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 trim and noise reduction pin (TRIM/NR, pin 5). Figure 22 shows a typical circuit that allows an output

adjustment of ±15 mV

The REF50xx allows access to the bandgap through the TRIM/NR pin. Placing a capacitor from the TRIM/NR pin

capacitance of 1

μF creates a low-pass filter with the corner frequency between 10 Hz and 20 Hz. Such a filter

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