LM74680

The LM74680 is a high-performance, low-power analog front-end (AFE) designed for precision measurement applications in industrial and automotive systems. It integrates a 16-bit sigma-delta ADC with programmable gain amplifiers (PGAs), enabling accurate signal conditioning for a wide range of sensor inputs, including thermocouples, RTDs, strain gauges, and pressure sensors. This device features a flexible input multiplexer that supports up to four differential or eight single-ended channels, allowing simultaneous monitoring of multiple sensors without external switching components. Its internal PGA offers programmable gains from 1 to 128, which enhances dynamic range and reduces the need for external signal conditioning circuitry. The integrated reference buffer ensures stable voltage references, minimizing drift over temperature and time. The LM74680 operates from a single 3.3V supply and consumes less than 500 µA in active mode, making it ideal for battery-powered and energy-constrained systems. It includes on-chip calibration registers and self-test functions that simplify system integration and improve long-term accuracy. Additionally, the device supports SPI-compatible serial communication at speeds up to 10 Mbps, enabling fast data transfer and easy interfacing with microcontrollers or digital signal processors. Designed for harsh environments, the LM74680 exhibits robust EMI immunity and operates reliably across a wide temperature range from -40°C to +125°C. Its package options include a space-saving 24-pin VQFN, facilitating compact PCB designs in space-limited applications such as smart meters, industrial automation, and automotive diagnostics. Applications for the LM74680 span precision sensing in process control, power management, and condition monitoring systems where high resolution, low noise, and minimal power consumption are critical. By combining high accuracy, flexibility, and ease of use, this AFE significantly reduces design complexity while improving system performance and reliability in demanding environments.