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LTC1283AC 数据表(PDF) 22 Page - Linear Technology |
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LTC1283AC 数据表(HTML) 22 Page - Linear Technology |
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22 / 24 page  22 LTC1283 S APPLICATI TYPICAL A “Quick Look” Circuit for the LTC1283 SNEAK-A-BIT is a trademark of Linear Technology Corp. SNEAK-A-BIT TM The LTC1283’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 10-bit + sign word is returned to memory inside the MPU. The MC68HC05C4 was chosen as an example; however, any processor could be used. Two 10-bit unipolar conversions are performed: the first over a 0V to 3V span and the second over a 0V to – 3V span (by reversing the polarity of the inputs). The sign of the input is determined by which of the two spans contain it. Then the resulting number (ranging from – 1023 to 1023 decimal) is converted to 2’s complement notation and stored in RAM. SNEAK-A-BIT Code LTC1283 • TA05 MC68HC05C4 SCK MOSI MISO CO –3V 0.1 µF 1MHz CLOCK OTHER CHANNELS OR SNEAK-A-BIT INPUTS 3V LTC1283 CHO CH1 CH2 CH3 CH4 CH5 CH6 CH7 COM DGND VCC ACLK SCLK DIN DOUT CS REF+ REF– V– AGND 10 µF VIN –3V TO 3V SNEAK-A-BIT Circuit DOUT from LTC1283 in MC68HC05C4 B10 B9 B8 B7 B6 B5 B4 B3 SIGN LSB LTC1283 • TA07 B2 B1 B0 FILLED WITH 0’s LOCATION $77 LOCATION $87 DIN Words for LTC1283 00 1 1 1 1 1 1 UNI LTC1283 • TA08 DIN 1 MSBF WORD LENGTH (ODD/SIGN) MUX ADDR. 01 1 1 1 1 1 1 DIN 2 00 1 1 1 1 1 1 DIN 3 LTC1283 • TA03 LTC1283 0.1 µF 4.7 µF f CHO CH1 CH2 CH3 CH4 CH5 CH6 CH7 COM DGND VIN TO OSCILLOSCOPE CD4520 CLK EN Q1 Q2 Q3 Q4 RESET VSS CLOCK IN 500kHz MAX 3V VCC ACLK SCLK DIN DOUT CS REF+ REF– V– AGND VDD RESET Q4 Q3 Q2 Q1 EN CLK f/64 |
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