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AN4092 Datasheet(PDF) 25 Page - STMicroelectronics

Part # AN4092
Description  Low to mid range engine management
PDF  38 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4092 Datasheet(HTML) 25 Page - STMicroelectronics

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AN4092
ADC
Doc ID 023080 Rev 2
25/38
4
ADC
The goal of this chapter is to provide hints on how to dimension correctly the external ADC
circuitry in order to reduce errors and, at the same time, to protect the ADC inputs.
Figure 10.
Simplified ADC circuitry
The Figure 10 shows a simplified scheme of the external and internal circuit.
The external analogue source can be represented as a voltage source with its impedance
(Rs). Then it is a common practice to put an RC circuit to filter the analogue source; in
addition Rf can be also useful as current limiter in case of overvoltage.
Table 6.
SPC564Axx / SPC563Mxx ADC parameters
Parameter
Min.
Nominal
Max
Cp
-
-
12pF
Rsw
-8KOhm
21KOhm
(3 sigma, 150C)
Cs (single ended)
-
-
0.8pF
Cs (differential)
-
-
1.3pF
ADC clock frequency
-
-
16MHz
Sampling time (ADC
clocks)
2-
128
12bit single ended
conversion time (ADC
clocks)
-14
-
12bit differential
conversion time (ADC
clocks)
-13
-
Residual voltage on
sample capacitor
1.25V
-
3.75V



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