1 Features

• Buried zener core 7.6V output

• Industry standard fixed output voltage

– 1X gain: 2.5V, 4.096V, 5V

– 2X gain: 5V, 8.192V, 10V

• No external buffer for 1X and 2X gain output

• Industry standard fixed output initial accuracy

– 1X gain: ±0.05%

– 2X gain: ±0.1%

• Ultra-low temperature drift: 0.05ppm/°C

• Operating temperature range: 0°C to 70°C

• Excellent long term stability: 0.3ppm (1khr to 5khr)

• 1/f noise (0.1Hz to 10Hz) : 0.15ppmpk-pk

• Integrated heater with temperature stable indicator

• Input Voltage range: 10V to 16.5V

• Heater supply range: 10V to 42V

• Hermetically sealed ceramic package (20 pin

LCCC)

2 Applications

• Parametric measurement unit

• Lab and field instrumentation

• Precision weight scales

• Battery test equipment

• Digital multimeter

• Source measurement unit

• Data acquisition

3 Description

The REF81 device utilizes precision buried zener

core with integrated heater to generate stable

7.6V. The device further integrates precision resistor

dividers and a buffer to offer industry standard

voltage references to drive precision data converters.

Integrated temperature control with an internal

heater enables the reference voltage stay constant

irrespective of ambient temperature variations

and achieve extremely low temperature drift of

0.05ppm/°C. The integration of control loop, precision

resistances and buffer enables ease of design and

eliminates need of external precision components.

The REF81 family is available in a 20-pin LCCC

package. The LCCC package is a hermetically

sealed ceramic package that enables ultra low

long-term stability specification of 1ppm, critical for

applications that demand a longer operational window

without calibration. The package also offers excellent

immunity against humidity variation.