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AD7691 Datasheet(PDF) 5 Page - Analog Devices |
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AD7691 Datasheet(HTML) 5 Page - Analog Devices |
5 / 28 page AD7686 Rev. B | Page 5 of 28 TIMING SPECIFICATIONS −40°C to +85°C, VDD = 4.5 V to 5.5 V, VIO = 2.3 V to 5.5 V or VDD + 0.3 V, whichever is the lowest, unless otherwise stated. See Figure 3 and Figure 4 for load conditions. Table 4. Parameter Symbol Min Typ Max Unit Conversion Time: CNV Rising Edge to Data Available tCONV 0.5 1.6 μs Acquisition Time tACQ 400 ns Time Between Conversions tCYC 2 μs CNV Pulse Width ( CS Mode) tCNVH 10 ns SCK Period (CS Mode) tSCK 15 ns SCK Period (Chain Mode) tSCK VIO Above 4.5 V 17 ns VIO Above 3 V 18 ns VIO Above 2.7 V 19 ns VIO Above 2.3 V 20 ns SCK Low Time tSCKL 7 ns SCK High Time tSCKH 7 ns SCK Falling Edge to Data Remains Valid tHSDO 5 ns SCK Falling Edge to Data Valid Delay tDSDO VIO Above 4.5 V 14 ns VIO Above 3 V 15 ns VIO Above 2.7 V 16 ns VIO Above 2.3 V 17 ns CNV or SDI Low to SDO D15 MSB Valid (CS Mode) tEN VIO Above 4.5 V 15 ns VIO Above 2.7 V 18 ns VIO Above 2.3 V 22 ns CNV or SDI High or Last SCK Falling Edge to SDO High Impedance (CS Mode) tDIS 25 ns SDI Valid Setup Time from CNV Rising Edge (CS Mode) tSSDICNV 15 ns SDI Valid Hold Time from CNV Rising Edge (CS Mode) tHSDICNV 0 ns SCK Valid Setup Time from CNV Rising Edge (Chain Mode) tSSCKCNV 5 ns SCK Valid Hold Time from CNV Rising Edge (Chain Mode) tHSCKCNV 5 ns SDI Valid Setup Time from SCK Falling Edge (Chain Mode) tSSDISCK 3 ns SDI Valid Hold Time from SCK Falling Edge (Chain Mode) tHSDISCK 4 ns SDI High to SDO High (Chain Mode with Busy Indicator) tDSDOSDI VIO Above 4.5 V 15 ns VIO Above 2.3 V 26 ns 500µA IOL 500µA IOH 1.4V TO SDO CL 50pF Figure 3. Load Circuit for Digital Interface Timing 30% VIO 70% VIO 2V OR VIO – 0.5V1 0.8V OR 0.5V2 0.8V OR 0.5V2 2V OR VIO – 0.5V1 tDELAY tDELAY 12V IF VIO ABOVE 2.5V, VIO – 0.5V IF VIO BELOW 2.5V. 20.8V IF VIO ABOVE 2.5V, 0.5V IF VIO BELOW 2.5V. Figure 4. Voltage Levels for Timing |
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