The Texas Instruments REF1925AIDDCR is a high-precision, low-dropout (LDO) voltage reference designed to provide a stable, accurate reference voltage for various applications. It is part of the REF192x family and is widely used in systems requiring precise voltage regulation, such as analog-to-digital converters (ADCs), digital-to-analog converters (DACs), and precision measurement equipment. The REF1925AIDDCR provides an excellent choice for applications where both accuracy and stability are critical, ensuring reliable operation in a variety of circuits.

This device is designed for high-precision applications, offering features like low output voltage noise, low temperature coefficient, and a wide output voltage range, making it a versatile and reliable reference voltage source for demanding designs.

## Key Features

* High Precision: The REF1925AIDDCR is designed with a highly accurate voltage reference of 2.495V ±0.05%, offering superior precision for a variety of analog and digital applications.

* Low Output Voltage Noise: It exhibits low noise characteristics (typically 30 µVRMS), ensuring minimal interference in high-precision applications like ADCs, DACs, and instrumentation.

* Low Dropout Voltage: The device offers a low dropout voltage, typically around 50 mV at 1 mA load, allowing for more efficient use in low-voltage systems.

* Stable Over Temperature: The REF1925AIDDCR maintains excellent temperature stability, with a typical temperature coefficient of 5 ppm/°C. This ensures a stable reference voltage under varying environmental conditions.

* Low Power Consumption: It operates with a low supply current (typically 40 µA), which is advantageous for battery-operated systems where energy efficiency is crucial.

* Low Output Impedance: The device provides low output impedance (typically 0.5 Ω), helping to maintain stable performance under varying load conditions.

* Wide Operating Voltage Range: It operates with an input voltage range from 3V to 12V, which is compatible with a broad range of power supplies and input sources.

* Tiny Package Size: The REF1925AIDDCR is housed in a small SOT-23 package (SOT-23-5), making it ideal for space-constrained designs where minimizing board real estate is important.

## Key Specifications

* Output Voltage: The nominal output voltage is 2.495V, with a tolerance of ±0.05%, making it ideal for precision applications that require a stable, well-defined reference voltage.

* Output Voltage Tolerance: The reference voltage tolerance is typically ±0.05% (±125 mV), ensuring the voltage remains within a tight window of accuracy, critical for sensitive applications like measurement systems.

* Output Noise Density: The output noise density is typically 30 µVRMS, which is very low, reducing the chance of noise interference in high-precision analog-to-digital or digital-to-analog conversions.

* Dropout Voltage: At a load current of 1 mA, the typical dropout voltage is 50 mV, which is quite low and allows the reference to function effectively even with a limited input voltage margin.

* Temperature Coefficient: The temperature coefficient is typically 5 ppm/°C, ensuring that the reference voltage changes very little with temperature fluctuations, making it suitable for environments with varying temperature conditions.

* Supply Current: The typical quiescent current is 40 µA, allowing for low power consumption, which is critical for battery-powered or energy-sensitive systems.

* Operating Temperature Range: The device is designed to operate over an extended temperature range of -40°C to 125°C, ensuring it performs reliably in harsh environments.

* Input Voltage Range: The device supports an input voltage range from 3V to 12V, offering flexibility for use with various power supplies.

* Output Impedance: The typical output impedance is 0.5 Ω, which helps ensure stable performance even under dynamic load conditions.

## Advanced Features

* Excellent Load Regulation: The REF1925AIDDCR features excellent load regulation, ensuring minimal variation in the reference voltage with changes in the load current. This is particularly important in precision applications where even small fluctuations in voltage can lead to inaccuracies.

* Low Drift Over Time: The device exhibits very low drift over time, ensuring that the reference voltage remains stable throughout the lifespan of the system. This makes it an ideal choice for long-term applications that require consistent performance.

* Start-up Behavior: The REF1925AIDDCR exhibits quick start-up times, typically requiring less than 10 ms to stabilize after power-up, making it suitable for systems that need rapid initialization.

* Precision for High-Resolution Applications: With its ultra-low drift and tight tolerance, the REF1925AIDDCR is an excellent choice for high-resolution measurement systems, ensuring that measurements are highly accurate and consistent over time.

* Reduced Sensitivity to Power Supply Noise: The device features low susceptibility to power supply noise, ensuring that the reference voltage remains unaffected by fluctuations in the input power supply.

## Applications

The REF1925AIDDCR is designed for use in a wide variety of applications where precise voltage references are critical:

* Data Acquisition Systems: In systems where high-accuracy ADCs or DACs are used, the REF1925AIDDCR ensures that the reference voltage remains stable and accurate, providing precise measurement and conversion.

* Instrumentation: It is used in test equipment and measurement devices that require a stable and accurate reference voltage for high-precision results.

* Voltage Regulators: The REF1925AIDDCR can be used as a reference in voltage regulator designs, ensuring that the output voltage remains stable and within the desired tolerance.

* Battery-Powered Devices: With its low power consumption and wide input voltage range, it is ideal for battery-powered systems that require a low-dropout voltage reference.

* Precision Medical Equipment: It can be used in medical diagnostic instruments where precise voltage references are needed for reliable measurements.

* Telecommunication Equipment: The device can be used in telecommunication systems requiring precise voltage references for signal integrity and system accuracy.

## Package and Environmental Considerations

* Package Type: The REF1925AIDDCR is housed in a 5-pin SOT-23 package, which is compact and ideal for space-constrained designs. Its small form factor ensures minimal impact on the overall system size.

* RoHS Compliant: The REF1925AIDDCR is RoHS-compliant, making it suitable for use in environmentally conscious designs that meet international environmental regulations.

* Operating Temperature Range: The device operates over a wide temperature range from -40°C to 125°C, making it suitable for a variety of industrial, automotive, and harsh environmental conditions.

* Storage Temperature: The recommended storage temperature for the REF1925AIDDCR is from -65°C to 150°C, ensuring that it can be safely stored and transported without compromising performance.

## Conclusion

The Texas Instruments REF1925AIDDCR is a high-precision, low-noise voltage reference designed for use in a variety of applications that require stable, accurate, and reliable reference voltages. Its low dropout voltage, low power consumption, and high precision make it an excellent choice for battery-powered systems, precision measurement instruments, and data acquisition systems. With its excellent temperature stability, low output voltage noise, and compact package, the REF1925AIDDCR is well-suited for modern electronic designs that require high-performance voltage references.