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ADC081S051 View Datasheet(PDF) - National ->Texas Instruments

Part NameDescriptionManufacturer
ADC081S051 Single Channel, 500 kSPS, 8-Bit A/D Converter National-Semiconductor
National ->Texas Instruments National-Semiconductor
ADC081S051 Datasheet PDF : 13 Pages
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Applications Information (Continued)
The output format of the ADC081S051 is straight binary. Code transitions occur midway between successive integer LSB values.
The LSB width for the ADC081S051 is VA/256. The ideal transfer characteristic is shown in Figure 5. The transition from an output
code of 0000 0000 to a code of 0000 0001 is at 1/2 LSB, or a voltage of VA/512. Other code transitions occur at steps of one LSB.
FIGURE 5. Ideal Transfer Characteristic
A typical application of the ADC081S051 is shown in Figure
6. Power is provided in this example by the National Semi-
conductor LP2950 low-dropout voltage regulator, available in
a variety of fixed and adjustable output voltages. The power
supply pin is bypassed with a capacitor network located
close to the ADC081S051. Because the reference for the
ADC081S051 is the supply voltage, any noise on the supply
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 the ADC081S051 supply pin. Because of the
ADC081S051’s low power requirements, it is also possible to
use a precision reference as a power supply to maximize
performance. The four-wire interface is also shown con-
nected to a microprocessor or DSP.
FIGURE 6. Typical Application Circuit
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