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Re: [avr-gcc-list] ATmega16 ADC at High Clock Rates
From: |
Keith Gudger |
Subject: |
Re: [avr-gcc-list] ATmega16 ADC at High Clock Rates |
Date: |
Tue, 16 Aug 2005 11:57:59 -0700 (PDT) |
In our case, the max clock was 1 MHz. Above ~250 KHz you drop to 9 bits,
above 500 KHz you somewhere between 8 and 9, but that was fine for us.
Keith
On Tue, 16 Aug 2005, User Tomdean wrote:
> The ATmega16 datasheet states, in part,
>
> By default, the successive approximation circuitry requires an input
> clock frequency between 50 kHz and 200 kHz to get maximum
> resoultion. If a lower resolution than 10 bits is needed, the input
> clock frequency to the ADC can be higher than 200 kHz to get a
> higher sample rate.
>
> The datasheet does not specify the reduction in resolution due to a
> higher clock rate.
>
> Before I measure, does anyone know the reduction in resoultion, say,
> at 1 mHz? 2 mHz?
>
> tomdean
>
>
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