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AD5687BRUZ Scheda tecnica(PDF) 6 Page - Analog Devices |
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AD5687BRUZ Scheda tecnica(HTML) 6 Page - Analog Devices |
6 / 24 page AD5689/AD5687 Data Sheet Rev. 0 | Page 6 of 24 DAISY-CHAIN AND READBACK TIMING CHARACTERISTICS All input signals are specified with tR = tF = 1 ns/V (10% to 90% of VDD) and timed from a voltage level of (VIL + VIH)/2. See Figure 4 and Figure 5. VDD = 2.7 V to 5.5 V, 1.8 V ≤ VLOGIC ≤ 5.5 V, VREF = 2.5 V. All specifications TMIN to TMAX, unless otherwise noted. VDD = 2.7 V to 5.5 V. Table 5. 1.8 V ≤ VLOGIC < 2.7 V 2.7 V ≤ VLOGIC ≤ 5.5 V Unit Parameter1 Min Max Min Max Description t1 66 40 ns SCLK cycle time t2 33 20 ns SCLK high time t3 33 20 ns SCLK low time t4 33 20 ns SYNC to SCLK falling edge t5 5 5 ns Data setup time t6 5 5 ns Data hold time t7 15 10 ns SCLK falling edge to SYNC rising edge t8 60 30 ns Minimum SYNC high time t9 60 30 ns Minimum SYNC high time t10 36 25 ns SDO data valid from SCLK rising edge t11 15 10 ns SCLK falling edge to SYNC rising edge t12 15 10 ns SYNC rising edge to SCLK rising edge 1 Maximum SCLK frequency is 25 MHz or 15 MHz at VDD = 2.7 V to 5.5 V, 1.8 V ≤ VLOGIC ≤ VDD. Guaranteed by design and characterization; not production tested. Circuit and Timing Diagrams Figure 3. Load Circuit for Digital Output (SDO) Timing Specifications Figure 4. Daisy-Chain Timing Diagram 200µA IOL 200µA IOH VOH (MIN) TO OUTPUT PIN CL 20pF t4 t5 t6 t8 SDO SDIN SYNC SCLK 48 24 DB23 DB0 DB23 DB0 DB23 INPUT WORD FOR DAC N UNDEFINED INPUT WORD FOR DAC N + 1 INPUT WORD FOR DAC N DB0 t11 t12 t10 |
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