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REF5020MDREP Datasheet(PDF) 10 Page - Texas Instruments |
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REF5020MDREP Datasheet(HTML) 10 Page - Texas Instruments |
10 / 29 page DNC TEMP V OUT V IN GND DNC NC TRIM/NR REF50xx +V SUPPLY 10kW 1kW 470kW 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 REF5020-EP, REF5025-EP, REF5040-EP, REF5050-EP SBOS471B – APRIL 2010 – REVISED JUNE 2015 www.ti.com 7 Detailed Description 7.1 Overview The REF50xx devices are low-noise, low-drift, very high precision voltage references. These references can both sink and source, and are very robust with regard to line and load changes. 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Output Adjustment Using The TRIM/NR Pin The REF50xx provides a very accurate, factory-trimmed voltage output. However, VOUT can be adjusted using the trim and noise reduction pin (TRIM/NR, pin 5). Figure 22 shows a typical circuit that allows an output adjustment of ±15 mV Figure 22. VOUT Adjustment Using the 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 (see Figure 24) in combination with the internal R3 and R4 resistors creates a low-pass filter. A capacitance of 1 μF creates a low-pass filter with the corner frequency between 10 Hz and 20 Hz. Such a filter decreases the overall noise measured on the VOUT pin by half. Higher capacitance results in a lower filter cutoff frequency, further reducing output noise. Use of this capacitor increases start-up time. 10 Submit Documentation Feedback Copyright © 2010–2015, Texas Instruments Incorporated Product Folder Links: REF5020-EP REF5025-EP REF5040-EP REF5050-EP |
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