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ADC0811 데이터시트(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 ADC0811
상세설명  8-Bit Serial I/O A/D Converter With 11-Channel Multiplexer
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

ADC0811 데이터시트(HTML) 10 Page - National Semiconductor (TI)

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Functional Description (Continued)
at least 64 w2 clocks to insure that the AD has completed
its conversion If SCLK is enabled sooner synchronizing to
the data output on DO is not possible since an end of con-
version signal from the AD is not available and the actual
conversion time is not known With CS low during the con-
version time (64 w2 max) DO will go low after the eighth
falling edge of SCLK and remain low until the conversion is
completed Once the conversion is through DO will transmit
the MSB The rest of the data will be shifted out once SCLK
is enabled as discussed previously
If CS goes high during the conversion sequence DO is tri-
stated and the result is not affected so long as CS remains
high until the end of the conversion
12 MULTIPLEXER ADDRESSING
The four bit mux address is shifted MSB first into DI Input
data corresponds to the channel selected as shown in table
1 Care should be taken not to send an address greater than
or equal to twelve (11XX) as this puts the AD in a digital
testing mode In this mode the analog inputs CH0 thru CH3
become digital outputs for our use in production testing
20 ANALOG INPUT
21 THE INPUT SAMPLE AND HOLD
The ADC0811’s samplehold capacitor is implemented in its
capacitive ladder structure After the channel address is re-
ceived the ladder is switched to sample the proper analog
input This sampling mode is maintained for 1 msec after the
eighth SCLK falling edge The hold mode is initiated with the
start of the conversion process An acquisition window of
4tSCLKa1 msec is therefore available to allow the ladder
capacitance to settle to the analog input voltage Any
change in the analog voltage before or after the acquisition
window will not effect the AD conversion result
In the most simple case the ladder’s acquisition time is de-
termined by the Ron (3K) of the multiplexer switches and the
total ladder capacitance (90pf) These values yield an acqui-
sition time of about 2 msec for a full scale reading There-
fore the analog input must be stable for at least 2 msec
before and 1 msec after the eighth SCLK falling edge to
ensure a proper conversion External input source resist-
ance and capacitance will lengthen the acquisition time and
should be accounted for
Other conventional sample and hold error specifications are
included in the error and timing specs of the AD The hold
step and gain error samplehold specs are taken into ac-
count in the ADC0811’s total unadjusted error while the
hold settling time is included in the AD’s max conversion
time of 64 w2 clock periods The hold droop rate can be
thought of as being zero since an unlimited amount of time
can pass between a conversion and the reading of data
However once the data is read it is lost and another conver-
sion is started
Typical Applications
ADC0811-INS8048 INTERFACE
TLH5587 – 21
10


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