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AD7940 데이터시트(PDF) 5 Page - Analog Devices |
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AD7940 데이터시트(HTML) 5 Page - Analog Devices |
5 / 20 page AD7940 Rev. 0 | Page 5 of 20 TIMING SPECIFICATIONS Sample tested at initial release to ensure compliance. All input signals are specified with tr = tf = 5 ns (10% to 90% of VDD) and timed from a voltage level of 1.6 V. VDD = 2.50 V to 5.5 V; TA = TMIN to TMAX, unless otherwise noted. Table 3. Limit at TMIN, TMAX Parameter 3 V 5 V Unit Description fSCLK1 250 250 kHz min 2.5 2.5 MHz max tCONVERT 16 × tSCLK 16 × tSCLK min tQUIET 50 50 ns min Minimum quiet time required between bus relinquish and start of next conversion t1 10 10 ns min Minimum CS pulse width t2 10 10 ns min CS to SCLK setup time t32 48 35 ns max Delay from CS until SDATA three-state disabled t42 120 80 ns max Data access time after SCLK falling edge t5 0.4 tSCLK 0.4 tSCLK ns min SCLK low pulse width t6 0.4 tSCLK 0.4 tSCLK ns min SCLK high pulse width t7 10 10 ns min SCLK to data valid hold time t83 45 35 ns max SCLK falling edge to SDATA high impedance tPOWER-UP4 1 1 µs typ Power up time from full power-down 1 Mark/space ratio for the SCLK input is 40/60 to 60/40. 2 Measured with the load circuit of and defined as the time required for the output to cross 0.8 V or 2.0 V. Figure 2 Figure 2. 3 t8 is derived form the measured time taken by the data outputs to change 0.5 V when loaded with the circuit of The measured number is then extrapolated back to remove the effects of charging or discharging the 50 pF capacitor. This means that the time, t8, quoted in the timing characteristics is the true bus relinquish time of the part and is independent of the bus loading. 4 See the section. Power vs. Throughput Rate 200 µAI OL 200 µAI OH 1.6V TO OUTPUT PIN CL 50pF Figure 2. Load Circuit for Digital Output Timing Specification |
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