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ABRACON CORPORATION was established August 5, 1992 with the vision of becoming a top tier global manufacturer of frequency control, Signal Conditioning, Clock Distribution, and Magnetic Components with local design and technical support.      
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* Programmable Oscillator Information Center *

The new APxS series Low Jitter Programmable Oscillators up to 200MHz are ideal for a wide range of applications from quick turn engineering prototypes to mass production quantities. The APxS series can be substituted for fixed frequency Oscillators. If jitter noise has caused you to hesitate using programmable oscillators in the past, try the new Abracon AP2S, AP3S, AP5S, or AP7S series for jitter performance that is comparable to longer lead time fixed frequency oscillators. You no longer need to wait weeks for those custom frequency Oscillators!

Abracon's Conventional Programmable Oscillators (ACOP, ACHLP, ASLP, ASVP, ASFLP, ASEP) offer a cost saving drop in replacement opportunity for competitor series SG8002, CPPX, CSX750P, S-8002C, ECS-PXX, EPO, and other first generation Programmable Oscillators where jitter and phase noise are not a concern.

All of Abracon's programmable oscillators offer custom or standard output frequencies with extremely short lead times averaging 1-5 days for small quantity orders. Abracon's Programmable Oscillators are available for order through any of our authorized Distribution Partners.

NEW APxS SERIES



LOW JITTER PROGAMMABLE OSCILLATORS! CUSTOM FREQUENCIES SHIPPED WITHIN 1-5 DAYS! (Quantities under 1000 pieces)
Click here to view our product selection, create a part number and submit an RFQ.

 view APxS Series

1st GENERATION PROGRAMMABLES



LOW JITTER PROGAMMABLE OSCILLATORS! CUSTOM FREQUENCIES SHIPPED WITHIN 1-5 DAYS! (Quantities under 1000 pieces)
Click here to view our product selection, create a part number and submit an RFQ.

 view 1st Generation Oscillators

Jitter Considerations

• Jitter
  – Definitions of Jitter
  – Types of jitter and their causes
  – Jitter from different circuit concepts

• Board Design Considerations
  – Signal Integrity Preservation
  – Differential and Single Ended terminations
  – Decoupling and Power Supply Considerations
  – Crystal Tuning

• Crystal Selection
  – Specifications: Cload, ESR, Drive Level, C0, C1
  – Packaging and it's effects
  – XO requirements vs. VCXO requirements


Types of Jitter and their causes

• Random Jitter (RJ)
  – Definition: Jitter produced by random noise sources
  – Causes: Thermal noise, background noise, 1/f noise, …

Deterministic Jitter (DJ)
  – Definition: Jitter produced by system sources
  – Causes: Crosstalk, Subharmonics, …

• Total Jitter (TJ)
  – Definition: An approximation of the Peak to Peak jitter measured over 10 -12 hits using a BER multiplier factor ( 14.069 for 10 -12 BER )
  – Calculation – TJ = RJ(14.069) + DJ

High Frequency Phase Noise Measurement

APxS with output frequency programmed to 133.330MHz
Phase Noise Plot (25MHz x 5.33=133.33MHz)


Period Jitter

Compares the length of time of randomly picked periods for a defined number of hits / samples from an initial clock edge.

  

• Measure the length of a lot (10,000) of periods.
• Peak-to-Peak Jitter: The difference between the shortest and longest period.
• RMS Jitter: The standard deviation from a statistical analysis on all period lengths.


Cycle to Cycle Jitter

Compares the length and time of two adjacent periods over a number of sample sets.

  

• Cycle to Cycle Jitter describes the changes in length from one period to the next adjacent period.
• Peak-to-peak: The difference between the smallest and largest "change".
• RMS: The standard deviation from the statistical analysis on the observed "changes".

Board Design Considerations

Signal Integrity Preservation
  – Keep traces short!

Trace = Inductor. With a capacitive load this equals ringing!

Long trace = Transmission Line. Without proper termination this will cause reflections ( looks like ringing ).

Design long traces as "striplines" or "microstrips" with defined impedance.

Match trace at one side to avoid reflections bouncing back and forth.
  – CMOS: Match trace at start with series resistor
  – PECL / LVDS: Match at the end with 50ohms each or 100ohms differential.
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