ADV7282A 28.636MHz Quartz Specification

Question

How critical is the ESR value for the 28.63636MHz for this product, I am having a few issues with suppliers. 
 I have various suppliers with different ESR Max values, 35ohms another with 40 ohms and another with 50ohms on their datasheets for this 28.63636MHz quartz in this package size. 
 How will this affect or not affect my setup. 
 Also I would like clarification on the total frequency tolerance required for this product, on page 6 of the datasheet is states 
 ,Frequency Stability &plusmn;50 ppm 
 But then in the table on page 16 it states, 
 Frequency Calibration (at 25&deg;C) &plusmn;20 ppm Frequency Temperature StabilityTolerance &plusmn;50 ppm 
 Aging per Year &plusmn;3 ppm 
 So does that mean that to get the total tolerance I have 20ppm + 50ppm + aging?

FormerMember · Accepted Answer

The crystal used to design the original oscillator is attached. The basic design has changed very little over the years. See the attached pdf. This part is hard to get now but readily available from other vendors. 
 PDF 
 Initial tolerance += 30 ppm 
 Over temp +- 50 ppm 
 ageing +- 3ppm/year. 
 Depending on the circuit this crystal is used to generate the color burst frequency, Other circuits use it for timing measurement.)

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ADV7282A 28.636MHz Quartz Specification

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