SH7261 datasheet(1068/1348 Pages) RENESAS

Part #	SH7261

Description	32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

PDF	1348 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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1068 / 1348 page

Section 22 A/D Converter (ADC)

Rev. 2.00 Sep. 07, 2007 Page 1036 of 1312

REJ09B0320-0200

Sensor input

This LSI

Sensor output impedance

Low-pass filter

C to 0.1

µF

Up to 5 k

Ω

Cin =

15 pF

20 pF

3 k

Ω

Note: Values are reference values.

A/D converter

equivalent circuit

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

Usage Note when Shifting to Single Mode during A/D Conversion

During the A/D conversion in scan mode or multi mode, if the A/D conversion is stopped by

clearing the A/D start bit (ADST) in ADCSR to 0 and restarted after a transition to single mode,

make sure to set ASDT to 1 after the time required for one-channel A/D conversion has elapsed.

SH7261 Datasheet(PDF) 1068 Page - Renesas Technology Corp