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AD586LR Datasheet(PDF) 11 Page - Analog Devices |
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AD586LR Datasheet(HTML) 11 Page - Analog Devices |
11 / 16 page AD586 Rev. G | Page 11 of 16 5 V REFERENCE WITH MULTIPLYING CMOS DACs OR ADCs The AD586 is ideal for applications with 10- and 12-bit multiplying CMOS DACs. In the standard hookup, as shown in Figure 20, 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 in the individual product data sheets. AD586 GND VOUT VIN AD711K 0.1 µF 0.1 µF –15V 0 V TO –5V +15V OUT 1 AGND DGND DB11 TO DB0 C1 33pF R2 68 Ω RFB +15V VDD AD7545K VREF 10k Ω VOUT TRIM +15V 20 18 19 6 5 4 2 3 1 2 7 4 6 3 2 Figure 20. Low Power 12-Bit CMOS DAC Application The AD586 can also be used as a precision reference for multi- ple DACs. Figure 21 shows the AD586, the AD7628 dual DAC, and the AD712 dual op amp hooked up for single-supply opera- tion 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. AD586 GND AD712 OUT A DGND AGND DAC A DB0 DB7 DATA INPUTS OUT B DAC B RFB B RFB A VREFA VREFB AD7628 VIN VOUT A= 0TO–5V VOUT B= 0TO–5V VOUT +15V +15V 6 4 4 7 14 2 5 3 17 1 19 20 2 4 Figure 21. AD586 as a 5 V Reference for a CMOS STACKED PRECISION REFERENCES FOR MULTIPLE VOLTAGES Often, a design requires several reference voltages. Three AD586s can be stacked, as shown in Figure 22, to produce 5.000 V, 10.000 V, and 15.000 V outputs. This scheme can be extended to any number of AD586s, provided the maximum load current is not exceeded. This design provides the addi- tional advantage of improved line regulation on the 5.0 V output. Changes in VIN of 18 V to 50 V produce output changes that are below the noise level of the references. 22V TO 46V AD586 GND VOUT VIN TRIM 10k Ω AD586 GND VOUT VIN TRIM AD586 GND VOUT VIN TRIM 10k Ω 10k Ω 15V 10V 5V 2 4 5 6 2 4 5 6 2 4 5 6 Figure 22. Multiple AD586s Stacked for Precision 5 V, 10 V, and 15 V Outputs PRECISION CURRENT SOURCE The design of the AD586 allows it to be easily configured as a current source. By choosing the control resistor RC in Figure 23, the user can vary the load current from the quiescent current (typically, 2 mA) to approximately 10 mA. The compliance volt- age of this circuit varies from about 5 V to 21 V, depending on the value of VIN. AD586 GND VOUT VIN 5V RC IL = + IBIAS +VIN RC (500 Ω MIN) 2 4 6 Figure 23. Precision Current Source PRECISION HIGH CURRENT SUPPLY For higher currents, the AD586 can easily be connected to a power PNP or power Darlington PNP device. The circuit in Figure 24 and Figure 25 can deliver up to 4 amps to the load. The 0.1 µF capacitor is required only if the load has a significant capacitive component. If the load is purely resistive, improved high frequency supply rejection results can be obtained by removing the capacitor. |
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