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ADC0809-N Datasheet(PDF) 11 Page - Texas Instruments

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No. de pieza ADC0809-N
Descripción Electrónicos  ADC0808/ADC0809 8-Bit 關P Compatible A/D Converters with 8-Channel Multiplexer
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Fabricante Electrónico  TI1 [Texas Instruments]
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ADC0808-N, ADC0809-N
www.ti.com
SNAS535H – OCTOBER 1999 – REVISED MARCH 2013
The ADC0808 needs less than a milliamp of supply current so developing the supply from the reference is
readily accomplished. In Figure 13 a ground referenced system is shown which generates the supply from the
reference. The buffer shown can be an op amp of sufficient drive to supply the milliamp of supply current and the
desired bus drive, or if a capacitive bus is driven by the outputs a large capacitor will supply the transient supply
current as seen in Figure 14. The LM301 is overcompensated to insure stability when loaded by the 10
μF output
capacitor.
The top and bottom ladder voltages cannot exceed VCC and ground, respectively, but they can be symmetrically
less than VCC and greater than ground. The center of the ladder voltage should always be near the center of the
supply. The sensitivity of the converter can be increased, (i.e., size of the LSB steps decreased) by using a
symmetrical reference system. In Figure 15, a 2.5V reference is symmetrically centered about VCC/2 since the
same current flows in identical resistors. This system with a 2.5V reference allows the LSB bit to be half the size
of a 5V reference system.
Figure 12. Ground Referenced
Conversion System Using Trimmed Supply
Figure 13. Ground Referenced Conversion System with
Reference Generating VCC Supply
Copyright © 1999–2013, Texas Instruments Incorporated
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