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.