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AT90PWM2 Datasheet(PDF) 251 Page - ATMEL Corporation

Part # AT90PWM2
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
PDF  365 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90PWM2 Datasheet(HTML) 251 Page - ATMEL Corporation

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251
AT90PWM2/3
4317B–AVR–02/05
Figure 122. 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
CC pin on the device should be connected to the digital VCC supply
voltage via an LC network as shown in Figure 123.
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.
Figure 123. ADC Power Connections
Offset Compensation
Schemes
The gain stage has a built-in offset cancellation circuitry that nulls the offset of differen-
tial measurements as much as possible. The remaining offset in the analog path can be
measured directly by shortening both differential inputs using the AMPxIS bit with both
inputs unconnected. (See “Amplifier 0 Control and Status register – AMP0CSR” on page
ADCn
IIH
1..100 k
Ω
CS/H= 14 pF
VCC/2
IIL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
VCC
GND
(ADC0) PE2
(ADC1) PD4
PB7(ADC4)
PB6 (ADC7)
PB5 (ADC6)
PC7 (D2A)
PB4 (AMP0+)
PB3 (AMP0-)
PC6 (ADC10/ACMP1)
AREF
AGND
AVCC
PC5 (ADC9/AMP1+)
PC4 (ADC8/AMP1-)
PB2 (ADC5)
PD7 (ACMP0)
PD6 (ADC3/ACMPM)
PD5 (ADC2/ACMP2)
100nF
Analog Ground Plane
10
µH



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