ADR444ARMZ-REEL7

Overview

The ADR444ARMZ-REEL7 is an ultralow noise, LDO XFET voltage reference with a nominal output of 4.096 V. It operates within an input range of 4.6 V to 18 V and requires a minimum headroom of 500 mV. The device provides a source current of up to 10 mA and a sink current of up to -5 mA. Quiescent current is typically 3.75 mA. Initial accuracy is ±5 mV (±0.13%), and the temperature coefficient is 10 ppm/°C for the A grade. Noise is 1.8 µV p-p from 0.1 Hz to 10 Hz. It functions over an extended industrial temperature range of −40°C to +125°C.

Feature Summary

• Utilizes XFET technology to minimize voltage change versus temperature nonlinearity.
• Features ultralow noise performance suitable for precision signal conversion applications.
• Capable of sourcing up to 10 mA and sinking up to -5 mA of output current.
• Includes a trim terminal allowing output voltage adjustment over a 0.5% range.

Applications

• Precision data acquisition systems
• High resolution data converters
• Battery-powered instrumentation
• Portable medical instruments
• Optical control circuits

Procurement Notes

Verify the specific electrical grade (A or B) required for your application, as initial accuracy and temperature coefficients differ between grades. Confirm that the MSOP-8 package variant matches your PCB footprint requirements. Ensure the input voltage supply meets the minimum headroom specification relative to the 4.096 V output to maintain regulation. Check datasheet limits for maximum power dissipation if operating at high ambient temperatures.

Selection Notes

Select this component when low noise and high stability are critical for analog-to-digital conversion stages. The 4.096 V output aligns with standard ADC reference voltages. Consider the A grade for general precision needs or the B grade if tighter drift specifications are mandatory. Evaluate thermal resistance values if significant power dissipation is expected in the MSOP-8 package.

Part Context

This part belongs to the ADR44x series of XFET voltage references manufactured by Analog Devices. The family includes variants with outputs ranging from 2.048 V to 5.000 V. All members share similar architectural features, including low dropout operation and ultralow noise characteristics. The suffix 'ARMZ' indicates the MSOP-8 package and RoHS compliance.

Replacement Considerations

Other models in the ADR44x family (ADR440, ADR441, ADR443, ADR445) offer different fixed output voltages but share identical pinouts and functional characteristics. Verify that the replacement part's output voltage matches the system requirement before substitution.