Using_the_referenc_as_the_supply

Published:2009/7/25 4:38:00 Author:Jessie | From:SeekIC

Figure 9-6 shows the ADC0816/17 connected with the external reference used asthe supply． The LM336-5.0 provides regulated 5-V for the ADC power andreference inputs as well as for the power input of other components in the system Of course an unregulated supply greater than 5 V is required for V+ Seriesresistor R is chosen so that the maximum current needed by the system is supplied and the LM336－5.0 is kept in regulation，The value of R is found by∶ where VS＝unregulated supply voltage； VREF＝reference voltage； ILAD ＝VREF/1 kΩ resistor ladder current; ITR ＝transducer currents IP＝system power supply requirements; and IR ＝ minimum reference current．NATIONAL SEMICONDUCTOR APPLICATION NOTE 258. 1994, P. 594.



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