MPC561MZP56 Freescale, MPC561MZP56 Datasheet - Page 536

• Manufacturer Part Number: MPC561MZP56
• Manufacturer: Freescale

Specifications of MPC561MZP56

• Cpu Family: MPC56x
• Device Core: PowerPC
• Device Core Size: 32b
• Frequency (max): 56MHz
• Interface Type: QSPI/SCI/SPI/UART
• Total Internal Ram Size: 32KB
• # I/os (max): 56
• Number Of Timers - General Purpose: 22
• Operating Supply Voltage (typ): 2.6/5V
• Operating Supply Voltage (max): 2.7/5.25V
• Operating Supply Voltage (min): 2.5/4.75V
• On-chip Adc: 2(32-chx10-bit)
• Instruction Set Architecture: RISC
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• Mounting: Surface Mount
• Pin Count: 388
• Package Type: BGA
• Program Memory Type: ROMLess
• Program Memory Size: Not Required
• Lead Free Status / RoHS Status: Not Compliant

QADC64E Legacy Mode Operation
Series resistance can be used with the capacitor on an input signal to implement a simple RC filter. The
maximum level of filtering at the input signals is application dependent and is based on the bandpass
characteristics required to accurately track the dynamic characteristics of an input. Simple RC filtering at
the signal may be limited by the source impedance of the transducer or circuit supplying the analog signal
to be measured. Refer to
cases, the size of the capacitor at the signal may be very small.
Figure 13-52
the interaction between the external circuitry and the circuitry inside the QADC64E.
In
C
to provide charge to C
The following paragraphs provide a simplified description of the interaction between the QADC64E and
the external circuitry. This circuitry is assumed to be a simple RC low-pass filter passing a signal from a
source to the QADC64E input signal. The following simplifying assumptions are made:
13-72
SAMP
Figure
•
•
•
•
is the capacitor array used to sample and hold the input voltage. V
It sources charge during the sample period when the analog signal source is a high-impedance
source.
The external capacitor is perfect (no leakage, no significant dielectric absorption characteristics,
etc.)
All parasitic capacitance associated with the input signal is included in the value of the external
capacitor
Inductance is ignored
V
R
C
C
R
C
V
13-52, R
F
F
P
SRC
SRC
I
SAMP
Source
= Filter Impedance
= Filter Capacitor
= Internal Voltage Source during Sample and Hold
= Internal Parasitic Capacitance
V
is a simplified model of an input channel. Refer to this model in the following discussion of
SRC
= Source Impedance
R
= Source Voltage
SRC
= Sample Capacitor
F
, R
SRC
SAMP
External Filter
Section 13.7.5.3, “Error Resulting from
and C
R F
Figure 13-52. Electrical Model of an A/D Input Signal
during sample phase.
C F
F
MPC561/MPC563 Reference Manual, Rev. 1.2
comprise the external filter circuit. C
Internal Circuit Model
S1
C P
AMP
Leakage,” for more information. In some
S2
QADC64E Sample AMP Model
P
I
is the internal parasitic capacitor.
is an internal voltage source used
C
SAMP
S3
Freescale Semiconductor
VI