Rainbow-electronics ATmega64L Bedienungsanleitung PDF herunterladen (Seite 204)

100

101

204

ATmega16(L)

2466B–09/01

Figure 105. Analog Input Circuitry

Analog Noise Canceling

Techniques

Digital circuitry inside and outside the device generates EMI which might affect the

accuracy of analog measurements. If conversion accuracy is critical, the noise level can

be reduced by applying the following techniques:

1. Keep analog signal paths as short as possible. Make sure analog tracks run

over the analog ground plane, and keep them well away from high-speed

switching digital tracks.

2. The AV

pin on the device should be connected to the digital V

supply

voltage via an LC network as shown in Figure 106.

3. Use the ADC noise canceler function to reduce induced noise from the CPU.

4. If any ADC port pins are used as digital outputs, it is essential that these do

not switch while a conversion is in progress.

ADCn

1..100 kΩ

S/H

= 14 pF

1 2 ... 199 200 201 202 203 204 205 206 207 208 209 ... 297 298

Kommentare zu diesen Handbüchern

Keine Kommentare

Rainbow-electronics ATmega64L Bedienungsanleitung Seite 204

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Sensoren Rainbow-electronics ATmega64L