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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD7322 датащи(PDF) 7 Page - Analog Devices |
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AD7322 датащи(HTML) 7 Page - Analog Devices |
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7 / 37 page  AD7322 Data Sheet Rev. B | Page 6 of 36 TIMING SPECIFICATIONS Unless otherwise noted, 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, VDRIVE ≤ VCC, VREF = 2.5 V to 3.0 V internal/external, TA = TMAX to TMIN.1 Table 3. Limit at TMIN, TMAX Parameter VCC < 4.75 V VCC = 4.75 V to 5.25 V Unit Description 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. ZERO 1 2 3 4 5 13 14 15 16 WRITE ZERO REG SEL LSB 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 ZERO IDENTIFICATION BIT DON’T CARE Figure 2. Serial Interface Timing Diagram |
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