Multiplexed Comparator
Description
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 g 1 LSB of Reference (0 2%) Single 5V power supply Low Power 15 mW
TL H 5521 – 1
FIGURE 1 ADC0854 Simplified Block Diagram (ADC0852 has 2 input channels COM tied to GND VREF tied to VCC V a omitted and one GND connection) 2 Channel and 4 Channel Pin Out ADC0852 2-CHANNEL MUX Dual-In-Line Package ADC0854 4-CHANNEL MUX Dual-In-Line Package
TL H 5521 – 10
Top View
AGND and COM internally connected to GND VREF internally connected to VCC
TL H 5521 – 11
Order Number ADC0852 See NS Package Number...
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