REF50xx Low-Noise, Very Low Drift, Wide VIN Precision Voltage Reference

1 Features

• Low temperature drift (maximum):

– Enhanced-grade (new): 2.5ppm/°C

– High-grade: 3ppm/°C

– Standard-grade: 8ppm/°C

• High accuracy (maximum):

– Enhanced-grade: 0.025%

– High-grade: 0.05%

– Standard-grade: 0.1%

• Low noise:

– Enhanced-grade: 0.5μVPP/V

– High/standard-grade: 3μVPP/V

• Excellent long-term stability:

– 22ppm after first 1000 hours (SOIC-8)

– 50ppm after first 1000 hours (VSSOP-8)

• Wide input voltage support:

– Enhanced-grade: 42V

– High/standard-grade: 18V

• High-output current: ±10mA

• Temperature range: -40°C to 125°C

2 Applications

• Precision data acquisition systems

• Semiconductor test equipment

• Industrial process controls

• Medical instrumentation

• Pressure and temperature transmitters

• Lab and field instrumentation

3 Description

The REF50xx is a family of low-noise, low-drift, very

high precision voltage references. The references are

capable of both sinking and sourcing current, and

have excellent line and load regulation.

Achieve excellent temperature drift (2.5ppm/°C) and

high accuracy (0.025%) using proprietary design

techniques. These features, combined with very

low flicker noise (0.5μVPP/V), make the REF50xx

family an excellent choice for use in high-precision

data acquisition systems. REF50 family is available

in

enhanced

grade

(REF50xxEI),

high

grade

(REF50xxI), and standard grade (REF50xxAI). The

reference voltages are offered in 8-pin SOIC and

VSSOP packages and are specified from –40°C to

125°C.

For detailed comparison across various grades, refer

to Table 4-2.

Package Information

PART NUMBER

PACKAGE(1)

PACKAGE SIZE(2)

REF50xxI

REF50xxAI

D (SOIC, 8)

4.90mm × 3.91mm

DGK (VSSOP, 8)

3.00mm × 3.00mm

REF50xxEI

D (SOIC, 8)

4.90mm × 3.91mm

(1)

For all available packages, see the orderable addendum at

the end of the data sheet.

(2)

The package size (length × width) is a nominal value and

includes pins, where applicable.

OPA365

ADS8326

REF5040

Input Signal,

0 V to 4 V

5 V

R1

124 Ÿ

C1

1 nF

IN

IN

VDD

GND

REF

VIN

VOUT

GND

+5V

CBYPASS

1 µF

C2

22 µF

5 V

Copyright © 2016, Texas Instruments Incorporated

Simplified Schematic

REF50, REF50E

SBOS410O – JUNE 2007 – REVISED OCTOBER 2025

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.