CHAPTER 12 10-BIT A/D CONVERTER (
µ
PD789114, 789134 SUBSERIES)
User’s Manual U13045EJ2V0UM00
151
(3) Sample and hold circuit
The sample-and-hold circuit samples consecutive analog inputs from the input circuit, one by one, and sends
them to the voltage comparator. The sampled analog input voltage is held during A/D conversion.
(4) Voltage comparator
The voltage comparator compares an analog input with the voltage output by the series resistor string.
(5) Series resistor string
The series resistor string is configured between AV
DD
and AV
SS
. It generates the reference voltages against
which analog inputs are compared.
(6) ANI0 to ANI3 pins
Pins ANI0 to ANI3 are the 4-channel analog input pins for the A/D converter. They are used to receive the
analog signals for A/D conversion.
Caution Do not supply pins ANI0 to ANI3 with voltages that fall outside the rated range. If a voltage
greater than AV
DD
or less than AV
SS
(even if within the absolute maximum rating) is supplied
to any of these pins, the conversion value for the corresponding channel will be undefined.
Furthermore, the conversion values for the other channels may also be affected.
(7) AV
SS
pin
The AV
SS
pin is a ground potential pin for the A/D converter. This pin must be held at the same potential as
the V
SS
pin, even while the A/D converter is not being used.
(8) AV
DD
pin
The AV
DD
pin is an analog power supply pin for the A/D converter. This pin must be held at the same potential
as the V
DD
pin, even while the A/D converter is not being used.
Summary of Contents for mPD789101
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