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ADE7753 Scheda tecnica(PDF) 6 Page - Analog Devices |
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ADE7753 Scheda tecnica(HTML) 6 Page - Analog Devices |
6 / 60 page ADE7753 Rev. C | Page 6 of 60 TIMING CHARACTERISTICS AVDD = DVDD = 5 V ± 5%, AGND = DGND = 0 V, on-chip reference, CLKIN = 3.579545 MHz XTAL, TMIN to TMAX = −40°C to +85°C. Sample tested during initial release and after any redesign or process change that could affect this parameter. All input signals are specified with tr = tf = 5 ns (10% to 90%) and timed from a voltage level of 1.6 V. See Figure 3, Figure 4, and the ADE7753 Serial Interface section. Table 2. Parameter Spec Unit Test Conditions/Comments Write Timing t1 50 ns (min) CS falling edge to first SCLK falling edge. t2 50 ns (min) SCLK logic high pulse width. t3 50 ns (min) SCLK logic low pulse width. t4 10 ns (min) Valid data setup time before falling edge of SCLK. t5 5 ns (min) Data hold time after SCLK falling edge. t6 4 μs (min) Minimum time between the end of data byte transfers. t7 50 ns (min) Minimum time between byte transfers during a serial write. t8 100 ns (min) CS hold time after SCLK falling edge. Read Timing t91 4 μs (min) Minimum time between read command (i.e., a write to communication register) and data read. t10 50 ns (min) Minimum time between data byte transfers during a multibyte read. t11 30 ns (min) Data access time after SCLK rising edge following a write to the communications register. t122 100 ns (max) Bus relinquish time after falling edge of SCLK. 10 ns (min) t133 100 ns (max) Bus relinquish time after rising edge of CS. 10 ns (min) 1 Minimum time between read command and data read for all registers except waveform register, which is t9 = 500 ns min. 2 Measured with the load circuit in Figure 2 and defined as the time required for the output to cross 0.8 V or 2.4 V. 3 Derived from the measured time taken by the data outputs to change 0.5 V when loaded with the circuit in 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 quoted in the timing characteristics is the true bus relinquish time of the part and is independent of the bus loading. DIN SCLK CS t2 t3 t1 t4 t5 t7 t6 t8 COMMAND BYTE MOST SIGNIFICANT BYTE LEAST SIGNIFICANT BYTE 1 0 A4 A5 A3 A2 A1 A0 DB7 DB0 DB7 DB0 t7 02875-0-081 Figure 3. Serial Write Timing SCLK CS t1 t10 t13 0 0 A4 A5 A3 A2 A1 A0 DB0 DB7 DB0 DB7 DIN DOUT t11 t11 t12 COMMAND BYTE MOST SIGNIFICANT BYTE LEAST SIGNIFICANT BYTE t9 02875-0-083 Figure 4. Serial Read Timing |
Codice articolo simile - ADE7753_10 |
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Descrizione simile - ADE7753_10 |
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