New Content (1)
Features and Benefits
- 7.05 V ultrastable shunt reference
- Low temperature coefficient: 0.2 ppm/°C
- Maximum dynamic impedance: 0.08 Ω
- Typical reference noise for 10 Hz < f < 1 kHz: 1.84 μV rms
- Initial accuracy range: –300 mV to +250 mV
- Available in 4-lead TO-46 metal can
- External thermal insulator provided
- Upgrade path for legacy LM399
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 much 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 configuration is shown in Figure 1.
|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|
- Precision voltage reference for multimeters
- Calibration equipment voltage standards
- Laboratory measurement equipment
- Industrial monitor and control instrumentation
- Ultrastable data convertors
Markets and Technologies
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
The ADR1399H-EBZ allows the evaluation of the ADR1399KHZ, ultra-stable 7.05V Shunt Voltage Reference in 4-lead TO-46 package.
The DUT 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 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.
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.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.