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MC56F81663 Scheda tecnica(PDF) 57 Page - NXP Semiconductors

Il numero della parte MC56F81663
Spiegazioni elettronici  DSC based on 32-bit 56800EX core
PDF  73 Pages
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Produttore elettronici  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo NXP - NXP Semiconductors

MC56F81663 Scheda tecnica(HTML) 57 Page - NXP Semiconductors

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11.5.1.1 Equivalent circuit for ADC inputs
The following figure shows the ADC input circuit during sample and hold. S1 and S2 are
always opened/closed at non-overlapping phases, and both S1 and S2 are dependent on
the ADC clock frequency. The following equation gives equivalent input impedance
when the input is selected.
Freescale Semiconductor
32
1
(ADC ClockRate) x CADI
+Resistor
+
ohm
50
NOTE
Resistor=1200 ohm@gain1×, or 730 ohm@gain2×, or 500
ohm@gain4×
1
2
Analog Input
S1
S1
S2
C1
C1
S/H
(VREFHx - VREFLx ) / 2
50  ESD
Resisto
r
S2
S1
S1
Channel Mux
equivalent resistance
C1
C1
Resistor(value see the note)
1. Parasitic capacitance due to package, pin-to-pin and pin-to-package base coupling =
1.8pF
2. Parasitic capacitance due to the chip bond pad, ESD protection devices and signal
routing = 2.04pF
3. S1 and S2 switch phases are non-overlapping and depend on the ADC clock
frequency
S 1
S 2
Figure 11. Equivalent circuit for A/D loading
System modules
MC56F81xxx, Rev. 1.1, 12/2020
NXP Semiconductors
57



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