The National Semiconductor LM4140ACM-2.0 is a precision voltage reference designed for a variety of applications requiring a stable and accurate reference voltage. This device is particularly useful in analog-to-digital converters (ADCs), digital-to-analog converters (DACs), and other precision measurement systems. Below is a detailed overview of the LM4140ACM-2.0, including its specifications and features.

## Overview

The LM4140ACM-2.0 is a low dropout (LDO) voltage reference that provides a fixed output voltage of 2.0 volts. It is designed to deliver high accuracy and low temperature drift, making it suitable for precision applications. The device is available in a compact surface-mount package, which facilitates easy integration into various circuit designs.

## Key Features

1. Output Voltage: The LM4140ACM-2.0 provides a fixed output voltage of 2.0V.
2. High Accuracy: The device offers a typical output voltage tolerance of ±0.5% at 25°C, ensuring reliable performance in precision applications.
3. Low Temperature Coefficient: The temperature coefficient is typically 30 ppm/°C, which minimizes variations in output voltage with temperature changes.
4. Low Dropout Voltage: The dropout voltage is typically 0.1V at a load current of 10 mA, allowing for efficient operation in low-voltage applications.
5. Wide Operating Current Range: The LM4140ACM-2.0 can operate with a load current range from 0 mA to 10 mA, providing flexibility in various circuit designs.
6. Low Noise: The device features low output noise, which is critical for applications requiring high precision and minimal interference.
7. Short-Circuit Protection: The LM4140ACM-2.0 includes built-in short-circuit protection, enhancing the reliability of the device in various operating conditions.
8. Temperature Range: The device operates over a temperature range of -40°C to +85°C, making it suitable for industrial and automotive applications.

## Electrical Specifications

Here are the key electrical specifications for the LM4140ACM-2.0:

- Output Voltage: 2.0V ±0.5% (at 25°C)
- Temperature Coefficient: 30 ppm/°C (typical)
- Dropout Voltage: 0.1V (at 10 mA load)
- Output Current: 0 mA to 10 mA
- Supply Voltage: 5V to 15V
- Input Voltage Range: 2.5V to 15V
- Output Noise Voltage: 100 µV (typical)
- Line Regulation: 0.01%/V (typical)
- Load Regulation: 0.1% (typical)

## Package Information

The LM4140ACM-2.0 is available in a surface-mount package, specifically the MSOP-8 (Mini Small Outline Package), which is designed for compact applications. The small footprint of the package allows for efficient use of PCB space.

## Applications

The LM4140ACM-2.0 is suitable for a wide range of applications, including:

- Precision voltage references in ADCs and DACs
- Calibration equipment
- Battery-powered devices
- Industrial control systems
- Medical instrumentation
- Automotive electronics

## Conclusion

The National Semiconductor LM4140ACM-2.0 is a highly accurate and reliable voltage reference that meets the demands of modern electronic applications. With its low dropout voltage, low noise, and wide operating temperature range, it is an excellent choice for designers seeking precision and stability in their circuits. Whether used in consumer electronics, industrial systems, or automotive applications, the LM4140ACM-2.0 provides the performance and reliability needed for critical voltage reference tasks.