28129 Parallax Inc, 28129 Datasheet - Page 136
28129
Manufacturer Part Number
28129
Description
TEXT BASIC ANALOG & DIGITAL
Manufacturer
Parallax Inc
Type
Programmingr
Datasheet
1.28129.pdf
(176 pages)
Specifications of 28129
Style
Book
Title
Basic Analog and Digital
Contents
Basic Analog and Digital Text
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Not applicable / Not applicable
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Applying many narrow pulses as opposed to the single very wide pulse applied in Figure
7-3 has advantages in terms of accuracy. As you will soon find out, this D/A conversion
technique is surprisingly accurate - especially compared to the accuracy of the parts used
to make the conversion. The resistor has a 10% tolerance and the capacitor is only
accurate to 20%!
Parts Required
This experiment requires the following parts:
(1) ADC0831 A/D converter
(1) LM358 op-amp
(2) 10 k resistor
(1) 1.0 µF electrolytic capacitor
(1) Photoresistor
(1) 470
(1) Yellow LED
Voltage
Voltage
Output
(Volts)
(Volts)
Input
resistor
5
4
3
2
1
0
-0.02
5
4
3
2
1
0
-0.02
-0.01
-0.01
0
0
0.01
0.01
0.02
0.02
0.03
0.03
Time, (Seconds)
0.04
0.04
0.05
0.05
Figure 7-3
RC circuit Step
Response
Shows the
voltage response
to a single
voltage step
applied at the
input.
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