Datasheet AD7680 (Analog Devices) - 7

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AD7680 TIMING SPECIFICATIONS 1 Table 4. VDD = 2.5 V to 5.5 V; TA = TMIN to TMAX, unless otherwise noted. Limit at TMIN, TMAX Parameter 3 V 5 V Unit Description
f 2 SCLK 250 250 kHz min 2.5 2.5 MHz max tCONVERT 20 × tSCLK 20 × tSCLK min tQUIET 100 100 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 t 3 3 48 35 ns max Delay from CS until SDATA three-state disabled t 3 4 120 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 t 4 8 45 35 ns max SCLK falling edge to SDATA high impedance t 5 POWER-UP 1 1 μs typ Power up time from full power-down 1 Sample tested during 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. 2 Mark/space ratio for the SCLK input is 40/60 to 60/40. 3 Measured with the load circuit of Figure 2 and defined as the time required for the output to cross 0.8 V or 2.0 V. 4 t8 is derived form the measured time taken by the data outputs to change 0.5 V when loaded with the circuit of Figure 2. 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. 5 See Power vs. Throughput Rate section.
200
μ
A IOL TO OUTPUT 1.6V PIN CL 50pF 200
μ
A IOH
03643-0-002 Figure 2. Load Circuit for Digital Output Timing Specification Rev. A | Page 6 of 24 Document Outline SPECIFICATIONS SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TERMINOLOGY TYPICAL PERFORMANCE CHARACTERISTICS CIRCUIT INFORMATION CONVERTER OPERATION ANALOG INPUT ADC TRANSFER FUNCTION TYPICAL CONNECTION DIAGRAM Digital Inputs MODES OF OPERATION NORMAL MODE POWER-DOWN MODE POWER VS. THROUGHPUT RATE SERIAL INTERFACE AD7680 TO ADSP-218x APPLICATION HINTS GROUNDING AND LAYOUT OUTLINE DIMENSIONS ORDERING GUIDE