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AD561TD データシート(PDF) 8 Page - Analog Devices |
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AD561TD データシート(HTML) 8 Page - Analog Devices |
8 / 8 page AD561 –8– REV. A OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 16-Pin Ceramic Package D-16 16-Pin Plastic Package N-16 Figure 9. Fast Precision Analog to Digital Converter A much faster converter can be constructed by using higher performance external components. Each individual high-order bit settles in less than 250 ns; the low-order bits in less than 200 ns. Because of this, a staged clock, which speeds up for lower bits will improve the speed. Also, a faster comparator and Schottky TTL or ECL logic would be necessary. 10-bit convert- ers in the 3 µs to 5 µs range could be built around the AD561 with these techniques. DIGITAL 4-TO-20 mA OR 1-TO-5 VOLT CONVERTER A direct digital 4-to-20 mA or 1-to-5 volt line driver can be built with the AD561 as shown in Figure 10. The 2.5 volt reference is divided to provide 1 volt at the op amp noninverting input – thus a zero input code results in a 1 volt output at the Darlington emitter (VOUT). The 2 k feedback resistance converts the nominal 2 mA ( ± 20%) full-scale output from the AD561 to 4 volts, for a total output of 5 volts FS. The voltage at the emitter forces a proportional current through the 250 Ω (which appears at the collector as IOUT) The AD561 current is added to the 4–20 mA line; thus 5 volts full scale gives 22 mA in the current loop. For exactly 20 mA, trim the 1 k pot for 4.5 V FS. (A single op amp circuit will not produce both 1 to 5 volt and 4-to-20 mA outputs simultaneously.) Figure 10. Digital 4-to-20 mA or 1-to-5 Volt Line Driver DIGITALLY PROGRAMMABLE SETPOINT COMPARATOR Figure 11 demonstrates a high accuracy systems-oriented setpoint comparator. The 2.5 volt reference is buffered and amplified by the AD741K to produce an exact 10.000 volt reference which could be used as a primary system reference for several such circuits. The +10 volt compliance of the AD561 then allows it to generate a zero to +10 volt output swing through the 5 k Ω application resistor without an additional op amp. The digital code for this system will be complementary binary (all 1s give 0.00 volts out). Figure 11. Digitally Programmable Set-Point Comparator |
同様の部品番号 - AD561TD |
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同様の説明 - AD561TD |
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