CDCM7005中文资料高性能、低相位噪声、低偏移的时钟同步器（使参考时钟与 VCXO 同步）数据手册TI规格书

描述 Description

The CDCM7005 is a high-performance, low phase noise and low skew clock synchronizer thatsynchronizes a VCXO (voltage controlled crystal oscillator) or VCO (voltage controlled oscillator)frequency to one of the two reference clocks. The programmable pre-divider M and thefeedback-dividers N and P give a high flexibility to the frequency ratio of the reference clock toVC(X)O
VC(X)O_IN clock operates up to 2.2 GHz. Through the selection of external VC(X)O and loopfilter components, the PLL loop bandwidth and damping factor can be adjust to meet different systemrequirements.
The CDCM7005 can lock to one of two reference clock inputs (PRI_REF and SEC_REF),supports frequency hold-over mode and fast-frequency-locking for fail-safe and increased systemredundancy. The outputs of the CDCM7005 are user definable and can be any combination of up to fiveLVPECL outputs or up to 10 LVCMOS outputs. The built in synchronization latches ensure that alloutputs are synchronized for low output skew.
All device settings, like outputs signaling, divider value, and input selection areprogrammable by SPI (3-wire serial peripheral interface). SPI allows individually control of thedevice settings.
The device operates in 3.3-V environment and is characterized for operation from –40°C to85°C.

特性 Features

• High Performance LVPECL and LVCMOS PLL Clock Synchronizer
• Two Reference Clock Inputs (Primary and Secondary Clock) for Redundancy SupportWith Manual or Automatic Selection
• Accepts LVCMOS Input Frequencies up to 200 MHz
• VCXO_IN Clock is Synchronized to One of the Two Reference Clocks
• VCXO_IN Frequencies Up to 2.2 GHz (LVPECL)
• Outputs Can Be a Combination of LVPECL and LVCMOS (Up to Five Differential LVPECLOutputs or up to 10 LVCMOS Outputs)
• Output Frequency is Selectable by ×1, /2, /3, /4, /6, /8, /16 on Each OutputIndividually
• Efficient Jitter Cleaning From Low PLL Loop Bandwidth
• Low Phase Noise PLL Core
• Programmable Phase Offset (PRI_REF and SEC_REF to Outputs)
• Wide Charge Pump Current Range From 200 µA to 3 mA
• Dedicated Charge Pump Supply (VCC_CP) for Wide Tuning Voltage Range VCOs
• Presets Charge Pump to VCC_CP/2 for Fast Center-Frequency Setting ofVC(X)O
• Analog and Digital PLL Lock Indication
• Provides VBB Bias Voltage Output for Single-Ended Input Signals(VCXO_IN)
• Frequency Hold-Over Mode Improves Fail-Safe Operation
• Power-up Control Forces LVPECL Outputs to 3-State at VCC