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ADC0833CCN датащи(PDF) 10 Page - National Semiconductor (TI) |
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ADC0833CCN датащи(HTML) 10 Page - National Semiconductor (TI) |
10 / 20 page Functional Description (Continued) Since the input configuration is under software control it can be modified as required at each conversion A channel can be treated as a single-ended ground referenced input for one conversion then it can be reconfigured as part of a differential channel for another conversion Figure 1 illus- trates the input flexibility which can be achieved The analog input voltages for each channel can range from 50 mV below ground to 50mV above VCC(typically 5V) with- out degrading conversion accuracy 20 THE DIGITAL INTERFACE A most important characteristic of these converters is their serial data link with the controlling processor Using a serial communication format offers two very significant system im- provements it allows more function to be included in the converter package with no increase in package size and it can eliminate the transmission of low level analog signals by locating the converter right at the analog sensor transmit- ting highly noise immune digital data back to the host proc- essor To understand the operation of these converters it is best to refer to the Timing Diagram and Functional Block Diagram and to follow a complete conversion sequence 1 A conversion is initiated by first pulling the CS (chip se- lect) line low This line must be held low for the entire con- version The converter is now waiting for a start bit and its MUX assignment word 2 A clock is then generated by the processor (if not provid- ed continuously) and output to the AD clock input 3 On each rising edge of the clock the status of the data in (DI) line is clocked into the MUX address shift register The start bit is the first logic ‘‘1’’ that appears on this line (all leading zeros are ignored) Following the start bit the con- verter expects the next 4 bits to be the MUX assignment word 4 Single-Ended 2 Differential Mixed Mode TLH5607 – 6 FIGURE 1 Analog Input Multiplexer Options for the ADC0833 10 |
Аналогичный номер детали - ADC0833CCN |
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Аналогичное описание - ADC0833CCN |
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