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AD679TD データシート(PDF) 4 Page - Analog Devices |
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AD679TD データシート(HTML) 4 Page - Analog Devices |
4 / 16 page AD679 REV. D –4– Parameter Symbol Min Max Unit SC Delay tSC 50 ns Conversion Time tC 6.3 µs Conversion Rate 1 tCR 7.8 µs Convert Pulse Width tCP 0.097 3.0 µs Aperture Delay tAD 520 ns Status Delay tSD 0 400 ns Access Time 2, 3 tBA 10 100 ns 10 57 4 ns Float Delay 5 tFD 10 80 ns Output Delay tOD 0ns Format Setup tFS 100 ns OE Delay tOE 20 ns Read Pulse Width tRP 195 ns Conversion Delay tCD 400 ns EOCEN Delay tEO 50 ns NOTES 1Includes acquisition time. 2Measured from the falling edge of OE/EOCEN (0.8 V) to the time at which the data lines/EOC cross 2.0 V or 0.8 V. See Figure 4. 3C OUT = 100 pF. 4C OUT = 50 pF. 5Measured from the rising edge of OE/EOCEN (2.0 V) to the time at which the output voltage changes by 0.5. See Figure 4; C OUT = 10 pF. Specifications subject to change without notice. (All device types TMIN to TMAX, VCC = +12 V 5%, VEE = –12 V 5%, VDD = +5 V 10%) NOTES 1IN ASYNCHRONOUS MODE, STATE OF CS DOES NOT AFFECT OPERATION. SEE THE START CONVERSION TRUTH TABLE FOR DETAILS. 2 EOCEN = LOW (SEE FIGURE 3). IN SYNCHRONOUS MODE, EOC IS A THREE- STATE OUTPUT. IN ASYNCHRONOUS MODE, EOC IS AN OPEN DRAIN OUTPUT. 3DATA SHOULD NOT BE ENABLED DURING A CONVERSION. Figure 1. Conversion Timing Figure 2. Output Timing NOTE 1EOC IS A THREE-STATE OUTPUT IN SYNCHRONOUS MODE AND AN OPEN DRAIN OUTPUT IN ASYNCHRONOUS. ACCESS (tBA) AND FLOAT (tFD) TIMING SPECIFICATIONS DO NOT APPLY IN ASYNCHRONOUS MODE WHERE THEY ARE A FUNCTION OF THE TIME CONSTANT FORMED BY THE 10pF OUTPUT CAPACITANCE AND THE PULL-UP RESISTOR. Figure 3. EOC Timing TEST VCP COUT ACCESS TIME HIGH Z TO LOGIC LOW 5V 100pF FLOAT TIME LOGIC HIGH TO HIGH Z 0V 10pF ACCESS TIME HIGH Z TO LOGIC HIGH 0V 100pF FLOAT TIME LOGIC LOW TO HIGH Z 5V 10pF IOL IOH DOUT VCP COUT Figure 4. Load Circuit for Bus Timing Specifications TIMING SPECIFICATIONS |
同様の部品番号 - AD679TD |
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同様の説明 - AD679TD |
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