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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC1289BCSW датащи(PDF) 23 Page - Linear Technology |
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LTC1289BCSW датащи(HTML) 23 Page - Linear Technology |
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23 / 28 page  23 LTC1289 1289fb A “Quick Look” Circuit for the LTC1289 Users can get a quick look at the function and timing of the LTC1289 by using the following simple circuit. REF+ and DIN are tied to VCC selecting a 3V input span, CH7 as a single-ended input, unipolar mode, MSB-first format and 16-bit word length. ACLK is driven by an external clock and SCLK is driven by one half the clock rate. CS is driven at 1/128 the clock rate by the 74HC393 and DOUT outputs the data. All other pins are tied to a ground plane. The output data from the DOUT pin can be viewed on an oscilloscope which is set up to trigger on the falling edge of CS. A “Quick Look” Circuit for the LTC1289 Scope Trace of LTC1289 “Quick Look” Circuit Showing A/D Output of 010101010101 (555HEX) S APPLICATI TYPICAL LTC1289 TA02 LTC1289 0.1 µF 22 µF f CHO CH1 CH2 CH3 CH4 CH5 CH6 CH7 COM DGND VIN TO OSCILLOSCOPE 74HC393 A1 CLR1 1QA 1QB 1QC 1QD GND VCC A2 CLR2 2QA 2QB 2QC 2QD CLOCK IN 2MHz MAX 3.0V f/2 f/128 VCC ACLK SCLK DIN DOUT CS REF+ REF– V– AGND ACLK SCLK CS D OUT MSB (B11) DEGLITCHER TIME LSB (B0) FILLS ZEROES VERTICAL: 5V/DIV HORIZONTAL: 2 µs/DIV SNEAK-A-BIT TM The LTC1289’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 that operates at 3.3V could be used. Two 12-bit unipolar conversions are performed: the first over a 0V to 2.5V span and the second over a 0V to –2.5V span (by reversing the polarity of the inputs). The sign of the input is determined by which of the two spans con- tained it. Then the resulting number (ranging from –4095 to +4095 decimal) is converted to 2’s complement nota- tion and stored in RAM. 2.5V 1ST CONVERSION (+) CH6 (–) CH7 0V 0V 1ST CONVERSION 4096 STEPS 2ND CONVERSION 4096 STEPS –2.5V 2ND CONVERSION (–) CH6 (+) CH7 0V VIN VIN 2.5V –2.5V SOFTWARE 8191 STEPS LTC1289 TA04 SNEAK-A-BIT SNEAK-A-BIT is a trademark of Linear Technology Corp. SNEAK-A-BIT Circuit LTC1289 TA03 10 µF 22 µF LT1019 –2.5 MC68HC05C4 SCLK MOSI MISO CO 1k –3.3V 0.1 µF 2MHz ACLK +3.3V OTHER CHANNELS OR SNEAK-A-BIT INPUTS VIN –2.5V TO +2.5V LTC1289 CHO CH1 CH2 CH3 CH4 CH5 CH6 CH7 COM DGND VCC ACLK SCLK DIN DOUT CS REF+ REF– V– AGND |
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