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REF5020A-Q1 Datasheet(PDF) 11 Page - Texas Instruments |
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REF5020A-Q1 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 25 page DNC TEMP V OUT V IN GND DNC NC TRIM/NR REF50xxA-Q1 +V SUPPLY 10 k 1 k 470 R5 60 k REF50xxA-Q1 TEMP V OUT GND TRIM/NR V IN αT αT (10 µA at 25°C) R2 R1 R3 R4 10 k 1 k 1.2 V REF5020A-Q1, REF5025A-Q1, REF5030A-Q1 REF5040A-Q1, REF5045A-Q1, REF5050A-Q1 www.ti.com SBOS456H – SEPTEMBER 2008 – REVISED FEBRUARY 2015 8 Detailed Description 8.1 Overview The REF50xxA-Q1 family of devices is a low-noise, precision-bandgap voltage reference that is specifically designed for excellent initial voltage accuracy and drift. See the Functional Block Diagram section for a simplified block diagram of the REF50xxA-Q1 family of devices. 8.2 Functional Block Diagram 8.3 Feature Description 8.3.1 Supply Voltage The REF50xxA-Q1 family of voltage references features extremely low dropout voltage. With the exception of the REF5020A-Q1 device, which has a minimum supply requirement of 2.7 V, these references can operate with a supply of 200 mV above the output voltage in an unloaded condition. For loaded conditions, Figure 6 in the Typical Characteristics section shows a typical dropout voltage versus load plot. 8.3.2 Using the TRIM/NR Pin The REF50xxA-Q1 family of devices 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 25 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 25. VOUT Adjustment Using TRIM/NR Pin Copyright © 2008–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: REF5020A-Q1 REF5025A-Q1 REF5030A-Q1 REF5040A-Q1 REF5045A-Q1 REF5050A-Q1 |
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