Overview

The Texas Instruments REF5020AID is a precision voltage reference device that provides an ultra-stable 2.0 V output voltage with exceptional accuracy and low noise characteristics. It is designed for applications requiring a highly stable reference voltage such as data acquisition systems, precision measurement instruments, and analog-to-digital converters (ADCs). The device offers excellent temperature stability, low temperature drift, and high initial accuracy, making it suitable for use in demanding environments.

Key Features

* Fixed output voltage of 2.0 V with tight initial accuracy typically ±0.05%
* Low temperature coefficient of about 2 ppm/°C, ensuring minimal drift over temperature range
* Low noise output voltage (typical noise density ~1.8 μV RMS over 0.1 Hz to 10 Hz)
* Low supply current typically around 180 μA, making it suitable for battery-powered systems
* Wide operating voltage range from 4.5 V to 36 V, allowing flexible power supply options
* Excellent line regulation typically 0.1 ppm/V
* Good load regulation performance, supporting stable operation under varying load currents
* Output current capability up to 10 mA, sufficient for driving external circuits or ADC references
* Internal temperature compensation and trimmed circuits to improve accuracy and stability
* Built-in short-circuit protection to prevent device damage during abnormal conditions
* Available in small SOT-23-5 surface-mount package for compact PCB layout

Electrical Characteristics

* Output voltage (V\_OUT): 2.0 V nominal
* Initial accuracy: ±0.05% typical (±0.1% maximum)
* Temperature coefficient (TC): 2 ppm/°C typical
* Noise voltage: Approximately 1.8 μV RMS (0.1 Hz to 10 Hz bandwidth)
* Supply voltage range (V\_IN): 4.5 V to 36 V
* Quiescent current (I\_Q): Typically 180 μA
* Line regulation: 0.1 ppm/V typical
* Load regulation: 0.3 ppm/mA typical
* Output current (I\_OUT): Up to 10 mA continuous

Functional Description

The REF5020AID utilizes a bandgap voltage reference core combined with precision trimming and temperature compensation circuitry. This design approach results in a low-drift, low-noise voltage reference ideal for precise analog systems. The device maintains a constant output voltage regardless of changes in input voltage, temperature variations, and load current fluctuations, providing reliable and consistent performance.

Its low noise and high stability make it particularly suited for high-resolution ADCs where voltage reference accuracy directly impacts measurement precision. The wide input voltage range offers flexibility to designers in selecting power sources.

Typical Applications

* High-accuracy data acquisition systems and instrumentation
* Precision analog-to-digital and digital-to-analog converters
* Medical instrumentation and sensor interfaces
* Industrial process control and automation systems
* Portable battery-operated equipment requiring stable references
* Calibration standards and metrology equipment

Package and Mechanical Information

The REF5020AID is housed in a compact SOT-23-5 package which is popular in space-constrained designs. The small form factor combined with surface-mount technology simplifies automated assembly and reduces PCB area. The device’s package also ensures reliable thermal dissipation under typical operating conditions.

Design Considerations

When designing with the REF5020AID, it is important to provide proper decoupling capacitors close to the device pins to minimize noise and improve transient response. Attention should be paid to the layout to reduce interference and maintain the integrity of the reference voltage. Although the device can supply up to 10 mA, the load should be kept within specified limits to ensure the stability and accuracy of the output.

Thermal considerations and operating environment should be accounted for, as temperature extremes can affect device performance despite excellent compensation.

Summary of Specifications

| Parameter | Specification |
| ----------------------- | ------------------------------ |
| Output voltage | 2.0 V nominal |
| Initial accuracy | ±0.05% typical (±0.1% max) |
| Temperature coefficient | 2 ppm/°C typical |
| Noise voltage | ~1.8 μV RMS (0.1 Hz to 10 Hz) |
| Supply voltage range | 4.5 V to 36 V |
| Quiescent current | ~180 μA |
| Line regulation | 0.1 ppm/V typical |
| Load regulation | 0.3 ppm/mA typical |
| Output current | Up to 10 mA continuous |
| Package | SOT-23-5 |

The REF5020AID provides a highly accurate, low-noise, and temperature-stable 2.0 V voltage reference solution. Its robust electrical characteristics and compact packaging make it an excellent choice for precision analog system designs requiring reliable voltage references over a wide range of operating conditions.