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AD7781BRUZ Datenblatt(PDF) 5 Page - Analog Devices |
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AD7781BRUZ Datenblatt(HTML) 5 Page - Analog Devices |
5 / 16 page AD7781 Rev. 0 | Page 5 of 16 TIMING CHARACTERISTICS AVDD = 2.7 V to 5.25 V, DVDD = 2.7 V to 5.25 V, GND = 0 V, Input Logic 0 = 0 V, Input Logic 1 = DVDD, unless otherwise noted. Table 3. Parameter1 Limit at TMIN, TMAX Unit Test Conditions/Comments Read2 t1 100 ns min SCLK high pulse width t2 100 ns min SCLK low pulse width t33 0 ns min SCLK active edge to data valid delay4 60 ns max DVDD = 4.75 V to 5.25 V 80 ns max DVDD = 2.7 V to 3.6 V t4 10 ns min SCLK inactive edge to DOUT/RDY high 130 ns max Reset t5 100 ns min PDRST low pulse width t65 FILTER/GAIN change to data valid delay 120 ms typ Update rate = 16.7 Hz 300 ms typ Update rate = 10 Hz 1 Sample tested during initial release to ensure compliance. All input signals are specified with tR = tF = 5 ns (10% to 90% of DVDD) and timed from a voltage level of 1.6 V. 2 See Figure 3. 3 The values of t3 are measured using the load circuit of Figure 2 and are defined as the time required for the output to cross the VOL or VOH limits. 4 SCLK active edge is falling edge of SCLK. 5 The PDRST high to data valid delay is typically 1 ms longer than t6 because the internal oscillator requires time to power up and settle. Circuit and Timing Diagrams ISINK (1.6mA WITH DVDD = 5V, 100µA WITH DVDD = 3V) ISOURCE (200µA WITH DVDD = 5V, 100µA WITH DVDD = 3V) 1.6V TO OUTPUT PIN 50pF PDRST (INPUT) t5 DOUT/RDY (OUTPUT) GAIN OR FILTER (INPUT) Figure 2. Load Circuit for Timing Characterization DOUT/RDY (OUTPUT) MSB LSB SCLK (INPUT) t3 t1 t4 t2 Figure 3. Read Cycle Timing Diagram Figure 4. Resetting the AD7781 t6 DOUT/RDY (OUTPUT) Figure 5. Changing Gain or Filter Option |
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Ähnliche Beschreibung - AD7781BRUZ |
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