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REF5050AQDRQ1 Datasheet(PDF) 10 Page - Texas Instruments |
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REF5050AQDRQ1 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 21 page Drift + V OUTMAX * VOUTMIN V OUT Temp Range 106(ppm) DNC TEMP V OUT V IN GND DNC NC TRIM/NR REF50xx C1 1 F m +V SUPPLY DNC TEMP V OUT V IN GND DNC NC TRIM/NR REF50xx +V SUPPLY 10kW 1kW 470W REF5020-Q1, REF5025-Q1, REF5030-Q1 REF5040-Q1, REF5045-Q1, REF5050-Q1 SBOS456G – SEPTEMBER 2008 – REVISED OCTOBER 2013 www.ti.com USING THE TRIM/NR PIN The REF50xx provides a very accurate voltage output. However, VOUT can be adjusted to reduce noise and shift the output voltage from the nominal value by configuring the trim and noise reduction pin (TRIM/NR, pin 5). The TRIM/NR pin provides a ±15-mV adjustment of the device bandgap, which produces a ±15-mV change on the VOUT pin. Figure 27 shows a typical circuit using the TRIM/NR pin to adjust VOUT. When using this technique, the temperature coefficients of the resistors can degrade the temperature drift at the output. Figure 27. VOUT Adjustment Using TRIM/NR Pin The REF50xx allows access to the bandgap through the TRIM/NR pin. Placing a capacitor from the TRIM/NR pin to GND (as Figure 28 illustrates) in combination with the internal 1-k Ω resistor creates a low-pass filter that lowers the overall noise measured on the VOUT pin. A capacitance of 1 μF is suggested for a low-pass filter with a corner frequency of 14.5 Hz. Higher capacitance results in a lower cutoff frequency. Figure 28. Noise Reduction Using TRIM/NR Pin TEMPERATURE DRIFT The REF50xx is designed for minimal drift error, which is defined as the change in output voltage over temperature. The drift is calculated using the box method, as described by the following equation: (1) The REF50xx features a maximum drift coefficient of 8 ppm/°C for the standard-grade. 10 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated |
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