전자부품 데이터시트 검색엔진 |
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AD7863AR-10REEL 데이터시트(PDF) 5 Page - Analog Devices |
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AD7863AR-10REEL 데이터시트(HTML) 5 Page - Analog Devices |
5 / 24 page AD7863 Rev. B | Page 5 of 24 TIMING CHARACTERISTICS VDD = 5 V ± 5%, AGND = DGND = 0 V, REF = Internal. All specifications TMIN to TMAX, unless otherwise noted. Table 2. Parameter1, 2 A, B Versions Unit Test Conditions/Comments tCONV 5.2 μs max Conversion time tACQ 0.5 μs max Acquisition time Parallel Interface t1 0 ns min CS to RD setup time t2 0 ns min CS to RD hold time t3 35 ns min CONVST pulse width t4 45 ns min RD pulse width t53 30 ns min Data access time after falling edge of RD t64 5 ns min Bus relinquish time after rising edge of RD 30 ns max t7 10 ns min Time between consecutive reads t8 400 ns min Quiet time 1 Sample tested at 25°C to ensure compliance. All input signals are measured with tr = tf = 1 ns (10% to 90% of 5 V) and timed from a voltage level of 1.6 V. 2 See Figure 2. 3 Measured with the load circuit of Figure 3 and defined as the time required for an output to cross 0.8 V or 2.0 V. 4 These times are derived from the measured time taken by the data outputs to change 0.5 V when loaded with the circuit of Figure 3. The measured number is then extrapolated back to remove the effects of charging or discharging the 50 pF capacitor. This means that the times quoted in the timing characteristics are the true bus relinquish times of the part and as such are independent of external bus loading capacitances. VA1 VA2 VB1 VB2 CONVST BUSY A0 CS RD DATA tCONV = 5.2µs t3 t8 tACQ t1 t4 t2 t5 t6 t7 Figure 2. Timing Diagram TO OUTPUT PIN 1.6mA 200µA 50pF Figure 3. Load Circuit for Access Time and Bus Relinquish Time |
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