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AD7779ACPZ Fiches technique(PDF) 10 Page - Analog Devices |
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AD7779ACPZ Fiches technique(HTML) 10 Page - Analog Devices |
10 / 97 page AD7779 Data Sheet Rev. 0 | Page 10 of 97 SPI TIMING CHARACTERISTISTICS AVDD1x/AVSSx = ±1.65 V, 3.3 V/AGND, AVDD2 − AVSSx = 2.2 V to 3.6 V; IOVDD = 1.8 V to 3.6 V; DGND = 0 V, REFx+/REFx− = 2.5 V (internal/external), MCLK = 8192 kHz; all specifications at TMIN to TMAX, unless otherwise noted. Table 3. Parameter Description1 Test Conditions/Comments Min Typ Max Unit t12 SCLK Period 50:50 30 MHz t13 SCLK Low Time 7 ns t14 SCLK High Time 7 ns t15 SCLK Rising Edge to CS Falling Edge 10 ns t16 CS Falling Edge to SCLK Rising Edge 10 ns t17 SCLK Rising Edge to CS Rising Edge 10 ns t18 CS Rising Edge to SCLK Rising Edge 10 ns t19 Minimum CS High Time 10 ns t20 SDI Setup Time 5 ns t21 SDI Hold Time 5 ns t22A CS Falling Edge to SDO Enable (SPI = Mode 0) 30 ns t22B SCLK Falling Edge to SDO Enable (SPI = Mode 1) 49 ns t23 SDO Setup Time 10 ns t24 SDO Hold Time 10 ns t25 CS Rising Edge to SDO Disable 30 ns 1 All input signals are specified with tR = tF = 1 ns/V (10% to 90% of IOVDD) and timed from a voltage level of (VIL + VIH)/2. CS SCLK MSB MSB – 1 LSB + 1 LSB SDI MSB MSB – 1 LSB + 1 LSB SDO t15 t16 t13 t14 t20 t22A t21 t24 t23 t22B t12 t19 t17 t18 t25 Figure 3. SPI Control Interface Timing Diagram |
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