28129 Parallax Inc, 28129 Datasheet - Page 93
![TEXT BASIC ANALOG & DIGITAL](/photos/6/49/64954/mfg_28129_sml.jpg)
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
- Current page: 93 of 176
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Comparing the two tables, it should be fairly clear that the buffer (voltage follower)
eliminated a problem caused by connecting the LED circuit directly to the D/A
converter's output. The voltage of the D/A output without a buffer reached a maximum
well below the D/A converter's 3 volt maximum. On the other hand, the buffered output
went all the way to 3 volts with no problem.
P0
P1
P2
1
7
6
Vdd
/CS
CLK
D0
ADC0831
8
Vdd
Vref
5
Vin(+)
GND
Vin(-)
2
4
3
Figure 4-8 D/A Circuit With a Buffer
Vss
P7
P6
P5
P4
2
2
2
2
kΩ
kΩ
kΩ
kΩ
Vss
1
1
1
2
kΩ
kΩ
kΩ
kΩ
Vss
LM358
2
kΩ
Vdd
A
Vss
270
LED
Ω
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