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REF02BU Datasheet(PDF) 7 Page - Texas Instruments |
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REF02BU Datasheet(HTML) 7 Page - Texas Instruments |
7 / 15 page REF02 7 SBVS003B www.ti.com OUTPUT ADJUSTMENT The REF02 trim terminal can be used to adjust the voltage over a 5V ±150mV range. This feature allows the system designer to trim system errors by setting the reference to a voltage other than 5V, including 5.12V(1) for binary applica- tions (see circuit on page 1). Adjustment of the output does not significantly affect the temperature performance of the device. The temperature coefficient change is approximately 0.7ppm/ °C for 100mV of output adjustment. NOTE: (1) 20mV LSB for 8-bit applications. TYPICAL APPLICATIONS 5k Ω OPA177 10k Ω 10k Ω –15V +15V –5V +5V Trim GND V IN 35 4 2 REF02 0.1 µF V O Temp 6 FIGURE 2. ±5V Precision Reference. REF02 GND 2 4 –18V +18V V IN FIGURE 1. Burn-In Circuit. REFERENCE STACKING PROVIDES OUTSTANDING LINE REGULATION By stacking two REF01s and one REF02, a systems designer can achieve 5V, 15V, and 25V outputs. One very important advantage of this circuit is the near-perfect line regulation at 5V and 15V outputs. This circuit can accept a 27V to 55V change to the input with less than the noise voltage as a change to the output voltage. R B, a load bypass resistor, supplies current I SY for the 15V regulator. Any number of REF01s and REF02s can be stacked in this configuration. For example, if ten devices are stacked in this configuration, ten 5V or five 10V outputs are achieved. The line voltage may range from 100V to 130V. Care should be exercised to insure that the total load currents do not exceed the maximum usable current, which is typically 21mA. |
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