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AD584JH датащи(PDF) 6 Page - Analog Devices |
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AD584JH датащи(HTML) 6 Page - Analog Devices |
6 / 12 page AD584 Data Sheet Rev. C | Page 6 of 12 THEORY OF OPERATION APPLYING THE AD584 With power applied to Pin 8 and Pin 4 and all other pins open, the AD584 produces a buffered nominal 10.0 V output between Pin 1 and Pin 4 (see Figure 3). The stabilized output voltage can be reduced to 7.5 V, 5.0 V, or 2.5 V by connecting the programming pins as shown in Table 4. Table 4. Output Voltage (V) Pin Programming 7.5 Join the 2.5 V (Pin 3) and 5.0 V (Pin 2) pins. 5.0 Connect the 5.0 V pin (Pin 2) to the output pin (Pin 1). 2.5 Connect the 2.5 V pin (Pin 3) to the output pin (Pin 1). The options shown in Table 4 are available without the use of any additional components. Multiple outputs using only one AD584 can be provided by buffering each voltage programming pin with a unity-gain, noninverting op amp. Figure 3. Variable Output Options The AD584 can also be programmed over a wide range of output voltages, including voltages greater than 10 V, by the addition of one or more external resistors. Figure 3 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 V band gap reference (see Figure 5 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 3). As R1 is adjusted to its upper limit, the 2.5V pin (Pin 3) is connected to the output, which reduces to 2.5 V. As R1 is adjusted to its lower limit, the output voltage rises to a value limited by R2. For example, if R2 is approximately 6 kΩ, the upper limit of the output range is approximately 20 V, even for the large values of R1. Do not omit R2; choose its value to limit the output to a value that can be tolerated by the load circuits. If R2 is zero, adjusting R1 to its lower limit results in a loss of control over the output voltage. When precision voltages are set at levels other than the standard outputs, account for the 20% absolute tolerance in the internal resistor ladder. 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 temperature coefficient less than 60 ppm/°C. If both R3 and R4 are used, these resistors should have matching temperature coefficients. When only small adjustments or trims are required, the circuit in Figure 4 offers better resolution over a limited trim range. The circuit can be programmed to 5.0 V, 7.5 V, or 10 V, and it can be adjusted by means of R1 over a range of about ±200 mV. To trim the 2.5 V output option, R2 (see Figure 4) can be reconnected to the band gap reference (Pin 6). In this configuration, limit the adjustment to ±100 mV to avoid affecting the performance of the AD584. Figure 4. Output Trimming Figure 5. Schematic Diagram AD584 VSUPPLY VOUT 8 1 2 3 6 1.215V 10V 5V * 2.5V 12kΩ 6kΩ VBG R4 4 COMMON R1 R2 R3 6kΩ 24kΩ * THE 2.5V TAP IS USED INTERNALLY AS A BIAS POINT AND SHOULD NOT BE CHANGED BY MORE THAN 100mV IN ANY TRIM CONFIGURATION. AD584 VOUT 1 10.0V 8 V+ 4 COMMON 2 5.0V 3 2.5V 6 VBG R1 10kΩ R2 300kΩ R38 R40 Q10 Q16 Q13 Q11 Q14 Q12 Q15 SUB CAP R41 R42 R34 R37 R35 R30 R31 R36 Q6 Q8 Q5 C51 C52 C50 Q20 Q7 STROBE V+ OUT 10V 5V TAP 2.5V TAP VBG V– R32 R33 Q3 Q4 Q2 Q1 R39 |
Аналогичный номер детали - AD584JH |
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Аналогичное описание - AD584JH |
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