[Coco] new high density controller

[jdaggett at gate.net]

On 9 Aug 2006 at 18:28, Mike Pepe wrote:

> > The passives required are only really a couple of pots, a couple of
> > resistors and a diode.
> > 
> 
> The values for the components that drive the pump pin are different for
> the two data rates.
> 
*****************

The integrator ( filter) circuit on the PUMP pin, which by the way is an output, is there to 
filter the error pulses generated by the phase detector of the VCO system. You need to only 
have one value for this filter. The widest step in frequency would determine the cutoff 
frequency of the integrator. In the case of SD to HD would be  the frequency difference 
between 125Kb/Sec to 500Kb/Sec data stream.


james