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CHAPTER 14 A/D CONVERTER
250
(7) AV
REF
pin
This pin inputs the A/D converter reference voltage.
It converts signals input to ANI0 to ANI7 into digital signals according to the voltage applied between AV
REF
and
AV
SS
. If the voltage to be input to the AV
REF
pin is adjusted to the AV
SS
level in the standby mode, the current
in the series resistor string will be decreased.
Caution A series resistor string of approximately 10 k
Ω
is connected between the AV
REF
pin and the
AV
SS
pin.
Therefore, if the output impedance of the reference voltage source is high, this will result in
parallel connection to the series resistor string between the AV
REF
pin and the AV
SS
pin, and
there will be a large reference voltage error.
(8) AV
SS
pin
Ground potential pin of the A/D converter. It must be at the same level as the V
SS
pin even if the A/D converter
is not used.
(9) AV
DD
pin
Analog power supply pin of the A/D converter. It must be at the same level as the V
DD
pin even if the A/D converter
is not used.
Содержание 78014Y Series
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