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11/07/11 20:24
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#184583 - One other quick question for all you smart people.
Responding to: Andy Neil's previous message
Sweet. I2C was a pain in the butt too, making sure you get an ACK or a NACK, blah blah. With SPI, it looks like you select the device with a port pin, then shoot the data out.

One other question, off-topic, if anyone would be so kind....
I planned on scaling a 0-5V Analog signal to a 0-3.3 volt signal for an ADC to read. I was going to use a couple resistors. The thing is, the Voltage signal is at a high frequency (~4kHZ) and will be sampled at around 10-12kHZ. Will I lose any resolution or add any noise to the circuit by doing this, or would I be better off getting an ADC with a 5V VREF?

I can provide more info if need be. Thanks.

List of 13 messages in thread
Looking for 8051 that supports high speed I2C      John M      11/02/11 15:22      
   SPI      Per Westermark      11/02/11 16:06      
      gotcha      John M      11/02/11 21:03      
         3.4 MHz I2C      Andy Peters      11/04/11 13:13      
            RE: SPI is simpler      Andy Neil      11/04/11 14:03      
               One other quick question for all you smart people.      John M      11/07/11 20:24      
                  Some things to consider....      Michael Karas      11/08/11 05:11      
                     Full range and clipping      Per Westermark      11/08/11 05:24      
                        Impedance      John M      11/08/11 06:04      
                           You sure?      Per Westermark      11/08/11 06:18      
                           Impedance With Divider      Michael Karas      11/08/11 09:00      
                           Impedance matching      Andy Neil      11/08/11 15:54      
   if I recall      Erik Malund      11/03/11 07:13      

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