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Giải thích chi tiết về linh kiện  Successive Approximation Registers
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MC14549B, MC14559B
http://onsemi.com
7
Q7 Q6 Q5
MR
SC
C
Sout
MC14549B
Q4 Q3 Q2 Q1 Q0 EOC
Sout
TO DAC
Q7 Q6 Q5
SC
CSout
MC14559B
Q4 Q3 Q2 Q1 Q0
EOC
TO DAC
FF
EOC
Figure 4. Continuously Cycling 12−Bit ADC
Externally Controlled 12−Bit ADC (Figure 5)
In this circuit the external pulse starts the first SAR and
simultaneously resets the cascaded second SAR. When Q4 of
the first SAR goes high, the second SAR starts conversion,
and the first one stops conversion. EOC indicates that the
parallel data are valid and that the serial output is complete.
Updating the output data is started with every external control
pulse.
Additional Motorola Parts for Successive
Approximation ADC
Monolithic digital−to−analog converters — The
MC1408/1508 converter has eight−bit resolution and is
available
with
6,
7,
and
8−bit
accuracy.
The
amplifier−comparator block — The MC1407/1507
contains a high speed operational amplifier and a high speed
comparator with adjustable window.
With these two linear parts it is possible to construct
SA−ADCs with an accuracy of up to eight bits, using as the
register one MC14549B or one MC14559B. An additional
CMOS block will be necessary to generate the clock
frequency.
Additional information on successive approximation ADC
is found in Motorola Application Note AN−716.
Figure 5. Externally Controlled 12−Bit ADC
Q7 Q6 Q5
MR
SC
C
Sout
MC14549B
Q4 Q3 Q2 Q1 Q0 EOC
Sout
TO DAC
Q7 Q6 Q5
SC
CSout
MC14559B
Q4 Q3 Q2 Q1 Q0
EOC
TO DAC
FF
EOC


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