NEC UPD789426 Series User Manual page 203

CHAPTER 11 10-BIT A/D CONVERTER (
(3) Sample & hold circuit
The sample & 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
which analog inputs are compared.
(6) ANI0 to ANI5
Pins ANI0 to ANI5 are the 6-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 ANI5 with voltages that fall outside the rated range. If a voltage
greater than AV
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 pin
SS
The AV pin is a ground potential pin for the A/D converter. This pin must be held at the same potential as
SS
the V pin, even while the A/D converter is not being used.
SS
(8) AV pin
DD
The AV pin is an analog power supply pin for the A/D converter. This pin must be held at the same
DD
potential as the V pin, even while the A/D converter is not being used.
DD
µ
PD789436 AND 789456 SUBSERIES)
DD
or less than AV (even if within the absolute maximum rating) is applied
DD SS
User's Manual U15075EJ2V1UD
and AV . It generates the reference voltages against
SS
203