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???
01/31/06 21:29
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 		 #108840 - Oscillator Comparison
Responding to: ???'s previous message
Just as a comparison I looked at the voltages of the oscillator with different cap values:

Crystal - 11.0592 MHz - Fundamental mode-AT-CUT - 18pF

Cap value Voltage
0pF (no caps) 3.4 Vpp
5pF 2.9 Vpp
18pF (correct load)1.4 Vpp

On the AT89S8252 - same PCB design:

18pF 4.4 Vpp
18pF - 24 MHz 4.0 Vpp

The above 24 MHz crystal has the same specs as the 11.0592. The drive voltages from the AT89S8253 are quite low! Even with no caps.

Trev

List of 27 messages in thread
TopicAuthorDate
AT89S8253 Clock Oscillator Problem            01/01/70 00:00      
   Crazy value            01/01/70 00:00      
      RE:Crazy value - AT89S8252 Osc Loading            01/01/70 00:00      
         oscillates ?            01/01/70 00:00      
            Oscillator Comparison            01/01/70 00:00      
               PRE tags            01/01/70 00:00      
                  Table explained            01/01/70 00:00      
                  External Oscillator            01/01/70 00:00      
   if "around 7" is 8, then I would say you            01/01/70 00:00      
      I'd say so, but...            01/01/70 00:00      
         3rd overtone crystals are "real fun"            01/01/70 00:00      
      3rd overtone            01/01/70 00:00      
         please elaborate            01/01/70 00:00      
            not a string            01/01/70 00:00      
            Tuning the marimba...            01/01/70 00:00      
               waaay beyond the subject rel to above            01/01/70 00:00      
                  Evelyn Glennie            01/01/70 00:00      
                     thanks, Steve            01/01/70 00:00      
         Excerpts from a Maxim appnote            01/01/70 00:00      
      24 MHz Fundamental Mode            01/01/70 00:00      
         If history repeats itself, you are going            01/01/70 00:00      
            Come on...            01/01/70 00:00      
         Read between the lines...            01/01/70 00:00      
            Thanks Kai - AT89S8253, LP4052            01/01/70 00:00      
               to Trevor            01/01/70 00:00      
         G8DVN            01/01/70 00:00      
            OT:Get that HF Ticket!            01/01/70 00:00      

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