Current sense amplifiers with ADC and op amp/comparator

Maxim Integrated Products has introduced the MAX9611/MAX9612, current-sense amplifiers integrating I²C-controlled, 12-bit, 500sps ADC for reading the sense-resistor current, input common-mode voltage, op-amp/comparator output, op-amp/comparator reference voltage, and internal die temperature. The I²C bus is compatible with 1.8V and 3.3V logic, providing a direct interface for modern microcontrollers. This integration provides the key components for easy implementation of fault monitoring and closed-loop control applications, such as inrush-current limiting and gain control.

These CSAs have a wide input common-mode voltage range (0V to +60V). Programmable (440mV, 110mV, and 55mV) full-scale sense voltages enable a wide dynamic range, accurate current measurement, and flexibility in selecting sense resistor values. The MAX9611/MAX9612 are fully specified over the -40°C to +125°C automotive temperature range, and are available in a 10-pin µMAX package. Prices start at $1.50 (1000-up, FOB USA).