Renesas 7700 FAMILY User Manual page 517

APPENDIX
Appendix 8. Examples of noise immunity improvement
(2) Processing analog power source pins, etc.
Use independent power sources for Vcc, AVcc and V
Insert capacitors between the AVcc and AVss pins, and between the V
Reasons: Prevents the A-D converter from noise on the Vcc line.
M37751
AVcc
V
REF
AVss
AN
i
Fig. 11. Processing analog power source pins, etc.
20–66
C1 C2
(sensor, etc.)
7751 Group User's Manual
pins.
REF
Reference value
C1 0.47 µF
C2 0.47 µF
Note : Connect capacitors using the
thickest, shortest wiring possible.
and AVss pins.
REF