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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC1290BCSW датащи(PDF) 27 Page - Linear Technology |
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LTC1290BCSW датащи(HTML) 27 Page - Linear Technology |
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27 / 32 page  27 LTC1290 1290fe S APPLICATI TYPICAL SNEAK-A-BIT TM The LTC1290’s unique ability to software select the polar- ity of the differential inputs and the output word length is used to achieve one more bit of resolution. Using the circuit below with two conversions and some software, a 2’s complement 12-bit + sign word is returned to memory inside the MPU. The MC68HC05C4 was chosen as an example, however, any processor could be used. Two 12-bit unipolar conversions are performed: the first over a 0V to 5V span and the second over a 0V to –5V span (by reversing the polarity of the inputs). The sign of the input is determined by which of the two spans contained it. Then the resulting number (ranging from –4095 to +4095 decimal) is converted to 2’s complement notation and stored in RAM. SNEAK-A-BIT Circuit 1290 TA04 22 µF LT1021-5 MC68HC05C4 SCLK MOSI MISO CO –5V 0.1 µF 2MHz CLOCK OTHER CHANNELS OR SNEAK-A-BIT INPUTS VIN –5V TO 5V LTC1290 CHO CH1 CH2 CH3 CH4 CH5 CH6 CH7 COM DGND VCC ACLK SCLK DIN DOUT CS REF+ REF– V– AGND 9V 5V 1ST CONVERSION (+) CH6 (–) CH7 0V 0V 1ST CONVERSION 4096 STEPS 2ND CONVERSION 4096 STEPS –5V 2ND CONVERSION (–) CH6 (+) CH7 0V VIN VIN VIN 5V –5V SOFTWARE 8191 STEPS 1290 TA05 SNEAK-A-BIT SNEAK-A-BIT is a trademark of Linear Technology Corp. |
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