Re: Protecting ADC Inputs
From: Bob Masta (NoSpam_at_daqarta.com)
Date: 12/28/04
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Date: Tue, 28 Dec 2004 14:30:01 GMT
On Mon, 27 Dec 2004 18:31:07 -0600, "Richard" <rwskinner ATawesomenet
Dot net> wrote:
>I'm built a circuit board for my Analog card. My normal inputs will be 0-5
>vdc but the max allowed on the ADC is 10 vdc.
>I was thinking about putting some zeners across the input circuit so the
>voltage will never go above 10 volts. I left a space from each input to
>ground for a surface mount 1/2 watt resistor. These were there so we could
>do a 4-20ma conversion.
>
>So, First, will zeners work without affecting my normal input voltage?
>Second, are zeners available close to the 10 volt range?
>
>Any better simplier solutions?
>
My choice would be to use a series resistor with
reverse-biased clamp diodes to each rail. (This
is a popular method used for example on the
inputs to CMOS logic gates.) This assumes that
the input impedance of the ADC is high, and the
small RC with the effective diode capacitance is
compatible with your signals.
Best regards,
Bob Masta
dqatechATdaqartaDOTcom
D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com
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