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AN4092 датащи(PDF) 29 Page - STMicroelectronics

номер детали AN4092
подробное описание детали  Low to mid range engine management
PDF  38 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4092 датащи(HTML) 29 Page - STMicroelectronics

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AN4092
ADC
Doc ID 023080 Rev 2
29/38
Let’s choose Ts = 64 and continuos conversion.
The external RC time constant Rf(Cf+Cp) is 1.496us, therefore Ts is about 3 times that
constant, meaning that the second exponential transient is not really over. However, the
voltage drop due to the charge share is only (Equation 6: ) 4.41mV (worst case(n)), leading
to a negligible error (being Ts = 3 x time constant).
EXAMPLE 2
Let’s assume that:
●
Vamax = 24V
●
Rs = 100Ohm
●
f0 = 50Hz
Using the Equation 1:
Let’s choose Rf = 6.2KOhm.
Then, from the Equation 3:
Let’s choose Cf = 470nF.
In this case, being the signal slow, we can simply choose the maximum sampling time: Ts =
128. Then the ADC can be triggered by an internal timer to meet the Nyquist requirement fN
= 2f0.
The capacitance Cf is much bigger than the internal one, leading to a negligible voltage drop
and hence basically no conversion errors due to the charge sharing, hence allowing
potentially even smaller sampling times, reducing the overall conversion time.
n.
The worst case is 3.75V, difference between the sample voltage and the residual voltage on the sample
capacitance.
T
s
80
14
66ADCclockcycles
=
–
=
R
f
24
5.5
–
310
3
–
⋅
---------------------
100
–
6K
Ω
≅
≥
C
f
1
2
π50 6.2 10
3
⋅
()
-----------------------------------------
513nF
=
=



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