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ADR444ARZ
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Product Detailed Parameters
- Description：IC VREF SERIES 0.13% 8SOIC
- Series：XFET®
- Mfr：Analog Devices Inc.
- Package：Tube
- Output Type：Fixed
- Voltage - Output (Min/Fixed)：4.096V
- Voltage - Output (Max)：-
- Current - Output：10 mA
- Operating Temperature：-40°C ~ 125°C (TA)
- Mounting Type：Surface Mount
- Package / Case：8-SOIC (0.154", 3.90mm Width)
- Supplier Device Package：8-SOIC
- Grade：-
- Qualification：-
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Overview
The ADR444ARZ is an ultralow noise, low dropout (LDO) XFET voltage reference with a fixed output of 4.096 V. It features an initial accuracy of ±5 mV (±0.13%) and a temperature coefficient of 10 ppm/°C for the A grade. The device operates over a supply voltage range of 4.6 V to 18 V with a minimum headroom of 500 mV. It provides high output current capability, sourcing up to +10 mA and sinking up to −5 mA. Quiescent current is typically 3.75 mA across the operating temperature range of −40°C to +125°C.
Feature Summary
- Utilizes patented XFET technology to minimize voltage change versus temperature nonlinearity.
- Offers ultralow noise performance in the 0.1 Hz to 10 Hz frequency band.
- Includes a dedicated TRIM pin for adjusting output voltage without compromising performance.
- Supports both sourcing (+10 mA) and sinking (−5 mA) load currents.
Applications
- Precision data acquisition systems
- High resolution data converters
- Battery-powered instrumentation
- Portable medical instruments
- Industrial process control systems
Procurement Notes
Verify the specific electrical grade (A or B) required for your application, as the suffix ARZ indicates the package type but not the performance grade. Confirm that the input voltage range meets the minimum headroom requirements for the selected load conditions. Ensure proper decoupling capacitors are used as specified in the datasheet to maintain stability.
Selection Notes
Select this component when ultralow noise and high precision are critical for signal integrity. The A grade offers broader availability and standard accuracy specifications suitable for most industrial applications. Consider the thermal resistance and power dissipation if operating at maximum load currents or elevated ambient temperatures.
Part Context
The ADR444ARZ belongs to the ADR44x series of XFET voltage references from Analog Devices. This family shares common architectural features including low dropout operation and trim capabilities. The ARZ suffix specifically denotes the 8-lead narrow SOIC package format, distinguishing it from MSOP variants.
Replacement Considerations
ADR444BRZ
FAQ
What is the function of the TRIM pin on the ADR444ARZ?
The TRIM pin allows the user to adjust the output voltage over a limited range (±0.5%) to compensate for system errors. It should be connected to a potentiometer between the output and ground.
How does the ADR444ARZ handle load transients?
The device can source up to 10 mA and sink up to 5 mA. It maintains regulation within specified load regulation limits during transient changes in load current.
