MPC564EVB Freescale Semiconductor, MPC564EVB Datasheet - Page 535
![KIT EVAL FOR MPC561/562/563/564](/photos/39/39/393946/mpc564evbimage_sml.jpg)
MPC564EVB
Manufacturer Part Number
MPC564EVB
Description
KIT EVAL FOR MPC561/562/563/564
Manufacturer
Freescale Semiconductor
Type
Microcontrollerr
Specifications of MPC564EVB
Contents
Module Board, Installation Guide, Power Supply, Cable, Software and more
Processor To Be Evaluated
MPC56x
Data Bus Width
32 bit
Interface Type
RS-232, Ethernet
For Use With/related Products
MPC561, 562, 563, 564
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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13.7.4
V
reference inputs from the power supply signals allows for additional external filtering, which increases
reference voltage precision and stability, and subsequently contributes to a higher degree of conversion
accuracy.
No A/D converter can be more accurate than its analog reference. Any noise in the reference can result in
at least that much error in a conversion. The reference for the QADC64E, supplied by signals V
V
capacitive bypassing may sufficed. In extreme cases, inductors or ferrite beads may be necessary if noise
or RF energy is present. Series resistance is not advisable since there is an effective DC current
requirement from the reference voltage by the internal resistor string in the RC DAC array. External
resistance may introduce error in this architecture under certain conditions. Any series devices in the filter
network should contain a minimum amount of DC resistance.
13.7.5
Analog inputs should have low AC impedance at the signals. Low AC impedance can be realized by
placing a capacitor with good high frequency characteristics at the input signal of the part. Ideally, that
capacitor should be as large as possible (within the practical range of capacitors that still have good high
frequency characteristics). This capacitor has two effects:
Freescale Semiconductor
RH
RL
•
, should be low-pass filtered from its source to obtain a noise-free, clean signal. In many cases, simple
and V
It helps attenuate any noise that may exist on the input.
PCB
RL
Analog Reference Signals
Analog Input Signals
are the dedicated input signals for the high and low reference voltages. Separating the
+5V
Figure 13-51. Star-Ground at the Point of Power Supply Origin
Analog Power Supply
AGND
QADC64E
MPC561/MPC563 Reference Manual, Rev. 1.2
+5V
VDD
VSS
PGND
Digital Power
QADC64E Legacy Mode Operation
Supply
+5V
RH
, and
13-71
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