Will i need amplifier in this case?

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Using a 12-bit ADC with a range of +50mV to -50mV for a signal with a peak-to-peak voltage of 0.7mV to 1mV may not provide sufficient resolution, as it results in only 29 readings within that range. An amplifier is recommended to enhance the signal resolution, especially given the small voltage difference of 300uV that needs to be measured accurately. Input noise from the ADC can further complicate direct measurements, reinforcing the need for amplification. The required resolution ultimately depends on the specific measurement goals and the nature of the signal. For optimal performance, a gain of around 50 for the amplifier is suggested to effectively capture the desired signal variations.
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Hi:

i have ADC(analog to digital) has a resolution 12 bits
and the input range is from +50mV to -50mV,
this men the precision is about 24uV

i want to use this ADC for a signal has Vp.p from 0.7mV to 1mV

so
can i use this ADC directly?or i must use amplifier ??
 
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You could just use the ADC but the problem is you only have 12 readings in that voltage range. If you need more resolution than that you need an amplifier.
 
Floid said:
You could just use the ADC but the problem is you only have 12 readings in that voltage range. If you need more resolution than that you need an amplifier.
no, i have 29 readings (from 700uV/24uV) .

Floid said:
If you need more resolution than that you need an amplifier.

how can i know what is the resolution i must use??
is there any equation to determine the resolution?
 
samaaa said:
no, i have 29 readings (from 700uV/24uV) .



how can i know what is the resolution i must use??
is there any equation to determine the resolution?

The resolution you need depends on what you are trying to measure, in some cases two values might be enough!

However, remember that the input noise of your ADC is also an issue, so in real life you will always need an amplifier.
Just get/build an amplifer with a gain of 50.
 
no, i have 29 readings (from 700uV/24uV) .

If you have a signal that you know ranges from 0.7mv to 1mv I would think that when measuring it your interest would be in the 300uV difference between the two.
 
Floid said:
If you have a signal that you know ranges from 0.7mv to 1mv I would think that when measuring it your interest would be in the 300uV difference between the two.

you don't understand me, the signal has Vp.p=700uV or 1 Vp.p(ECG signal)
the range may be from - 500uV to 500uV
 
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