SH7263 Datasheet, PDF (1210/1862 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

Section 22 A/D Converter (ADC)
Sensor input
Sensor output impedance
Up to 5 kΩ
Low-pass filter
C to 0.1 μF
This LSI
Cin =
15 pF
A/D converter
equivalent circuit
3 kΩ
20 pF
Note: Values are reference values.
Figure 22.10 Example of Analog Input Circuit
22.7.6 Influences on Absolute Precision
Adding capacitance results in coupling with GND, and therefore noise in GND may adversely
affect absolute precision. Be sure to connect AVss, etc. to an electrically stable GND.
Care is also required to insure that filter circuits do not communicate with digital signals on the
mounting board (i.e., acting as antennas).
22.7.7 A/D Conversion in Deep Standby Mode
Before entering deep standby mode, disable A/D conversion by clearing the ADST bit to 0. If the
LSI enters deep standby mode with A/D conversion enabled, the states on the A/D converter pins
are not guaranteed.
22.7.8 Note on Usage in Scan Mode and Multi Mode
Switching to single mode and then starting conversion immediately after having stopped scan
mode or multi mode operation may lead to erroneous results of conversion in single mode.
To perform conversion in single mode in such cases, set ADST to 0, wait for at least the A/D
conversion time for a single channel to elapse, and then start conversion (ADST = 1). The A/D
conversion time for a single channel will vary according to the settings of the ADC registers).
Rev. 2.00 Mar. 14, 2008 Page 1176 of 1824
REJ09B0290-0200