ADC0816, ADC0817

www.ti.com

SNAS527C – JUNE 1999 – REVISED MARCH 2013

Figure 9. Ratiometric Conversion System

The ADC0816 needs less than a milliamp of supply current so developing the supply from the reference is

readily accomplished. In Figure 11 a ground references 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 12. The LM301 is overcompensated to insure stability when loaded by the 10

μF output

capacitor.

supply. The sensitivity of the converter can be increased, (i.e., size of the LSB steps decreased) by using a

same current flows in identical resistors. This system with a 2.5V reference allows the LSB to be half the size of

the LSB in a 5V reference system.

Figure 10. Ground Referenced Conversion System Using Trimmed Supply

Copyright © 1999–2013, Texas Instruments Incorporated

Submit Documentation Feedback

11

Product Folder Links: ADC0816 ADC0817