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ADC0809CCV 数据表(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件名 ADC0809CCV
功能描述  8-Bit uP Compatible A/D Converters with 8-Channel Multiplexer
Download  14 Pages
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

ADC0809CCV 数据表(HTML) 8 Page - National Semiconductor (TI)

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Typical Performance Characteristics
TRI-STATE Test Circuits and Timing Diagrams
Applications Information
OPERATION
1.0 RATIOMETRIC CONVERSION
The ADC0808, ADC0809 is designed as a complete Data
Acquisition System (DAS) for ratiometric conversion sys-
tems. In ratiometric systems, the physical variable being
measured is expressed as a percentage of full-scale which is
not necessarily related to an absolute standard. The voltage
input to the ADC0808 is expressed by the equation
(1)
V
IN=Input voltage into the ADC0808
V
fs=Full-scale voltage
V
Z=Zero voltage
D
X=Data point being measured
D
MAX=Maximum data limit
D
MIN=Minimum data limit
A good example of a ratiometric transducer is a potentiom-
eter used as a position sensor. The position of the wiper is di-
rectly proportional to the output voltage which is a ratio of the
full-scale voltage across it. Since the data is represented as
a proportion of full-scale, reference requirements are greatly
reduced, eliminating a large source of error and cost for
many applications. A major advantage of the ADC0808,
ADC0809 is that the input voltage range is equal to the sup-
ply range so the transducers can be connected directly
across the supply and their outputs connected directly into
the multiplexer inputs, (
Figure 9).
Ratiometric transducers such as potentiometers, strain
gauges, thermistor bridges, pressure transducers, etc., are
suitable for measuring proportional relationships; however,
many types of measurements must be referred to an abso-
lute standard such as voltage or current. This means a sys-
DS005672-16
FIGURE 6. Comparator I
IN vs VIN
(V
CC=VREF=5V)
DS005672-17
FIGURE 7. Multiplexer R
ON vs VIN
(V
CC=VREF=5V)
t
1H,tH1
DS005672-18
t
1H,CL = 10 pF
DS005672-19
t
H1,CL = 50 pF
DS005672-20
t
0H,tH0
DS005672-21
t
0H,CL = 10 pF
DS005672-22
t
H0,CL = 50 pF
DS005672-23
FIGURE 8.
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8


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