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ADC0804LCWM Datasheet(PDF) 31 Page - Texas Instruments |
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ADC0804LCWM Datasheet(HTML) 31 Page - Texas Instruments |
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31 / 56 page  ADC0801, ADC0802, ADC0803, ADC0804, ADC0805 www.ti.com SNOSBI1C – NOVEMBER 2009 – REVISED JUNE 2015 All the converters are started simultaneously with a STORE instruction at HEX address 5000. Note any other HEX address of the form 5XXX will be decoded by the circuit, pulling all the CS inputs low. This can easily be avoided by using a more definitive address decoding scheme. All the interrupts are ORed together to insure that all ADCs have completed their conversion before the microprocessor is interrupted. The subroutine, DATA IN, may be called from anywhere in the user’s program. Once called, this routine initializes the CPU, starts all the converters simultaneously and waits for the interrupt signal. Upon receiving the interrupt, it reads the converters (from HEX addresses 5000 through 5007) and stores the data successively at (arbitrarily chosen) HEX addresses 0200 to 0207, before returning to the user’s pro- gram. All CPU registers then recover the original data they had before servicing DATA IN. 9.2.3 Auto-Zeroed Differential Transducer Amplifier and ADC Converter The differential inputs of the ADC0801 series eliminate the need to perform a differential to single ended conversion for a differential transducer. Thus, one op amp can be eliminated because the differential to single ended conversion is provided by the differential input of the ADC0801 series. In general, a transducer preamp is required to take advantage of the full ADC converter input dynamic range. *Numbers in parentheses refer to MC6800 CPU pin out. **Numbers of letters in brackets refer to standard M6800 system common bus code. Figure 40. Interfacing Multiple ADCs in an MC6800 System Copyright © 2009–2015, Texas Instruments Incorporated Submit Documentation Feedback 31 Product Folder Links: ADC0801 ADC0802 ADC0803 ADC0804 ADC0805 |
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