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REF5020AQDRQ1 Datasheet(PDF) 9 Page - Texas Instruments |
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REF5020AQDRQ1 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 17 page  APPLICATION INFORMATION USING THE TRIM/NR PIN R5 60kW REF50xx TEMP V OUT GND TRIM/NR V IN aT aT (10 A m at+25 C) ° R2 R1 R3 R4 10kW 1kW 1.2V BASIC CONNECTIONS DNC TEMP V OUT V IN GND DNC NC TRIM/NR REF50xx +V SUPPLY 10kW 1kW 470W DNC TEMP V OUT V IN GND DNC NC TRIM/NR REF50xx C BYPASS 1 Fto10 F m m C L 1 Fto50 F m m +V SUPPLY V OUT SUPPLY VOLTAGE DNC TEMP V OUT V IN GND DNC NC TRIM/NR REF50xx C1 1 F m +V SUPPLY REF5020-Q1, REF5025-Q1, REF5030-Q1 REF5040-Q1, REF5045-Q1, REF5050-Q1 www.ti.com ............................................................................................................................................... SBOS456B – SEPTEMBER 2008 – REVISED APRIL 2009 The REF50xx is family of low-noise, precision requirement of 2.7 V, these references can be bandgap voltage references that are specifically operated with a supply of 200 mV above the output designed for excellent initial voltage accuracy and voltage in an unloaded condition. For loaded drift. Figure 22 shows a simplified block diagram of conditions, a typical dropout voltage versus load plot the REF50xx. is shown in Figure 6 of Typical Characteristics. 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 24 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 22. REF50xx Simplified Block Diagram Figure 23 shows the typical connections for the REF50xx. A supply bypass capacitor ranging between 1 µF to 10 µF is recommended. A 1-µF to 50- µF, low-ESR output capacitor (C L) must be connected from VOUT to GND. The ESR value should Figure 24. VOUT Adjustment Using TRIM/NR Pin be less than or equal to 1.5 Ω. The ESR minimizes gain peaking of the internal 1.2-V reference and thus The REF50xx allows access to the bandgap through reduces noise at the VOUT pin. the TRIM/NR pin. Placing a capacitor from the TRIM/NR pin to GND (as Figure 25 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 23. Basic Connections The REF50xx family of voltage references features extremely low dropout voltage. With the exception of the REF5020, which has a minimum supply Figure 25. Noise Reduction Using TRIM/NR Pin Copyright © 2008–2009, Texas Instruments Incorporated Submit Documentation Feedback 9 |
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