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AD7328 Datasheet(PDF) 7 Page - Analog Devices |
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AD7328 Datasheet(HTML) 7 Page - Analog Devices |
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7 / 37 page  AD7328 Data Sheet Rev. C | Page 6 of 36 TIMING SPECIFICATIONS VDD = 12 V to 16.5 V, VSS = −12 V to −16.5 V, VCC = 2.7 V to 5.25 V, VDRIVE = 2.7 V to 5.25 V, VREF = 2.5 V to 3.0 V internal/external, TA = TMAX to TMIN. Timing specifications apply with a 32 pF load, unless otherwise noted.1 Table 3. Limit at TMIN, TMAX Description Parameter VCC < 4.75 V VCC = 4.75 V to 5.25 V Unit VDRIVE ≤ VCC fSCLK 50 50 kHz min 14 20 MHz max tCONVERT 16 × tSCLK 16 × tSCLK ns max tSCLK = 1/fSCLK tQUIET 75 60 ns min Minimum time between end of serial read and next falling edge of CS t1 12 5 ns min Minimum CS pulse width t22 25 20 ns min CS to SCLK setup time; bipolar input ranges (±10 V, ±5 V, ±2.5 V) 45 35 ns min Unipolar input range (0 V to 10 V) t3 26 14 ns max Delay from CS until DOUT three-state disabled t4 57 43 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 13 8 ns min SCLK to data valid hold time t8 40 22 ns max SCLK falling edge to DOUT high impedance 10 9 ns min SCLK falling edge to DOUT high impedance t9 4 4 ns min DIN setup time prior to SCLK falling edge t10 2 2 ns min DIN hold time after SCLK falling edge tPOWER-UP 750 750 ns max Power up from autostandby 500 500 µs max Power up from full shutdown/autoshutdown mode, internal reference 25 25 µs typ Power up from full shutdown/autoshutdown mode, external reference 1 Sample tested during initial release to ensure compliance. All input signals are specified with tr = tf = 5 ns (10% to 90% of VDRIVE) and timed from a voltage level of 1.6 V. 2 When using the 0 V to 10 V unipolar range, running at 1 MSPS throughput rate with t2 at 20 ns, the mark-space ratio must be limited to 50:50. ADD1 1 2 3 4 5 13 14 15 16 WRITE REG SEL1 REG SEL2 LSB DON’T CARE MSB ADD0 SIGN DB11 DB10 DB2 DB1 DB0 t2 t6 t4 t9 t10 t3 t7 t5 t8 t1 tQUIET tCONVERT SCLK CS DOUT THREE- STATE THREE-STATE DIN ADD2 3 IDENTIFICATION BITS Figure 2. Serial Interface Timing Diagram |
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