参数资料
型号: ADC0800PCD
厂商: NATIONAL SEMICONDUCTOR CORP
元件分类: ADC
英文描述: ADC0800 8-Bit A/D Converter
中文描述: 1-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, CDIP18
封装: HERMETIC SEALED, DIP-18
文件页数: 7/10页
文件大小: 166K
代理商: ADC0800PCD
Typical Applications
(Continued)
TESTING THE A/D CONVERTER
There are many degrees of complexity associated with test-
ing an A/D converter. One of the simplest tests is to apply a
known analog input voltage to the converter and use LEDs
to display the resulting digital output code as shown in Fig-
ure 3. Note that the LED drivers invert the digital output of
the A/D converter to provide a binary display. A lab DVM
can be used if a precision voltage source is not available.
After adjusting the zero and full-scale, any number of points
can be checked, as desired.
For ease of testing, a 10.24 V
DC
reference is recommended
for the A/D converter. This provides an LSB of 40 mV
(10.240/256). To adjust the zero of the A/D, an analog input
voltage of
(/2
LSB or 20 mV should be applied and the
zero adjust potentiometer should be set to provide a flicker
on the LSB LED readout with all the other display LEDs
OFF.
To adjust the full-scale adjust potentiometer, an analog in-
put that is 1
(/2
LSB less than the reference (10.240–0.060
or 10.180 V
DC
) should be applied to the analog input and
the full-scale adjusted for a flicker on the LSB LED, but this
time with all the other LEDs ON.
A complete circuit for a simple A/D tester is shown inFigure
4. Note that the clock input voltage swing and the digital
output voltage swings are from 0V to 10.24V. The
MM74C901 provides a voltage translation to 5V operation
and also the logic inversion so the readout LEDs are in bina-
ry.
TL/H/5670–15
FIGURE 3. Basic A/D Tester
TL/H/5670–7
FIGURE 4. Complete Basic Tester Circuit
7
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