ADR1399
Oven-Compensated, Buried Zener, 7.05 V Voltage Reference
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Features
- 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)
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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 IREF 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 (RSHUNT) 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.
| 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
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ADR1399
Documentation
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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)
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| ADR1399KHZ |
4-Lead TO-46
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- ADR1399KEZ
- Pin/Package Drawing
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8-Lead LCC (5mm x 5mm)
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Material Declaration
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HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
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SamacSys
- ADR1399KHZ
- Pin/Package Drawing
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4-Lead TO-46
- Documentation
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HTML
Material Declaration
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HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
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Ultra Librarian
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SamacSys
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Part Models
Product Lifecycle
PCN
Mar 4, 2022
- 22_0025
Implement Laser Top Mark for TO Metal Can Packages Assembled in Team Pacific Corporation.
ADR1399KEZ
PRODUCTION
ADR1399KHZ
PRODUCTION
Filter by Model
Part Models
Product Lifecycle
PCN
Mar 4, 2022
- 22_0025
Implement Laser Top Mark for TO Metal Can Packages Assembled in Team Pacific Corporation.
ADR1399KEZ
PRODUCTION
ADR1399KHZ
PRODUCTION
Software & Part Ecosystem
Evaluation Kits 1
EVAL-ADR1399
Evaluation Board for the ADR1399 Ultra Stable Shunt Voltage Reference
Product Detail
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
Tools & Simulations 1
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.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.
Lt Spice
