28129 Parallax Inc, 28129 Datasheet - Page 91
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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increases. Third, the largest error is 0.1 volts. This kind of data can be exceedingly useful
in electronics design, and the automated testing process is a huge time saver.
The Voltage Follower
Let's use the voltage sweep to analyze what happens when the output of the D/A
converter is connected to another circuit. We'll use the output of the D/A converter to
drive an LED circuit. First we'll connect the D/A converter output directly to the input of
the LED circuit. Then we'll use the voltage follower as an intermediate step between the
D/A converter output and the LED circuit input.
P0
P1
P2
1
7
6
Vdd
/CS
CLK
D0
ADC0831
8
Vref
Vdd
Vin(+)
5
GND
Vin(-)
Figure 4-7 D/A Circuit without a Buffer.
2
4
3
Vss
P7
P6
P5
P4
2 k
2 k
2 k
2 k
Ω
Ω
Ω
Ω
Vss
1 k
1 k
1 k
2 k
Ω
Ω
Ω
Ω
Vss
2 k
Ω
Vss
270
LED
Ω
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