REF80 Temperature-Controlled Buried Zener Reference with 0.05ppm/°C Drift

and < 1ppm Stability

1 Features

• 7.6V ultra-precision reference with minimal number

of external components

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

• Excellent long term stability: 0.3ppm (1k hour to 5k

hour)

• Integrated heater with temperature stable indicator

• 1/f noise (0.1Hz to 10Hz) : 0.12ppmpk-pk

• 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 REF80 is a highly integrated ultra-low drift

buried zener precision voltage reference. The REF80

combines a precision 7.6V reference with an internal

heater to achieve extremely low temperature drift

of 0.05ppm/°C. The integrated heater maintains the

internal temperature of the die at a constant set

point. This helps the reference voltage stay constant

irrespective of ambient temperature variations. The

device internal temperature is pre-programmed to

eliminate design complexities. This allows for fast

design cycles, easy bring up and no dependence on

high-cost external precision components.

The REF80 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 0ppm (after setteling), critical

for applications that demand a long time period

without calibration. The package also offers excellent

immunity against humidity variation.

Device Information

PART NAME

PACKAGE (1)

BODY SIZE (NOM) (2)

REF80

LCCC (20)

8.89mm × 8.89mm

(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.

OP-STBL

VDD

T-SET

REF_Z

REF_GND

HEATP

HEATM

+30 V

10 V

5V

Stable Temp

Indicator

7.6V

REF80

1µF

1µF

10µF

REF80 Circuit Diagram

(With Supply and Passive Requirement)

Time (Hours)

0

1000

2000

3000

4000

5000

-15

-10

-5

0

5

10

15

Reference Voltage Drift Vs Time

REF80

SNAS856A – SEPTEMBER 2024 – 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.