ST10F273Z4 STMicroelectronics, ST10F273Z4 Datasheet - Page 143

• Manufacturer Part Number: ST10F273Z4
• Description: 16-BIT MICROCONTROLLER WITH MAC UNIT, UP TO 832 KBYTES FLASH MEMORY AND UP TO 68 KBYTES RAM
• Manufacturer: STMicroelectronics

Specifications of ST10F273Z4

• Single Voltage Supply: 5 V ±10%

ST10F273Z4
above, it is simple to derive the following relation between the ideal and real sampled
voltage on C
From this formula, in the worst case (when V
assuming to accept a maximum error of half a count (~2.44mV), it is immediately evident a
constraints on C
In the next section an example of how to design the external network is provided, assuming
some reasonable values for the internal parameters and making hypothesis on the
characteristics of the analog signal to be sampled.
24.7.4.1 Example of external network sizing
The following hypothesis are formulated in order to proceed in designing the external
network on A/D Converter input pins:
●
●
●
●
●
●
●
●
●
●
●
Analog Signal Source Bandwidth (f
Conversion Rate (f
Sampling Time (T
Pin Input Capacitance (C
Pin Input Routing Capacitance (C
Sampling Capacitance (C
Maximum Input Current Injection (I
Maximum Analog Source Voltage (V
Analog Source Impedance (R
Channel Switch Resistance (R
Sampling Switch Resistance (R
S
:
F
value:
S
C
):
):
P1
S
-----------
V A2
):
):
V A
S
SW
):
AD
=
):
P2
------------------------------------------------------------
C P1
):
C F 2048 C S
INJ
0
):
):
AM)
C P1
): 3mA
>
+
:12V
A
10 kHz
25 kHz
1µs
5pF
1pF
4pF
100Ω
500Ω
200Ω
C P2
+
is maximum, that is for instance 5V),
C P2
⋅
+
C F
+
C F
+
C S
Electrical characteristics
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