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ADC0844 датащи(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
номер детали ADC0844
подробное описание детали  8-Bit uP Compatible A/D Converters with Multiplexer Options
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

ADC0844 датащи(HTML) 11 Page - National Semiconductor (TI)

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Applications Information (Continued)
TABLE 2. ADC0848 MUX Addressing
MUX Address
CS
WR
RD
Channel
MUX
MA4
MA3
MA2
MA1
MA0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CH8 AGND
Mode
X
LLLL
L
H
+
X
LLL
H
L
H
+
X
L
LHL
L
H
+
XL
L
H
H
L
L
H
+
Differential
X
LHL
L
L
H
+
X
LHLH
L
H
+
XL
H
H
L
L
H
+
X
L
HHH
L
H
+
L
H
LLL
L
H
+
LHL
LH
L
H
+
LHLHL
L
H
+
LHLH
H
L
L
H
+
Single-Ended
LH
HL
L
L
H
+
LH
HLH
L
H
+
L
HHH
L
L
H
+
L
HHHH
L
H
+
H
H
LLL
L
H
+
HH
L
L
H
L
H
+
H
HLHL
L
H
+
Pseudo-
H
HLH
H
L
L
H
+
Differential
HHH
L
L
L
H
+
H
H
HLH
L
H
+
HHHH
L
L
H
+
XXXXX
L
L
L
Previous Channel Configuration
3.2 Input Current
Due to the sampling nature of the analog inputs, short dura-
tion spikes of current enter the “+” input and exit the “−” input
at the clock edges during the actual conversion. These cur-
rents decay rapidly and do not cause errors as the internal
comparator is strobed at the end of a clock period. Bypass
capacitors at the inputs will average these currents and
cause an effective DC current to flow through the output re-
sistance of the analog signal source. Bypass capacitors
should not be used if the source resistance is greater than
1k
Ω.
3.3 Input Source Resistance
The limitation of the input source resistance due to the DC
leakage currents of the input multiplexer is important. A
worst-case leakage current of ± 1 µA over temperature will
createa1mV input error witha1k
Ω source resistance. An
op amp RC active low pass filter can provide both imped-
ance buffering and noise filtering should a high impedance
signal source be required.
4.0 OPTIONAL ADJUSTMENTS
4.1 Zero Error
The zero of the A/D does not require adjustment. If the mini-
mum analog input voltage value, V
IN(MIN), is not ground, a
zero offset can be done. The converter can be made to out-
put 0000 0000 digital code for this minimum input voltage by
biasing any V
IN (−) input at this VIN(MIN) value. This is useful
for either differential or pseudo-differential modes of input
channel configuration.
The zero error of the A/D converter relates to the location of
the first riser of the transfer function and can be measured by
grounding the V
input and applying a small magnitude posi-
tive voltage to the V
+ input. Zero error is the difference be-
tween actual DC input voltage which is necessary to just
cause an output digital code transition from 0000 0000 to
0000 0001 and the ideal 12 LSB value (12 LSB=9.8 mV for
V
REF=5.000 VDC).
4.2 Full-Scale
The full-scale adjustment can be made by applying a differ-
ential input voltage which is 1 12 LSB down from the desired
analog full-scale voltage range and then adjusting the mag-
nitude of the V
REF input for a digital output code changing
from 1111 1110 to 1111 1111.
4.3 Adjusting for an Arbitrary Analog Input Voltage
Range
If the analog zero voltage of the A/D is shifted away from
ground (for example, to accommodate an analog input signal
which does not go to ground), this new zero reference
should be properly adjusted first. A V
IN (+) voltage which
equals this desired zero reference plus 12 LSB (where the
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11


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logo
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logo
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