SH7014 datasheet(451/754 Pages) RENESAS

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14. Mid-Speed A/D Converter

⎯ SH7016, SH7017 ⎯

Rev.5.00 Sep. 27, 2007 Page 417 of 716

REJ09B0398-0500

14.7

Usage Notes

The following points should be noted when using the mid-speed A/D converter.

14.7.1

Analog Voltage Settings

(1) Analog input voltage range

The voltage applied to analog input pins during A/D conversion should be in the range AV

SS ≤

ANn

≤ AV

CC (n = 0 to 7).

(2) AV

CC and AVSS input voltages

For the AV

CC and AVSS input voltages, set AVCC = VCC = 5V ±10% and AVSS = VSS. When the

mid-speed A/D converter is not used, set AV

CC = VCC and AVSS = VSS.

14.7.2

Handling of Analog Input Pins

To prevent damage from surges and other abnormal voltages at the analog input pins (AN0 to

AN7), connect a protection circuit such as that shown in figure 14.8. This circuit also includes a

CR filter function that suppresses error due to noise. The circuit shown here is only a design

example; circuit constants must be decided on the basis of the actual operating conditions.

Figure 14.9 shows an equivalent circuit for the analog input pins, and table 14.6 summarizes the

analog input pin specifications.

AN0 to AN7

AVSS

SH7016

SH7017

Note: *

μF

0.01

μF

0.1

μF

100

Figure 14.8 Example of Analog Input Pin Protection Circuit

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