AN2752 Analog-to-digital converter (ADC)
Doc ID 14651 Rev 3 11/42
Equation 1:
where:
● C
VIN
is the total equivalent capacitor on the path of V
IN
●
C
SAMP
is the equivalent sampling capacitance
● C
EXT
is the total external capacitance on the path of V
IN
to the macro pin. This includes
parasitic routing capacitance, pad and pin capacitance and external capacitance. To
ensure proper and accurate sampling the following equation must be satisfied
Equation 2:
where:
● R
SW
= 30 kOhm
● R
EXT
is the total external resistance on the path of V
IN
●
C
SAMP
= 3 pF
● T
S
= 0.5 µs (for 2 MHz input CLK)
Equation 2 is specific for R
EXT
and C
EXT
when designing an analog input interface for the
ADC.
Please refer to the Root part number 2 datasheet and/or the corresponding family reference
manual (RM0016) for more details.
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