ADC122S101EVAL National Semiconductor, ADC122S101EVAL Datasheet - Page 17

• Manufacturer Part Number: ADC122S101EVAL
• Description: BOARD EVALUATION FOR ADC122S101
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of ADC122S101EVAL

• Number Of Adc's: 1
• Number Of Bits: 12
• Sampling Rate (per Second): 1M
• Data Interface: Serial
• Inputs Per Adc: 2 Single
• Input Range: 0 ~ 5.25 V
• Power (typ) @ Conditions: 13.1mW @ 1MSPS
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: ADC122S101
• Lead Free Status / RoHS Status: Not applicable / Not applicable

3.0 ADC122S101 TRANSFER FUNCTION
The output format of the ADC122S101 is straight binary.
Code transitions occur midway between successive integer
LSB values. The LSB width for the ADC122S101 is V
4.0 TYPICAL APPLICATION CIRCUIT
A typical application of the ADC122S101 is shown in
Figure
Semiconductor LP2950 low-dropout voltage regulator, avail-
able in a variety of fixed and adjustable output voltages. The
power supply pin is bypassed with a capacitor network locat-
ed close to the ADC122S101. Because the reference for the
ADC122S101 is the supply voltage, any noise on the supply
4. Power is provided, in this example, by the National
FIGURE 3. Ideal Transfer Characteristic
FIGURE 4. Typical Application Circuit
A
/4096.
17
The ideal transfer characteristic is shown in
transition from an output code of 0000 0000 0000 to a code
of 0000 0000 0001 is at 1/2 LSB, or a voltage of V
Other code transitions occur at steps of one LSB.
will degrade device noise performance. To keep noise off the
supply, use a dedicated linear regulator for this device, or
provide sufficient decoupling from other circuitry to keep noise
off
ADC122S101's low power requirements, it is also possible to
use a precision reference as a power supply to maximize per-
formance. The four-wire interface is shown connected to a
microprocessor or DSP.
the
ADC122S101
20125211
supply
20125213
pin.
Because
Figure
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of
A
3. The
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the