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AN2834 датащи(PDF) 24 Page - STMicroelectronics

номер детали AN2834
подробное описание детали  How to get the best ADC accuracy in STM32Fx Series and STM32L1 Series devices
PDF  45 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2834 датащи(HTML) 24 Page - STMicroelectronics

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How to get the best ADC accuracy
AN2834
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DocID15067 Rev 2
Note:
The voltage on VREF+ may range between 2.4 V and VDDA.
Figure 23. Selecting the reference voltage
Using a preamplifier
If the measured signal is too small (in comparison with the ADC range) then it is good to use
an external preamplifier. This method can be implemented with STM32x devices delivered
in all packages, and more specifically so in packages that do not have the VREF+ input.
For example, if the measured signal varies between 0 V to 1 V and VDDA is 3 V, the signal
can be amplified so that its peak-to-peak amplitude is similar to the VDDA value. The gain
will then be equal to 3. Figure 24 illustrates this example.
This amplifier can adapt the input signal range to the ADC range. It can also insert offsets
between the input signal and the ADC input. Care must be taken in the preamplifier design
not to generate additional errors (for example additional offset, amplifier gain stability,
linearity, frequency response, etc.).
Figure 24. Preamplification
t
t
Digital
Output
4095
2.5
------------- V
in
=
Digital
Output
4095
3.3
------------- V
in
=
2.5 V
(3102h)
VREF+ = 3.3 V
(4095h)
V
unused ADC
transition range
VREF+ = 2.5 V
(4095h)
V
Change VREF+
value from
3.3 V to 2.5 V
ai15600
t
t
Digital
Output
4095
3
V
in
=
Digital
Output
4095
3
------------- V
in
=
1 V
(1365h)
VDDA = 3 V
(4095h)
V
unused ADC
transition range
Input signal max
value is 3 V
(4095h)
V
G = 3
ai15601
Before amplification
G
After amplification



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