ADR1399

RECOMMENDED FOR NEW DESIGNS

Oven-Compensated, Buried Zener, 7.05 V Voltage Reference

Data Sheet (Rev. A) Product Selection Table

Part Models: 2
1ku List Price: Starting From $10.99

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Part Details

7.05 V ultrastable shunt reference
Low temperature coefficient: 0.2 ppm/℃
Available in 4-pin TO-46 and 8-terminal LCC
Typical reference noise for 10 Hz < f < 1 kHz: 1.84 μV rms
Initial accuracy range: –300 mV to +250 mV

Low dynamic impedance: 0.04 Ω in TO-46, 0.011 Ω in LCC
External thermal insulator provided for TO-46
Upgrade path for legacy LM399, now also in surface-mount technology (SMT)

The ADR1399 precision shunt reference features excellent temperature stability over a wide range of voltage, temperature, and quiescent current conditions. A temperature stabilizing loop is incorporated with the active Zener on a monolithic substrate, which nearly eliminates changes in voltage with temperature. The subsurface Zener circuit is fully specified at a quiescent current I_REF of 3 mA and offers minimal noise (1.44 μV p-p, 0.1 Hz to 10 Hz) and excellent long-term stability (7 ppm/√kHr). The ADR1399 offers a lower output dynamic impedance (0.08 Ω) than the LM399, reducing the effects of shunt resistor (R_SHUNT) and the supply voltage variation on the reference output.

Ideal applications for the ADR1399 include ultrastable digital voltmeters, precision calibration equipment, and ultrarepeatable analog-to-digital converters (ADCs). The simplicity of the basic pin configurations is shown in Figure 1. The 8-terminal LCC version offers force and sense pins for lower dynamic impedance and for Kelvin sensing.

Table 1. Related Products
Model	Output Voltage (V)	Initial Accuracy Range (mV)
ADR1399	7.05	–300 to +250
LTZ1000	7.2	–200 to +300
LM399	6.95	–200 to +350
LT1236	5 and 10	–2.5 to +2.5

APPLICATIONS

Precision voltage reference for multimeters
Calibration equipment voltage standards
Laboratory measurement equipment
Industrial monitor and control instrumentation
Ultrastable data convertors

Part Models: 2
1ku List Price: Starting From $10.99

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
ADR1399KEZ	8-Lead LCC (5mm x 5mm)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
ADR1399KHZ	4-Lead TO-46	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Mar 4, 2022 - 22_0025 Implement Laser Top Mark for TO Metal Can Packages Assembled in Team Pacific Corporation.
		PCN22_0025_Form Material_Report Detailed Parts List
ADR1399KEZ	PRODUCTION
ADR1399KHZ	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Tools & Simulations

LTspice 1

ADR1399 - Voltage References

Models for the following parts are available in LTspice:

ADR1399E
ADR1399H

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

Evaluation Board for the ADR1399 Ultra Stable Shunt Voltage Reference

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Features and Benefits

Enables efficient prototyping
User defined circuit configuration
Edge mounted SMA connector
Simple connection to test equipment and other circuits
RoHS compliant

Product Details

The ADR1399E-EBZ and ADR1399H-EBZ allow the evaluation of the ADR1399KEZ, ultra-stable 7.05V Shunt Voltage Reference. The ADR1399E-EBZ is in 8-Pin LCC package and the ADR1399H-EBZ is in 4-lead TO-46 package.

The DUT on the ADR1399E-EBZ is on a paddle shaped “island” area of PCB for less stress from board flexure and also for thermal isolation. It is inside a captive acrylic enclosure to reduce air flow and further improve thermal isolation. Ground planes are removed under the DUT except for a hatch ground on the bottom side, again to prevent excessive thermal conduction away from the oven-ized reference. On L2 there is a small solid copper area under the reference voltage pins to help ensure an isothermal environment.

The DUT on the ADR1399H-EBZ is elevated on its leads in order to increase the thermal isolation from the 4-layer board ground planes.

Isolated power means that the Reference output is effectively floated, removing the likelihood of ground loops. The isolation is bridged only by a 1Meg resistor. Power may be supplied via the USB-C cable, or 5V may be applied to “VUSB”, or power may be back driven onto the LTM8048 regulator outputs at “VPRE” or V+”. The ultra-stable 7.05V is brought out to both banana jacks and to an edge mounted SMA connector.

Resources

ADR1399E-EBZ User Guide

ADR1399H-EBZ User Guide

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