28128 Parallax Inc, 28128 Datasheet - Page 78
28128
Manufacturer Part Number
28128
Description
KIT BASIC ANALOG/DIGI PARTS ONLY
Manufacturer
Parallax Inc
Datasheet
1.28129.pdf
(176 pages)
Specifications of 28128
Accessory Type
ADC, DAC
Product
Microcontroller Accessories
For Use With/related Products
BASIC Stamp® 2 and Board of Education
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Page 68 · Basic Analog and Digital
Stamp to send the resistive ladder network sets of binary voltage levels. These sets of
binary voltages are converted by the resistive ladder network to discrete output voltages.
The DVM from Chapter #3 will be used to measure the converter's output voltages.
Measuring all the D/A converter's output levels is called a voltage sweep. We will use
PBASIC to automate our DVM to perform the entire voltage sweep. That way, the D/A
converter's output voltages can be measured without manually repeating each
measurement.
Parts Required
Gather these parts from your parts kit and let's get started:
(6) 2 k resistors
(3) 1 k resistors
(1) ADC0831 A/D Converter
(1) Red LED
(1) 270
resistor
(1) LM 358 op-amp
The resistive ladder network for this experiment is shown in shown in Figure 4-1. The
name comes from the fact that the resistor network in the schematic resembles a ladder.
It's definitely an inexpensive alternative compared to an integrated circuit digital to
analog converter (D/A converter or DAC). A few resistors are a fraction of the cost of an
integrated circuit.
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