Design tool
REF81-DESIGN-TOOL — REF81 datasheet and EVM
Temperature Controlled Precision Voltage Reference with 0.05ppm/°C Temperature Drift and < 1ppm Stability
REF81
Temperature-controlled buried-Zener reference with 0.05ppm/°C drift and <1ppm stability
Data sheet
REF81
- 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)
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.
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Technical documentation
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View all 2 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | REF81 Temperature Controlled Precision Voltage Reference with 0.05ppm/°C Temperature Drift and < 1ppm Stability datasheet | PDF | HTML | 29 Jul 2025 |
| Technical article | The benefits of extreme precision from buried Zener technology in calibration (Rev. B) | PDF | HTML | 26 Sep 2025 |
Design & development
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Evaluation board
REF81EVM — REF81 evaluation module
The REF81EVM is a precision voltage reference evaluation module that demonstrates the performance of high precision series reference device (REF81) and its internal heater. The REF81 is a family of low drift and low noise buried zener and nternal heater compensated voltage reference devices which (...)
Simulation tool
PSPICE-FOR-TI — PSpice? for TI design and simulation tool
PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Reference designs
TIDA-010970 — Low-noise, highly linear, analog front-end reference design
The target application for this design includes digital multimeters (DMMs) that require ultra-high precision to measure dc signals. This design achieves effective dc accuracy using the ADS127L21B, a high-performance, 24-bit analog-to-digital converter (ADC) with effective linearity. An ultra-low (...)
Design guide: PDF
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| LCCC (NAJ) | 20 | Ultra Librarian |
Ordering & quality
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