MMC2114 MOTOROLA [Motorola, Inc], MMC2114 Datasheet - Page 519
MMC2114
Manufacturer Part Number
MMC2114
Description
M CORE Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MMC2114.pdf
(654 pages)
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19.11.6 Analog Input Considerations
MMC2114 • MMC2113 • MMC2112 — Rev. 1.0
MOTOROLA
The current into (I
coupling ratio) of the parasitic bipolar transistor (K
expressed by this equation:
Where:
A method for minimizing the impact of stress conditions on the QADC is
to strategically allocate QADC inputs so that the lower accuracy inputs
are adjacent to the inputs most likely to see stress conditions.
Also, suitable source impedances should be selected to meet design
goals and minimize the effect of stress conditions.
The source impedance of the analog signal to be measured and any
intermediate filtering should be considered whether external
multiplexing is used or not.
typical analog signal sources to one QADC analog input pin through a
separate multiplexer chip. Also, an example of an analog signal source
connected directly to a QADC analog input channel is displayed.
I
I
Freescale Semiconductor, Inc.
In
INJ
For More Information On This Product,
Queued Analog-to-Digital Converter (QADC)
= – K
is either I
N
Go to: www.freescale.com
* I
INJ
INJN
In
) the neighboring pin is determined by the K
or I
INJP
Figure 19-52
.
Queued Analog-to-Digital Converter (QADC)
shows the connection of eight
Pin Connection Considerations
N
‹‹ 1). The I
Advance Information
N
In
(current
can be
519
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