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OP290GS Datasheet(PDF) 10 Page - Analog Devices |
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OP290GS Datasheet(HTML) 10 Page - Analog Devices |
10 / 12 page REV. A OP290 –10– 1/2 OP290GP 1 1/2 OP290GP 3 2 7 6 5 R1 250k C1 0.1 F +15V –15V VOUT R2 100k R3 1M D2 D1 DIODES ARE 1N4148 4 R4 25k C1 4700pF 8 Figure 6. Variable Slew Rate Filter LOW OVERHEAD VOLTAGE REFERENCE Figure 7 shows a voltage reference that requires only 0.1 V of overhead voltage. As shown, the reference provides a stable 4.5 V output with a 4.6 V to 36 V supply. Output voltage drift is only 12 ppm/ °C. Line regulation of the reference is under 5 HV/V with load regulation better than 10 µV/mA with up to 50 mA of output current. The REF-43 provides a stable 2.5 V which is multiplied by the OP290. The PNP output transistor enables the output voltage to approach the supply voltage. Resistors R1 and R2 determine the output voltage. VV R R OUT =+ 25 1 2 1 . The 200 Ω variable resistor is used to trim the output voltage. For the lowest temperature drift, parallel resistors can be used in place of the variable resistor and taken out of the circuit as required to adjust the output voltage. 6 2 4 REF-43FZ R1B 200 20-TURN BOURNS 3006P-1-201 VOUT VIN VOUT GND R1A 2.37 1% C1 10 F C2 0.1 F V+ R2 2k 1% 2N2907A 1 1/2 OP290GP 3 2 8 4 Figure 7. Low Overhead Voltage Reference |
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