ADC0852

ADC0852 ADC0854 Multiplexed Comparator with 8-Bit Reference Divider April 1995 ADC0852 ADC0854 Multiplexed Comparator with 8-Bit Reference Divider General Description The ADC0852 and ADC0854 are CMOS devices that combine a versatile analog input multiplexer voltage comparator and an 8-bit DAC which provides the comparator’s threshold voltage (VTH) The comparator provides a ‘‘1-bit’’ output as a result of a comparison between the analog input and the DAC’s output This allows for easy implementation of set-point on-off or ‘‘bang-bang’’ control systems with several advantages over previous devices The ADC0854 has a 4 input multiplexer that can be software configured for single ended pseudo-differential and full-differential modes of operation In addition the DAC’s reference input is brought out to allow for reduction of the span The ADC0852 has a two input multiplexer that can be configured as 2 single-ended or 1 differential input pair The DAC reference input is internally tied to VCC The multiplexer and 8-bit DAC are programmed via a serial data input word Once programmed the output is updated once each clock cycle up to a maximum clock rate of 400 kHz Features Y Y Y Y Y Y 2 or 4 channel multiplexer Differential or Single-ended input software controlled Serial digital data interface 256 programmable reference voltage levels Continuous comparison after programming Fixed ratiometric or reduced span reference capability (ADC 0854) Key Specifications Y Y Y Accuracy g LSB or ...