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???
12/07/10 16:06
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 		 #179952 - Interfacing is the least of your problems!
Responding to: ???'s previous message
Daniel Formosa said:
For precision I will have to interface a 16-bit ADC

For a 16-bit reading to be meaningful, your analogue input circuitry needs to be precise and stable to at least the same measure; ie, 1 part in 216 - and your noise level needs to be well below that!

I plan to have the ADC interfaced with the 8255 and with the 8051.

That's a crazy plan!

Why not look for I2C or SPI connected ADCs?


List of 34 messages in thread
TopicAuthorDate
ADC to interface with 8051            01/01/70 00:00      
   Interfacing is the least of your problems!            01/01/70 00:00      
      16bit interface ADC to 8051            01/01/70 00:00      
         presicion engineering            01/01/70 00:00      
            Responding to Andy Neil mechanical part            01/01/70 00:00      
         dead easy, but            01/01/70 00:00      
   Many options            01/01/70 00:00      
      also            01/01/70 00:00      
      Responding to Oliver Sedlacek            01/01/70 00:00      
         Cart before horse?            01/01/70 00:00      
            Responding to Andy Neil            01/01/70 00:00      
               UH OH            01/01/70 00:00      
   "the"?            01/01/70 00:00      
      Responding to Erik Malund            01/01/70 00:00      
         Teachers doesn't always hint at the easiest solution            01/01/70 00:00      
            and some are lazy            01/01/70 00:00      
         Not a useful skill to learn            01/01/70 00:00      
            educational value?            01/01/70 00:00      
               8255 has an excellent datasheet            01/01/70 00:00      
                  Oh, please!            01/01/70 00:00      
   This will require very precise components and great skill            01/01/70 00:00      
      Audio don't require good voltage reference            01/01/70 00:00      
         Yes, but it's not cheap            01/01/70 00:00      
            They normally specify an SN figure instead            01/01/70 00:00      
               Marketing "specification" rather than engineering            01/01/70 00:00      
                  Still looking at wrong parameter            01/01/70 00:00      
                     maybe not            01/01/70 00:00      
                        Actually big need - audio sources, mixer etc are 24-bit            01/01/70 00:00      
                           drifting            01/01/70 00:00      
            no problem            01/01/70 00:00      
               Weeks??            01/01/70 00:00      
                  Depends            01/01/70 00:00      
         audio and voltage references            01/01/70 00:00      
   ADC to interface with 8051            01/01/70 00:00      

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