ADC1121_15 Datasheet, PDF (3/6 Pages) Analog Devices – LOW POWER ANALOG TO DIGITIAL CONVERTER

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74
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MAX
52
50
56
8
9
10 11 12 13 14 15
- LOGIC SUPPLY VOLTAGE VDD
Conversion Time Vs. Logic Supply Voltage
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Applyingthe ADC1121
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ANALOGSUPPLY@+12V
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THROUGHPUT
- RATE
Hz
OBSOLETE 70
60
50
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Power Consumption Vs. Throughput Rate
and Supply Voltages
100
90
80
0:: 70
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- ANALOG SUPPLY VOLTAGE Volts
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Analog Circuits Power Consumption
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8
9
10 11
12
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LOGIC SUPPLYVOLTAGE- VDD
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Logic Circuits Power Consumption
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sel
ANALOG INPUT CHARACTERISTICS
sary to provide the comparator with a 0 to +5V input which is
The input circuit of the ADCl121 is shown below in block
then compared to the 0 to +5V D/ A converter output. Table I,
diagram form.
below, shows the range programming connections required for
the various input ranges and also shows the resulting input
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impedances.
68 ANALOG INPUT
Cl
l00kil
67 B
l00kil
RANGE
INPUT
CONNECTIONS
INPUT
PROGRAM
66 A _}
RANGE
PIN 66 TO: PIN 67 TO: IMPEDANCE
STt
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65 ANALOG GROUND
r
64 REFERENCE OUTPUT
0 to +5V
68
0 to +10V
65
:t5V
64
:tlOV
64
68
500kil min
68
180kil min
68
180kll min
65
150kll min
--
FROM
REFERENCE
SOURCE
n
Table I. Range Programming
ro;
th
Figure 2. Analog Input Configuration
PARALLEL DATA OUTPUTS
pu
Analog signals in the range of 0 to +5V, 0 to +10V, :t5V, or
TheADC1l21 produces natural binary coded outputs when
In!
IS
:t10V are applied between pins 68 and 65. The range program-
configured as a unipolar device; as a bipolar device it can pro-
51
ming circuitry serves to offset and divide these signals as neces- duce either offset binary or two's complement output codes.
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