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REF102CU Datasheet(PDF) 6 Page - Burr-Brown (TI) |
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REF102CU Datasheet(HTML) 6 Page - Burr-Brown (TI) |
6 / 15 page REF102 6 SBVS022A www.ti.com INSTALLATION AND OPERATING INSTRUCTIONS BASIC CIRCUIT CONNECTION Figure 2 shows the proper connection of the REF102. To achieve the specified performance, pay careful attention to layout. A low resistance star configuration will reduce voltage errors, noise pickup, and noise coupled from the power supply. Commons should be connected as indicated, being sure to minimize interconnection resistances. OPTIONAL OUTPUT VOLTAGE ADJUSTMENT Optional output voltage adjustment circuits are shown in Figures 3 and 4. Trimming the output voltage will change the voltage drift by approximately 0.008ppm/ °C per mV of trimmed voltage. In the circuit in Figure 3, any mismatch in TCR between the two sections of the potentiometer will also affect drift, but the effect of the ∆TCR is reduced by a factor of five by the internal resistor divider. A high quality potentiometer, with good mechanical stability, such as a cermet, should be REF102 1 µF Tantalum + R L 1 R L 2 R L 3 V+ (1) 2 (2) (2) (1) 4 6 NOTES: (1) Lead resistances here of up to a few ohms have negligible effect on performance. (2) A resistance of 0.1 Ω in series with these leads will cause a 1mV error when the load current is at its maximum of 10mA. This results in a 0.01% error of 10V. FIGURE 2. REF102 Installation. REF102 1 µF Tantalum + V+ 2 4 20k Output Voltage Adjust Minimum range ( ±300mV) and minimal degradation of drift. Ω +10V 5 V TRIM 6 V OUT FIGURE 3. REF102 Optional Output Voltage Adjust. REF102 V+ 2 4 20k Output Voltage Adjust Higher resolution, reduced range (typically ±25mV). Ω +10V 5 V TRIM 6 V OUT R S 1M Ω 1 µF Tantalum + FIGURE 4. REF102 Optional Output Voltage, Fine Adjust. used. The circuit in Figure 3 has a minimum trim range of ±300mV. The circuit in Figure 4 has less range but provides higher resolution. The mismatch in TCR between RS and the internal resistors can introduce some slight drift. This effect is minimized if RS is kept significantly larger than the 50kΩ internal resistor. A TCR of 100ppm/ °C is normally sufficient. |
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Similar Description - REF102CU |
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