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REF5010AIDR Datasheet(PDF) 10 Page - Texas Instruments |
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REF5010AIDR Datasheet(HTML) 10 Page - Texas Instruments |
10 / 28 page 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 DNC TEMP V OUT V IN GND DNC NC TRIM/NR REF50xx +V SUPPLY 10kW 1kW 470kW 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 DNC TEMP V OUT V IN GND DNC NC TRIM/NR REF50xx C1 1 F m +V SUPPLY REF5010, REF5020 REF5025, REF5030 REF5040, REF5045, REF5050 SBOS410E – JUNE 2007 – REVISED JUNE 2010 www.ti.com APPLICATION INFORMATION The REF50xx is family of low-noise, precision requirement of 2.7V, these references can be bandgap voltage references that are specifically operated with a supply of 200mV above the output designed for excellent initial voltage accuracy and voltage in an unloaded condition. For loaded drift. Figure 28 shows a simplified block diagram of conditions, a typical dropout voltage versus load plot the REF50xx. is shown in Figure 6 of the Typical Characteristics. 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 30 shows a typical circuit that allows an output adjustment of ±15mV Figure 28. REF50xx Simplified Block Diagram BASIC CONNECTIONS Figure 30. VOUT Adjustment Using the TRIM/NR Figure 29 shows the typical connections for the Pin REF50xx. A supply bypass capacitor ranging between 1mF to 10mF is recommended. A 1mF to The REF50xx allows access to the bandgap through 50mF output capacitor (CL) must be connected from the TRIM/NR pin. Placing a capacitor from the VOUT to GND. The ESR value of CL must be less than TRIM/NR pin to GND (see Figure 31) in combination or equal to 1.5 Ω to ensure output stability. To with the internal R3 and R4 resistors creates a minimize noise, the recommended ESR of CL is low-pass filter. A capacitance of 1mF creates a between 1 Ω and 1.5Ω. low-pass filter with the corner frequency between 10Hz and 20Hz. 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. Note that use of this capacitor increases startup time. Figure 29. Basic Connections SUPPLY VOLTAGE The REF50xx family of voltage references features extremely low dropout voltage. With the exception of Figure 31. Noise Reduction Using the TRIM/NR the REF5020, which has a minimum supply Pin 10 Submit Documentation Feedback Copyright © 2007–2010, Texas Instruments Incorporated Product Folder Link(s): REF5010 REF5020 REF5025 REF5030 REF5040 REF5045 REF5050 |
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