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AD584K 数据表(PDF) 4 Page - Analog Devices |
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AD584K 数据表(HTML) 4 Page - Analog Devices |
4 / 8 page AD584 REV. A –4– range will be about 20 V even for large values of R1. R2 should not be omitted; its value should be chosen to limit the output to a value which can be tolerated by the load circuits. If R2 is zero, adjusting R1 to its lower limit will result in a loss of control over the output voltage. If precision voltages are required to be set at levels other than the standard outputs, the 20% absolute toler- ance in the internal resistor ladder must be accounted for. Alternatively, the output voltage can be raised by loading the 2.5 V tap with R3 alone. The output voltage can be lowered by connecting R4 alone. Either of these resistors can be a fixed resistor selected by test or an adjustable resistor. In all cases the resistors should have a low temperature coefficient to match the AD584 internal resistors, which have a negative T.C. less than 60 ppm/ °C. If both R3 and R4 are used, these resistors should have matched temperature coefficients. When only small adjustments or trims are required, the circuit of Figure 2 offers better resolution over a limited trim range. The circuit can be programmed to 5.0 V, 7.5 V or 10 V and ad- justed by means of R1 over a range of about ±200 mV. To trim the 2.5 V output option, R2 (Figure 2) can be reconnected to the bandgap reference (Pin 6). In this configuration, the adjust- ment should be limited to ±100 mV in order to avoid affecting the performance of the AD584. Figure 2. Output Trimming Figure 3. Schematic Diagram APPLYING THE AD584 With power applied to Pins 8 and 4 and all other pins open, the AD584 will produce a buffered nominal 10.0 V output between Pins 1 and 4 (see Figure 1). The stabilized output voltage may be reduced to 7.5 V, 5.0 V or 2.5 V by connecting the program- ming pins as follows: Output Voltage Pin Programming 7.5 V Join the 2.5 V and 5.0 V pins (2) and (3) 5.0 V Connect the 5.0 V pin (2) to the output pin (1). 2.5 V Connect the 2.5 V pin (3) to the output pin (1). The options shown above are available without the use of any additional components. Multiple outputs using only one AD584, are also possible by simply buffering each voltage pro- gramming pin with a unity-gain noninverting op amp. Figure 1. Variable Output Options The AD584 can also be programmed over a wide range of out- put voltages, including voltages greater than 10 V, by the ad- dition of one or more external resistors. Figure 1 illustrates the general adjustment procedure, with approximate values given for the internal resistors of the AD584. The AD584 may be modeled as an op amp with a noninverting feedback connection, driven by a high stability 1.215 volt bandgap reference (see Fig- ure 3 for schematic). When the feedback ratio is adjusted with external resistors, the output amplifier can be made to multiply the reference voltage by almost any convenient amount, making popular outputs of 10.24 V, 5.12 V, 2.56 V or 6.3 V easy to obtain. The most general adjustment (which gives the greatest range and poorest resolution) uses R1 and R2 alone (see Figure 1). As R1 is ad- justed to its upper limit the 2.5 V Pin 3 will be connected to the output, which will reduce to 2.5 V. As R1 is adjusted to its lower limit, the output voltage will rise to a value limited by R2. For example, if R2 is about 6 k Ω, the upper limit of the output |
类似零件编号 - AD584K |
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类似说明 - AD584K |
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