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REF02CZ Datasheet(PDF) 11 Page - Analog Devices |
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REF02CZ Datasheet(HTML) 11 Page - Analog Devices |
11 / 16 page REF02 Rev. F | Page 11 of 16 TEMP TRIM GND U1 OP1177 V+ V– 15V U2 VO VOUT VIN VTEMP 1.9mV/ °C VIN REF02 Figure 19. Temperature Monitoring GND REF02 4 6 2 TEMP 3 CMP02 2 3 8 4 R6 1 7 R7 27k Ω R1 (9.2k Ω) R3 (1.3k Ω) R2 1.5k Ω R4 2.7k Ω R5 2.2k Ω V+ V– – + HEATING ELEMENT V+ (12V TO 32V) VIN VO (SEE NOTE 1) NOTES 1. REF02 SHOULD BE THERMALLY CONNECTED TO SUBSTANCE BEING HEATED. 2. NUMBERS IN PARENTHESES ARE FOR A SETPOINT TEMPERATURE OF 60 °C. 3. R3 = R1 || R2 || R6 Figure 20. Temperature Controller REFERENCE STACK WITH EXCELLENT LINE REGULATION GND REF02 GND REF02 GND REF02 TRIM TRIM 10k Ω 10k Ω RB 6.8k Ω 10k Ω 2 6 5 4 2 6 5 4 2 6 5 4 15V 10V 5V TRIM 27V TO 55V VIN VO VIN VO VIN VO Figure 21. Reference Stack PRECISION CURRENT SOURCE A current source with 35 V output compliance and excellent output impedance can be obtained using this circuit. REF02 keeps the line voltage and power dissipation constant in 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 will create a 20 ppm change (3 µV/V × 35 V/5 V) in output current over a 25 V range. For example, a 5 mA current source can be built (R = 1 kΩ) with 350 MΩ output impedance. Two REF01s and one REF02 can be stacked to yield 5.000 V, 15.000 V, and 25.000 V outputs. An additional advantage is near-perfect line regulation of the 5.0 V and 15.0 V output. A 27 V to 55 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 15.000 V regulator. GND REF02 GND REF02 OP02E C C R 2 2 2 6 6 7 3 4 6 4 4 +50V –5V IO = 5V R RO = 35V 20 ×10–6 × 5mA R (TRIM FOR CALIBRATION) VIN VO VIN VO VO = 0V TO 25V 1 2 In general, any number of REF01s and REF02s can be stacked this way. For example, 10 devices will yield 10 outputs in 5 V or 10 V steps. The line voltage can change from 100 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). Figure 22. Precision Current Source |
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