SPC5646CCF0MLT1 Freescale Semiconductor, SPC5646CCF0MLT1 Datasheet - Page 72

• Manufacturer Part Number: SPC5646CCF0MLT1
• Description: 32-bit Microcontrollers - MCU 3M FLASH,25 6K RAM,CSE
• Manufacturer: Freescale Semiconductor

Specifications of SPC5646CCF0MLT1

• Rohs: yes
• Core: e200
• Processor Series: MPC5646C
• Data Bus Width: 32 bit
• Maximum Clock Frequency: 120 MHz
• Program Memory Size: 3 MB
• Data Ram Size: 256 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 0.3 V to 6.2 V
• Operating Temperature Range: - 40 C to + 125 C
• Package / Case: LQFP-208
• Mounting Style: SMD/SMT
• A/d Bit Size: 10 bit, 12 bit
• A/d Channels Available: 33
• Interface Type: CAN, I2C, SCI, SPI
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 177
• Number Of Timers: 32
• Program Memory Type: Flash
• Supply Voltage - Max: 6.2 V
• Supply Voltage - Min: 0.3 V

Electrical Characteristics
4.17.1.1
To preserve the accuracy of the A/D converter, it is necessary that analog input pins have low AC impedance. Placing a capacitor
with good high frequency characteristics at the input pin of the device, can be effective: the capacitor should be as large as
possible, ideally infinite. This capacitor contributes to attenuating the noise present on the input pin; furthermore, it sources
charge during the sampling phase, when the analog signal source is a high-impedance source. A real filter, can typically be
obtained by using a series resistance with a capacitor on the input pin (simple RC Filter). The RC filtering may be limited
according to the value of source impedance of the transducer or circuit supplying the analog signal to be measured. The filter
at the input pins must be designed taking into account the dynamic characteristics of the input signal (bandwidth) and the
equivalent input impedance of the ADC itself.
In fact a current sink contributor is represented by the charge sharing effects with the sampling capacitance: being CS and Cp
substantially two switched capacitances, with a frequency equal to the conversion rate of the ADC, it can be seen as a resistive
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code out
Input impedance and ADC accuracy
1023
1022
1021
1020
1019
1018
Offset Error OSE
7
6
5
4
3
2
1
0
1
Figure 15. ADC_0 characteristic and error definitions
2
3
MPC5646C Microcontroller DataSheet, Rev. 5.1
4
1 LSB (ideal)
5
6
(4)
(3)
7
(2)
(5)
V
1017 1018 1019 1020 1021 1022 1023
in(A)
(LSB
ideal
(1)
(1) Example of an actual transfer curve
(2) The ideal transfer curve
(3) Differential non-linearity error (DNL)
(4) Integral non-linearity error (INL)
(5) Center of a step of the actual transfer curve
Offset Error OSE
)
1 LSB ideal = V
DD_ADC
Gain Error GE
/ 1024
Freescale
2