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AD586MN データシート(PDF) 7 Page - Analog Devices |
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AD586MN データシート(HTML) 7 Page - Analog Devices |
7 / 8 page AD586 REV. C –7– NEGATIVE REFERENCE VOLTAGE FROM AN AD586 The AD586 can be used to provide a precision –5.000 V output as shown in Figure 11. The VIN pin is tied to at least a +6 V supply, the output pin is grounded, and the AD586 ground pin is connected through a resistor, RS, to a –15 V supply. The –5 V output is now taken from the ground pin (Pin 4) instead of VOUT. It is essential to arrange the output load and the supply resistor RS so that the net current through the AD586 is be- tween 2.5 mA and 10.0 mA. The temperature characteristics and long-term stability of the device will be essentially the same as that of a unit used in the standard +5 V output configuration. Figure 11. AD586 as a Negative 5 V Reference USING THE AD586 WITH CONVERTERS The AD586 is an ideal reference for a wide variety of 8-, 12-, 14- and 16-bit A/D and D/A converters. Several representative examples follow. 5 V REFERENCE WITH MULTIPLYING CMOS D/A OR A/D CONVERTERS The AD586 is ideal for applications with 10- and 12-bit multi- plying CMOS D/A converters. In the standard hookup, as shown in Figure 12, the AD586 is paired with the AD7545 12-bit multiplying DAC and the AD711 high-speed BiFET Op Amp. The amplifier DAC configuration produces a unipolar 0 V to –5 V output range. Bipolar output applications and other operating details can be found on the individual product data sheets. Figure 12. Low-Power 12-Bit CMOS DAC Application The AD586 can also be used as a precision reference for mul- tiple DACs. Figure 13 shows the AD586, the AD7628 dual DAC and the AD712 dual op amp hooked up for single supply operation to produce 0 V to –5 V outputs. Because both DACs are on the same die and share a common reference and output op amps, the DAC outputs will exhibit similar gain TCs. Figure 13. AD586 as a 5 V Reference for a CMOS Dual DAC STACKED PRECISION REFERENCES FOR MULTIPLE VOLTAGES Often, a design requires several reference voltages. Three AD586s can be stacked, as shown in Figure 14, to produce +5.000 V, +10.000 V, and +15.000 V outputs. This scheme can be extended to any number of AD586s as long as the maximum load current is not exceeded. This design pro- vides the additional advantage of improved line regulation on the +5.0 V output. Changes in VIN of +18 V to +50 V produces an output change that is below the noise level of the references. Figure 14. Multiple AD586s Stacked for Precision 5 V, 10 V and 15 V Outputs |
同様の部品番号 - AD586MN |
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同様の説明 - AD586MN |
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