Level translation

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Ste_Trat

Joined Aug 25, 2017
1
Dear all,

Just to let you know: i do not have an professional electronics background, but i am into electronics more on a hobbyist level i would say.

So my current project ist dealing with an low noise ADC: AD7193, with which i would like to read an analog signal in the range of +/-10 Volt.
To achieve this i need something like a 1:10 divider giving me range of +/- 1V.
The range the ADC can handle, according to the data sheet AD7193 is: -/+ (AVDD -1.25V) ~ -3.75V to +3.75V.
What confuses me here the most, is: this is a single supply device, why can the input handle voltages below ground?

At the moment i think the most reasonable to read the intented +/- 10 Volt signal, would be with AD8275 as in the circuit note: CN0209.
This op amp has a reference, and a fixed gain of 0.2, giving an output that would fit my needs, but: this device is dedicated for 16 bit applications, so here are some more questions coming up in my mind.

So this is my current standpoint. I hope anyone could help me, by giving some advice, what would be the easiest way of doing this.

Regards Stephan
 

ericgibbs

Joined Jan 29, 2010
11,096
hi Ste,
Welcome to AAC.
I would point out that it will 'tolerate' the 'absolute' below voltages on the Analog pins not give a Digital output.
This under voltage limit is typical of many semiconductor devices.
E
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