ata6603 ATMEL Corporation, ata6603 Datasheet - Page 271

• Manufacturer Part Number: ata6603
• Description: Microcontroller With Lin Transceiver, 5v Regulator And Watchdog
• Manufacturer: ATMEL Corporation

4.21.5.2
4921D–AUTO–08/07
Analog Noise Canceling Techniques
Figure 4-107. Analog Input Circuitry
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:
a. Keep analog signal paths as short as possible. Make sure analog tracks run over
b. The AV
c. Use the ADC noise canceler function to reduce induced noise from the CPU.
d. If any ADC [3..0] port pins are used as digital outputs, it is essential that these do
the analog ground plane, and keep them well away from high-speed switching digi-
tal tracks.
via an LC network as shown in
not switch while a conversion is in progress. However, using the 2-wire Interface
(ADC4 and ADC5) will only affect the conversion on ADC4 and ADC5 and not the
other ADC channels.
ADCn
CC
pin on the device should be connected to the digital V
I
IH
I
IL
Figure 4-108 on page
1..100 kW
ATA6602/ATA6603
272.
C
S/H
= 14 pF
CC
supply voltage
V
CC
/2
271