28129 Parallax Inc, 28129 Datasheet - Page 53

• Manufacturer Part Number: 28129
• Description: TEXT BASIC ANALOG & DIGITAL
• Manufacturer: Parallax Inc
• Type: Programmingr

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

The ADC0831 Integrated Circuit - An 8-bit Analog to Digital Converter
The ADC0831 is an integrated circuit referred to as an 8-bit analog to digital converter
(A/D converter) with synchronous serial output. Let's look at what each of these terms
mean:
The BASIC Stamp will be programmed to read and store the 8-serial-bits transmitted by
the ADC0831. We’ll also program the BASIC Stamp to display the decimal equivalent of
the binary output. Next, we’ll use this decimal equivalent to calculate and displays the
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An integrated circuit (IC) is a circuit with microscopic components implanted on
the surface of a silicon wafer. The Analog and Digital Parts Kit has three chips
used in these experiments. Each chip is a black casing with eight pins. The black
casing houses and protects an integrated circuit.
An A/D converter measures an analog voltage sample and returns a binary
number that describes the sample.
8-bit is the number of binary digits the ADC0831 uses to describe the analog
voltage it samples. 8-bit is also the resolution of the A/D converter. You can
count from 0 to 255 (decimal) using an 8-bit binary number. This means that the
ADC0831 can approximate the voltage it measures as one of 256 levels. A
higher resolution converter, such as 12-bit, would break the same voltage range
into 4096 levels because you can count from 0 to 4095 with 12 binary bits.
Synchronous and serial are terms we learned about in Chapter #2. We sent serial
binary digits (bits) to the BASIC Stamp using one pushbutton and the bits were
synchronized to a second pushbutton that was used to send a clock signal. The
ADC0831 works in a similar way. The difference is that the ADC0831 depends
on a clock signal sent by the BASIC Stamp to time the sending of each serial
output bit.
Resistors in Series: A chain of resistors connected end to end. Three resistors in series
are shown below. The three resistors can be viewed as a single resistance whose value is:
R
R1
series
=R
R2
1
+R
2
+R
R3
3