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REF01CPZ2 Datasheet(PDF) 10 Page - Analog Devices |
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REF01CPZ2 Datasheet(HTML) 10 Page - Analog Devices |
10 / 12 page REF01 Rev. H | Page 10 of 12 PRECISION CURRENT SOURCE A current source with 25 V output compliance and excellent output impedance can be obtained using this circuit. REF01 keeps the line voltage and power dissipation constant in the device; the only important error consideration at room temperature is the negative supply rejection of the op amp. The typical 3 µV/V PSRR of the OP02E creates an 8 ppm change (3 µV/V × 25 V/10 V) in output current over a 25 V range. For example, a 10 mA current source can be built (R = 1 kΩ) with 300 MΩ output impedance. mA 10 10 8 V 25 6 × × = − O R GND REF01 GND REF01 OP02E C C R 2 2 2 6 6 7 3 4 6 4 4 +50V –5V IO = 10V R RC = 10–5 SEC R (TRIM FOR CALIBRATION) VIN VO VIN VO VO = 0V TO 25V 1 2 Figure 20. Precision Current Source SUPPLY BYPASSING For best results, it is recommended that the power supply pin be bypassed with a 0.1 µF disc ceramic capacitor. REFERENCE STACK WITH EXCELLENT LINE REGULATION Three REF01s can be stacked to yield 10 V, 20 V, and 30 V outputs. An additional advantage is near-perfect line regulation of the 10.0 V and 20.0 V output. A 32 V to 60 V input change produces an output change that is less than the noise voltage of the devices. A load bypass resistor (RB) provides a path for the supply current (ISY) of the 20 V regulator. In general, any number of REF01s can be stacked this way. For example, 10 devices will yield outputs of 10 V, 20 V, 30 V . . . 100 V. The line voltage can change from 105 V to 130 V. However, care must be taken to ensure that the total load currents do not exceed the maximum usable current (typically 21 mA). GND REF01 GND REF01 GND REF01 TRIM TRIM 10k Ω 10k Ω RB 6.8k Ω 10k Ω 2 6 5 4 2 6 5 4 2 6 5 4 30V 20V 10V TRIM 32V TO 60V TRIMMED OUTPUTS VIN VO VIN VO VIN VO Figure 21. Reference Stack |
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