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. These references

are capable of both sinking and sourcing current, and

have excellent line and load regulation.

Excellent temperature drift (2.5ppm/°C) and high

accuracy (0.025%) are achieved 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.

The REF50xxEI supports wide supply voltage rating

of 42V with ultra-low IQ of 340μA. The wide supply

range allows for direct connection to the battery or

field supply. This also protects the device in case of

power supply IC failure.

Device Information

PART NUMBER

PACKAGE (1)

BODY SIZE (NOM)

(2)

REF50xxI ,

REF50xxAI

SOIC (8)

4.90mm × 3.91mm

VSSOP (8)

3.00mm × 3.00mm

REF50xxEI

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

SBOS410N – JUNE 2007 – REVISED MARCH 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.