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MC14549B データシート(PDF) 7 Page - ON Semiconductor

部品番号 MC14549B
部品情報  Successive Approximation Registers
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MC14549B データシート(HTML) 7 Page - ON Semiconductor

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MC14549B, MC14559B
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7
TYPICAL APPLICATIONS
Externally Controlled 6–Bit ADC (Figure 2)
Several features are shown in this application:
• Shortening of the register to six bits by feeding the
seventh output bit into the FF input.
• Continuous conversion, if a continuous signal is applied
to SC.
• Externally controlled updating (the start pulse must be
shorter than the conversion cycle).
• The EOC output indicating that the parallel data are valid
and that the serial output is complete.
Continuously Cycling 8–Bit ADC (Figure 3)
This ADC is running continuously because the EOC
signal is fed back to the SC input, immediately initiating a
new cycle on the next clock pulse.
Continuously Cycling 12–Bit ADC (Figure 4)
Because each successive approximation register (SAR)
has a capability of handling only an eight–bit word, two
must be cascaded to make an ADC with more than eight bits.
When it is necessary to cascade two SAR’s, the second
SAR must have a stable resettable state to remain in while
awaiting a subsequent start signal. However, the first stage
must not have a stable resettable state while recycling,
because during switch–on or due to outside influences, the
first stage has entered a reset state, the entire ADC will
remain in a stable non–functional condition.
This 12–bit ADC is continuously recycling. The serial as
well as the parallel outputs are updated every thirteenth
clock pulse. The EOC pulse indicates the completion of the
12–bit conversion cycle, the end of the serial output word,
and the validity of the parallel data output.
Figure 2. Externally Controlled 6–Bit ADC
TO DAC
SC
C
Sout
Q7 Q6 Q5
MC14559B
Q4 Q3 Q2 Q1 Q0
EOC
FF
Figure 3. Continuously Cycling 8–Bit ADC
TO DAC
SC
C
Sout
Q7 Q6 Q5
MC14559B
Q4 Q3 Q2 Q1 Q0
EOC
FF


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