28129 Parallax Inc, 28129 Datasheet - Page 94
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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The reason for this goes back to Ohm's Law: V = I x R (voltage equals current multiplied
by resistance). Each BASIC Stamp I/O pin can supply up to 20 mA of current. In the case
of the resistive ladder network without the buffer, the BASIC Stamp I/O pins reached
their maximum current output. Meanwhile, the resistance seen by the I/O pins stayed
about the same. In other words, I x R reached a limit because I (the current) could no
longer increase, and R is a fixed value. So the output voltage is equal to a current value
that can't get any higher multiplied by a fixed resistance. This is why the voltage stops
increasing.
Aside from isolating two circuits from each other, an op-amp in voltage follower
configuration can typically supply more current than the circuit connected to its input.
The name buffer is commonly used when a voltage follower is used to supply extra
current.
The circuit from Figure 4-8 will also be used at the beginning of Chapter #5, so do not
disassemble the circuit after completing Chapter #4.
Decimal
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
Table 4-2:D/A Converter Output with Buffer
Binary
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
DVM (Volts)
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