Datasheet AD7888 (Analog Devices) - 5

AD7888 TIMING SPECIFICATIONS1 (TA = TMIN to TMAX, unless otherwise noted) Limit at TMIN, TMAX (A, B Versions) Parameter 4.75 V to 5.25 V 2.7 V to 3.6 V Unit Description
f 2 SCLK 2 2 MHz max tCONVERT 14.5 tSCLK 14.5 tSCLK tACQ 1.5 tSCLK 1.5 tSCLK Throughput Time = tCONVERT + tACQ = 16 tSCLK t1 10 10 ns min CS to SCLK Setup Time t 3 2 30 60 ns max Delay from CS until DOUT 3-State Disabled t 3 3 75 100 ns max Data Access Time after SCLK Falling Edge t4 20 20 ns min Data Setup Time Prior to SCLK Rising Edge t5 20 20 ns min Data Valid to SCLK Hold Time t6 0.4 tSCLK 0.4 tSCLK ns min SCLK High Pulsewidth t7 0.4 tSCLK 0.4 tSCLK ns min SCLK Low Pulsewidth t 4 8 80 80 ns max CS Rising Edge to DOUT High Impedance t9 5 5 µs typ Power-Up Time from Shutdown NOTES 1Sample tested at 25°C to ensure compliance. All input signals are specified with tr = tf = 5 ns (10% to 90% of V DD) and timed from a voltage level of 1.6 V. 2Mark/Space ratio for the SCLK input is 40/60 to 60/40. See Serial Interface section. 3Measured with the load circuit of Figure 1 and defined as the time required for the output to cross 0.8 V or 2.4 V with V DD = 5 V ± 10% and time for an output to cross 0.4 V or 2.0 V with VDD = 3 V ± 10%. 4t8 is derived from the measured time taken by the data outputs to change 0.5 V when loaded with the circuit of Figure 1. The measured number is then extrapolated back to remove the effects of charging or discharging the 50 pF capacitor. This means that the time, t 8, quoted in the timing characteristics is the true bus relinquish time of the part and is independent of the bus loading. Specifications subject to change without notice.
I 200
␮
A OL TO 1.6V OUTPUT PIN CL 50pF 200
␮
A IOH
Figure 1. Load Circuit for Digital Output Timing Specifications –4– REV. C