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LTC2439-1 Datasheet(PDF) 16 Page - Linear Technology |
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LTC2439-1 Datasheet(HTML) 16 Page - Linear Technology |
16 / 28 page ![]() LTC2439-1 16 24391f Figure 7. External Serial Clock, Reduced Data Output Length (1) (0) EN SGL A2 A1 A0 ODD/ SIGN SDI DON’T CARE DON’T CARE SDO SCK (EXTERNAL) CS DATA OUTPUT CONVERSION SLEEP SLEEP SLEEP TEST EOC DATA OUTPUT Hi-Z Hi-Z Hi-Z CONVERSION 24391 F06 MSB SIG BIT 4 BIT 14 BIT 13 BIT 12 BIT 11 BIT 5 BIT 15 BIT 16 BIT 17 EOC BIT 18 BIT 0 EOC Hi-Z TEST EOC VCC FO REF+ REF– CH0 CH7 CH8 CH15 COM SCK SDI SDO CS GND 920 11 12 21 28 1 8 10 18 17 15 16 19 REFERENCE VOLTAGE 0.1V TO VCC ANALOG INPUTS 1 µF 2.7V TO 5.5V LTC2439-1 4-WIRE SPI INTERFACE • • • • • • • • • • • • TEST EOC (OPTIONAL) = EXTERNAL CLOCK SOURCE = INTERNAL OSC/SIMULTANEOUS 50Hz/60Hz REJECTION “O” APPLICATIO S I FOR ATIO shift register. The input data is then shifted in via the SDI pin on the rising edge of SCK (including the first rising edge) and the output data is shifted out of the SDO pin on each falling edge of SCK. EOC can be latched on the first rising edge of SCK. On the 19th falling edge of SCK, SDO goes HIGH (EOC = 1) indicating a new conversion has begun. Figure 8. External Serial Clock, CS = 0 Operation (1) (0) EN SGL A2 A1 A0 ODD/ SIGN SDI DON’T CARE DON’T CARE EOC BIT 18 SDO SCK (EXTERNAL) CS MSB SIG BIT 0 LSB BIT 6 BIT 14 BIT 13 BIT 12 BIT 11 BIT 15 BIT 16 BIT 17 DATA OUTPUT CONVERSION 24391 F07 CONVERSION VCC FO REF+ REF– CH0 CH7 CH8 CH15 COM SCK SDI SDO CS GND 920 11 12 21 28 1 8 10 18 17 15 16 19 REFERENCE VOLTAGE 0.1V TO VCC ANALOG INPUTS 1 µF 2.7V TO 5.5V LTC2439-1 3-WIRE SPI INTERFACE • • • • • • • • • • • • = EXTERNAL CLOCK SOURCE = INTERNAL OSC/SIMULTANEOUS 50Hz/60Hz REJECTION “O” |
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