28176 Parallax Inc, 28176 Datasheet - Page 203
28176
Manufacturer Part Number
28176
Description
KIT PARTS PROCESS CONTROL W/TEXT
Manufacturer
Parallax Inc
Datasheet
1.122-28176.pdf
(330 pages)
Specifications of 28176
Accessory Type
Process Control
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
BASIC Stamp® 2 and Board of Education
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
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With no gain, or actually a gain of 1 or unity gain, the voltage to the ADC is the voltage
sensed at the ADC. When the op-amp is used with a gain of 4, an input voltage of 1.25 V
will provide 5 V to the ADC. Note the slope of the line:
The slope of the line is also the gain, giving a line equation of:
What is the resolution of the circuit now? In comparing the applied voltage to the bit
count: 1.25 V/255 = 0.0049 V/bit value. In terms of temperature:
...which is 4 times the resolution previously measured.
m = ∆Output/∆Input = (5−0)/(1.25−0) = 5/1.25 = 4
VADC = 4(ADC-IN) + 0
125 °F/255 = .49 °F/bit value
Figure 6-8
Vin vs. ADC
Voltages
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