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1 Features

? Low temperature drift (maximum):

– Enhanced-grade: 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 280μA. 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.