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REF02AZ Datasheet(PDF) 10 Page - Analog Devices |
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REF02AZ Datasheet(HTML) 10 Page - Analog Devices |
10 / 16 page REF02 Rev. F | Page 10 of 16 OUTPUT ADJUSTMENT The REF02 trim terminal can be used to adjust the output voltage over a 5 V ±300 mV range. This feature lets the system designer trim system errors by setting the reference to a voltage other than 5 V. The output also can be set to exactly 5.000 V or to 5.12 V for binary applications. VIN GND TRIM TEMP VO REF02 15V 3 2 6 5 4 OUTPUT 10k Ω Figure 14. Output Adjustment Circuit Adjustment of the output does not significantly affect the temperature performance of the device. The temperature coefficient change is approximately 0.7 ppm/°C for 100 m V of output adjustment. VIN GND –18V +18V 4 2 REF02 Figure 15. Burn-In Circuit VIN GND REF02 VO TRIM TEMP 0.1 µF 5k Ω OP02 10k Ω 10k Ω +15V –15V +15V +5V –5V 4 5 3 6 2 Figure 16. ±5 V Reference REF02 R1 5.6k Ω R2 5.6k Ω 2 +5V 4 6 2 OP02 – + 3 4 6 7 –9V VREF VO+ +2.5V +VO –2.5V VO+ = (VREF), R1 R1 + R2 VO– = (VREF) R2 R1 + R2 Figure 17. ±2.5 V Reference TEMPERATURE MONITORING As described previously, the REF02 provides a TEMP output (Pin 3) that varies linearly with temperature. This output can be used to monitor the temperature change in the system. The voltage at VTEMP is approximately 550 mV at 25°C, and the temperature coefficient is approximately 1.96 mV/°C (see Figure 18). 850 800 750 700 650 600 550 500 450 400 –50 –25 0 25 50 75 100 125 TEMPERATURE ( °C) ∆VTEMP/∆T = 1.96mV/°C VIN = 9V SAMPLE SIZE = 6 J, S, AND P PACKAGES Z PACKAGE AND 833 PRODUCT ∆VTEMP/∆T = 2.1mV/°C Figure 18. Voltage at TEMP Pin vs. Temperature A voltage change of 39.2 mV at the TEMP pin corresponds to a 20°C change in temperature. The TEMP function is provided as a convenience rather than a precise feature. Since the voltage at the TEMP node is acquired from the band gap core, current pulling from this pin will have a significant effect on VOUT. Care must be taken to buffer the TEMP output with a suitable low bias current op amp, such as the AD8601, AD820, or OP1177 (all of which would result in less than a 100 V change in ΔVOUT) See Figure 19. Without buffering, even tens of microamps drawn from the TEMP pin can cause VOUT to fall out of specification. |
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