5801

NOT RECOMMENDED FOR NEW DESIGNS
Data sheet Order now

Product details

Function Clock generator Operating temperature range (°C) -40 to 85 Rating Catalog
Function Clock generator Operating temperature range (°C) -40 to 85 Rating Catalog
SSOP (DBQ) 24 51.9 mm² 8.65 x 6
  • Low-Jitter Clock Multiplier: ×1, ×2, ×4, ×8
  • Programmable Bidirectional Delay Steps of 1.3 mUI
  • Output Frequency Range of 25 MHz to 280 MHz
  • Input Frequency Range of 12.5 MHz to 240 MHz
  • Low Jitter Generation
  • Single-Ended REFCLK Input With Adjustable Trigger Level (Works With LVTTL, HSTL, and LVPECL)
  • Differential/Single-Ended Output
  • Output Can Drive LVPECL, LVDS, and LVTTL
  • Three Power Operating Modes to Minimize Power
  • Low Power Consumption (&kt;190 mW at 280 MHz/3.3 V)
  • Packaged in a Shrink Small-Outline Package (DBQ)
  • No External Components Required for PLL
  • Spread Spectrum Clock Tracking Ability to Reduce EMI (SSC)
  • APPLICATIONS
    • Video Graphics
    • Gaming Products
    • Datacom
    • Telecom
    • Noise Cancellation Created by FPGAs
  • Low-Jitter Clock Multiplier: ×1, ×2, ×4, ×8
  • Programmable Bidirectional Delay Steps of 1.3 mUI
  • Output Frequency Range of 25 MHz to 280 MHz
  • Input Frequency Range of 12.5 MHz to 240 MHz
  • Low Jitter Generation
  • Single-Ended REFCLK Input With Adjustable Trigger Level (Works With LVTTL, HSTL, and LVPECL)
  • Differential/Single-Ended Output
  • Output Can Drive LVPECL, LVDS, and LVTTL
  • Three Power Operating Modes to Minimize Power
  • Low Power Consumption (&kt;190 mW at 280 MHz/3.3 V)
  • Packaged in a Shrink Small-Outline Package (DBQ)
  • No External Components Required for PLL
  • Spread Spectrum Clock Tracking Ability to Reduce EMI (SSC)
  • APPLICATIONS
    • Video Graphics
    • Gaming Products
    • Datacom
    • Telecom
    • Noise Cancellation Created by FPGAs

The CDCF5801 provides clock multiplication from a reference clock (REFCLK) signal with the unique capability to delay or advance the CLKOUT/CLKOUTB with steps of only 1.3 mUI through a phase aligner. For every rising edge on the DLYCTRL pin the CLKOUT is delayed by a 1.3-mUI step size as long as the LEADLAG input detects a low signal at the time of the DLYCTRL rising edge. Similarly for every rising edge on the DLYCTRL pin the CLKOUT is advanced by a 1.3-mUI step size as long as the LEADLAG pin is high during the transition. This unique capability allows the device to phase align (zero delay) between CLKOUT/CLKOUTB and any one other CLK in the system by feeding the clocks that need to be aligned to the DLYCTRL and the LEADLAG pins. Also it provides the capability to program a fixed delay by providing the proper number of edges on the DLYCTRL pin, while strapping the LEADLAG pin to dc high or low. Further possible applications are:

  • Aligning the rising edge of the output clock signal to the input clock rising edge
  • Avoiding PLL instability in applications that require very long PLL feedback lines
  • Isolation of jitter and digital switching noise
  • Limitation of jitter in systems with good ppm frequency stability

The CDCF5801 provides clock multiplication and division from a reference clock (REFCLK) signal. The device is optimized to have extremely low jitter impact from input to output. The predivider pins MULT[0:1] and post-divider pins P[0:2] provide selection for frequency multiplication and division ratios, generating CLKOUT/CLOUTKB frequencies ranging from 25 MHz to 280 MHz with clock input references (REFCLK) ranging from 12.5 MHz to 240 MHz. The selection of pins MULT[0:1] and P[1:2] determines the multiplication value of 1, 2, 4, or 8. The CDCF5801 offers several power-down/ high-impedance modes, selectable by pins P0, STOPB and PWRDN. Another unique capability of the CDCF5801 is the high sensitivity and wide common-mode range of the clock-input pin REFCLK by varying the voltage on the VDDREF pin. The clock signal outputs CLKOUT and CLKOUTB can be used independently to generate single-ended clock signals. The CLKOUT/CLKOUTB outputs can also be combined to generate a differential output signal suitable for LVDS, LVPECL, or HSTL/SSTL signaling. The CDCF5801 is characterized for operation over free-air temperatures of -40°C to 85°C.

The CDCF5801 provides clock multiplication from a reference clock (REFCLK) signal with the unique capability to delay or advance the CLKOUT/CLKOUTB with steps of only 1.3 mUI through a phase aligner. For every rising edge on the DLYCTRL pin the CLKOUT is delayed by a 1.3-mUI step size as long as the LEADLAG input detects a low signal at the time of the DLYCTRL rising edge. Similarly for every rising edge on the DLYCTRL pin the CLKOUT is advanced by a 1.3-mUI step size as long as the LEADLAG pin is high during the transition. This unique capability allows the device to phase align (zero delay) between CLKOUT/CLKOUTB and any one other CLK in the system by feeding the clocks that need to be aligned to the DLYCTRL and the LEADLAG pins. Also it provides the capability to program a fixed delay by providing the proper number of edges on the DLYCTRL pin, while strapping the LEADLAG pin to dc high or low. Further possible applications are:

  • Aligning the rising edge of the output clock signal to the input clock rising edge
  • Avoiding PLL instability in applications that require very long PLL feedback lines
  • Isolation of jitter and digital switching noise
  • Limitation of jitter in systems with good ppm frequency stability

The CDCF5801 provides clock multiplication and division from a reference clock (REFCLK) signal. The device is optimized to have extremely low jitter impact from input to output. The predivider pins MULT[0:1] and post-divider pins P[0:2] provide selection for frequency multiplication and division ratios, generating CLKOUT/CLOUTKB frequencies ranging from 25 MHz to 280 MHz with clock input references (REFCLK) ranging from 12.5 MHz to 240 MHz. The selection of pins MULT[0:1] and P[1:2] determines the multiplication value of 1, 2, 4, or 8. The CDCF5801 offers several power-down/ high-impedance modes, selectable by pins P0, STOPB and PWRDN. Another unique capability of the CDCF5801 is the high sensitivity and wide common-mode range of the clock-input pin REFCLK by varying the voltage on the VDDREF pin. The clock signal outputs CLKOUT and CLKOUTB can be used independently to generate single-ended clock signals. The CLKOUT/CLKOUTB outputs can also be combined to generate a differential output signal suitable for LVDS, LVPECL, or HSTL/SSTL signaling. The CDCF5801 is characterized for operation over free-air temperatures of -40°C to 85°C.
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* Data sheet Clock Multiplier With Delay Control and Phase Alignment datasheet (Rev. F) 07 Oct 2005

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