1. General Description & Features:

️· What it is: The REF02 is a precision, three-terminal voltage reference. It's designed for low-voltage, low-power applications where high accuracy and stability are required.
️· Key Features:
- Accuracy: High initial accuracy.
- Stability: Excellent long-term stability.
- Temperature Compensation: Provides a built-in temperature-dependent output (TEMP pin) that can be used for temperature sensing.
- Adjustability: The trim terminal allows adjustment of the output voltage (+300mV range).
- Versatile: Suitable for various applications like precision voltage standards, current sources, and temperature transducers.
- Low Power Consumption: Designed for efficient operation in battery-powered systems.
- Short-Circuit Protection: Built-in protection against short circuits.

2. Models & Specifications (Key Differences):

The REF02 family includes three models: REF02, REF02A, and REF02B. Here's a breakdown of the differences:

️· REF02: The standard model. Nominal output voltage of 5V.
️· REF02A: Nominal output voltage of 10V.
️· REF02B: Nominal output voltage of 5V, with extended temperature range.

3. Electrical Characteristics (Key Parameters - See Summary Table Below):

️· Output Voltage: 5V (REF02 & REF02B), 10V (REF02A)
️· Initial Accuracy: Expressed as a percentage of the output voltage. (Typically 0.025% - 0.05%)
️· Temperature Coefficient: How much the output voltage changes per degree Celsius. (Typically 5 ppm/°C)
️· Output Noise: Low output noise, suitable for sensitive analog circuits.
️· Quiescent Current: Low current consumption.
️· Temperature-Dependent Output (TEMP pin): Provides an output voltage proportional to absolute temperature (approximately 2.1 mV/°C).
️· Adjustability: Trim terminal for output voltage adjustment.
️· Short-Circuit Protection: Protection against short circuits.

4. Functional Diagram & Connection Diagram:

️· The datasheet provides diagrams illustrating the pinout and suggested connections for typical operating circuits.

5. Typical Operating Characteristics:

️· Line Regulation: Output voltage stability vs. input voltage variation.
️· Load Regulation: Output voltage stability vs. load current variation.
️· Temperature Stability: Output voltage variation vs. temperature.
️· Noise Performance: Output noise vs. frequency.
️· Short Circuit Protection: The behavior of REF02 under short circuit conditions.
️· Output Change Due to Thermal Shock

6. Typical Applications:

️· Precision Calibration Standard: Used as a stable voltage reference for calibration applications.
️· ±10V Reference: Creating bipolar voltage references.
️· Current Source: Using the REF02 to generate precise current sources.
️· Precision Temperature Transducer: Measuring temperature remotely using the TEMP pin.

Summary Table of Key Parameters:

Parameter	REF02 (5V)	REF02A (10V)	REF02B (5V)
Nominal Output Voltage	5V	10V	5V
Initial Accuracy (max)	0.05%	0.05%	0.05%
Temperature Coefficient (max)	5 ppm/°C	5 ppm/°C	5 ppm/°C
Operating Temperature Range	0°C to 70°C	0°C to 70°C	-40°C to 70°C
Output Noise (0.1 Hz to 10 Hz)	2.5 µV	2.5 µV	2.5 µV
Quiescent Current	1.5 mA	2.5 mA	1.5mA
Output Voltage Adjustment Range	±300 mV	±300 mV	±300 mV

Key Takeaways:

️· The REF02 family is a versatile and accurate voltage reference solution.
️· Choose the correct model (REF02, REF02A, REF02B) based on the required output voltage and operating temperature range.
️· The TEMP pin provides a convenient way to measure temperature in remote applications.