What Is ADR02ARZ?
ADR02ARZ is a 5.0 V precision bandgap voltage reference IC developed by Analog Devices (ADI) and belongs to the ADR02 series. It provides a stable reference voltage over a wide supply voltage range, making it suitable for ADCs, DACs, precision measurement instruments, and industrial control systems.
ADR02ARZ comes in an 8-lead SOIC surface-mount package. It features a TRIM pin for fine adjustment of the output voltage. With an external buffer and a simple resistor network, the TEMP pin can also be used for temperature sensing and approximate temperature measurement. In addition, the 8-lead SOIC version of the ADR02 series can serve as a drop-in replacement for the industry-standard REF02, helping simplify the upgrade and design of certain existing circuits.
How Does ADR02ARZ Work?
ADR02ARZ operates based on bandgap voltage reference technology. It uses two bipolar junction transistors (BJTs) with different current densities to generate a proportional-to-absolute-temperature (PTAT) voltage. This is combined with the negative temperature coefficient of the transistor base-emitter voltage (VBE) to compensate for temperature variations, maintaining a stable reference voltage over a wide temperature range of −40°C to +125°C.
Once the bandgap circuit generates a stable reference voltage, an internal high-gain, low-noise operational amplifier and output driver regulate it to a standard 5.0V DC output. Precision thin-film resistors and laser trimming during manufacturing help achieve high initial accuracy and low temperature drift.
ADR02ARZ uses a series-reference topology and operates from an input supply of 7V to 30V. Its internal feedback loop adjusts the output driver to maintain a stable 5.0V output despite supply or load variations.
Technical Specifications
This section lists the key specifications of the ADR02ARZ voltage reference IC.
Parameter | Value |
Part Number | ADR02ARZ |
Manufacturer | ADI (Analog Devices, Inc.) |
Description | IC VREF SERIES 5V 8SOIC |
Lead Free Status / RoHS Status | Lead free / RoHS Compliant |
Output Type | Fixed |
Voltage - Output (Min/Fixed) | 5V |
Voltage - Input | 7 V ~ 36 V |
Noise - 0.1Hz to 10Hz | 10µVp-p |
Current - Supply | 1mA |
Temperature Coefficient | 10ppm/°C |
Current - Output | 10mA |
Tolerance | ±0.1% |
Mounting Type | Surface Mount |
Packaging | Tube |
Operating Temperature | -40°C ~ 125°C (TA) |
Supplier Device Package | 8-SOIC |
Package / Case | 8-SOIC (0.154, 3.90mm Width) |
Base Part Number | ADR02 |
Pin Configurations
Pin 1 (NIC): No internal connection; leave unconnected or connect to ground.
Pin 2 (VIN): Power supply input pin, accepts a DC voltage range of 7V to 30V.
Pin 3 (TEMP):Temperature monitor output pin, providing a voltage proportional to the absolute internal temperature.
Pin 4 (GND): System ground and power supply return.
Pin 5 (TRIM): Output voltage trim terminal for fine-tuning the voltage accuracy with an external potentiometer.
Pin6 (VOUT): Precision reference voltage output (5.0V regulated output for ADR02).
Pin 7 (NIC): No internal connection; leave unconnected or connect to ground.
Pin 8 (NIC): No internal connection; leave unconnected or connect to ground.
Simplified Schematic Diagram
The circuit illustrates the core architecture of the ADR02ARZ. At the bottom, the Q18/Q19 transistor pair and precision resistor network form the bandgap reference core, generating a stable bandgap voltage (VBG) through complementary positive and negative temperature coefficients. The TEMP pin provides a voltage proportional to absolute temperature. At the top, the amplifier and Q9/Q10 output driver form a closed-loop feedback system, working with the R5/R6 network to regulate the output at 5 V through the (VO) pin. The TRIM pin also supports external fine adjustment of output accuracy.
Key Features and Advantages
l Ultracompact SC70 and TSOT packages
l Low temperature coefficient 8-lead SOIC: 3 ppm/°C typical
l Initial accuracy ±0.1%
l No external capacitor required
l Low noise 10 µV p-p, 0.1 Hz to 10.0 Hz (ADR02)
l Wide operating range: 7.0 V to 36.0 V
l High output current 10 mA
l Wide temperature range: −40°C to +125°C
l ADR02pin compatible to industrystandard REF02
l ADR02 SOIC (A grade) qualified for automotive applications
Application Fields
ADR02ARZ provides a stable 5.0 V precision reference voltage and is widely used in data acquisition, high-resolution converters, industrial control, and other applications.
1. Precision Data Acquisition Systems
In precision data acquisition systems, ADR02ARZ provides a stable reference voltage for ADCs, helping convert analog signals into digital signals accurately.
2. High-Resolution Converters
ADR02ARZ helps reduce conversion errors caused by reference voltage variations, making it suitable for precision signal processing and high-accuracy measurement circuits.
3. Industrial Process Control Systems
In industrial process control systems, sensors continuously monitor parameters such as temperature, pressure, and flow. ADR02ARZ helps control systems acquire data accurately, supporting process monitoring, feedback regulation, and automation.
4. Precision Instruments
ADR02ARZ offers high voltage stability and low temperature drift. It can be used in the reference voltage circuits of precision instruments to improve measurement accuracy.
5. Automotive Battery Monitoring
In automotive battery monitoring systems, ADR02ARZ provides a stable reference voltage for voltage sampling and signal conversion circuits, helping monitor battery voltage and related operating parameters.
6. PCMCIA Cards
In PCMCIA cards and other expansion devices, ADR02ARZ provides a stable reference voltage for analog signal acquisition, data conversion, and measurement circuits, helping improve data processing accuracy.
ADR02ARZ vs. ADR02ARZ-REEL7
The main difference between ADR02ARZ and ADR02ARZ-REEL7 is the packaging method, not the electrical performance. Both are manufactured by Analog Devices (ADI), provide a 5.0 V precision reference voltage, and come in an 8-lead SOIC package.
Parameter | ADR02ARZ | ADR02ARZ-REEL7 |
Output Voltage | 5.0 V | 5.0 V |
Initial Accuracy | ±0.1% | ±0.1% |
Temperature Coefficient | 10 ppm/°C | 10 ppm/°C |
Operating Temperature | −40°C ~125°C | −40°C ~125°C |
Package | 8-lead SOIC | 8-lead SOIC |
Packaging | Tube | 7-inch tape and reel |
Standard Order Quantity | 98 pieces | 1,000 pieces |
Which One Should You Choose?
l ADR02ARZ: Suitable for sample orders, small-batch testing, and manual assembly.
l ADR02ARZ-REEL7: Ideal for automated surface-mount assembly and high-volume production.
PCB Layout and Decoupling Best Practices
1. Decoupling Capacitors
Capacitor selection: Use 0.1 µF and 1–10 µF capacitors at the power supply and output.
Placement: Place the 0.1 µF capacitor within 3 mm of the pin.
Grounding: Connect capacitors to AGND with short traces.
2. Noise and Grounding
Grounding: Connect Pin 4 (GND) to AGND and separate it from switching and digital grounds.
Sensitive pins: Keep TRIM (Pin 5) and TEMP (Pin 3) traces short and away from clock signals. Leave TRIM unconnected when unused.
3. Stress and Thermal Management
Thermal relief: Use thermal-relief pads to reduce soldering stress.
PCB placement: Keep the IC away from board edges and mounting holes.
Package Details (SOIC-8)
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