HD6417320 RENESAS [Renesas Technology Corp], HD6417320 Datasheet - Page 1011

• Manufacturer Part Number: HD6417320
• Description: Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

27.7.4
By adding capacitance, absolute accuracy may be degraded if noise is on GND because there is
coupling with GND. Therefore, connect electrically stable GND such as AVss to prevent absolute
accuracy from being degraded.
A filter circuit must not interfere with digital signals, or must not be an antenna on a mounting
board.
27.7.5
Operating the chip in excess of the following voltage range may result in damage to chip
reliability.
During A/D conversion, the voltages (VANn) input to the analog input pins ANn should be in the
range AV
27.7.6
In designing a board, separate digital circuits and analog circuits. Do not intersect or locate closely
signal lines of a digital circuit and an analog circuit. An analog circuit may malfunction due to
induction, thus affecting A/D conversion values. Separate analog input pins (AN0 to AN3) and the
analog power voltage (AVcc) from digital circuits with analog ground (AVss). Connect analog
ground (AVss) to one point of stable ground (Vss) on the board.
Influence to Absolute Accuracy
Setting Analog Input Voltage
Notes on Board Design
SS
≤ VANn ≤ AV
Sensor input
Output impedance of sensor
Lowpass
filter
(C = 0.1µF)
to 5 kΩ
Figure 27.8
CC
(n = 0 to 3).
Analog Input Circuit Example
This LSI
C
15 pF
in
=
Rev. 3.00
Equivalent circuit
of A/D converter
3 kΩ
Jan. 18, 2008
Section 27
20 pF
REJ09B0033-0300
Page 949 of 1458
A/D Converter