Description

The XR14911 is a unique sensor interface integrated circuit with an onboard 4:1 multiplexer, offset correction Digital-to-Analog Converter (DAC), instrumentation amplifier and voltage reference. The XR14911 is designed to integrate multiple bridge sensors with a Microcontroller (MCU) or Field-Programmable Gate Array (FPGA).

The integrated offset correction DAC provides digital calibration of the variable and in many cases substantial offset voltage generated by the bridge sensors. The DAC is controlled by an I2C  compatible 2-wire serial interface. The serial interface also provides the user with easy controls to the XR14911’s many functions such as input and gain selection.

An integrated linear regulator (LDO) provides a regulated voltage to power the input bridge sensors and is selectable, between 3V and 2.65V. The LDO current can be sensed and a proportional voltage present at the output of the IC for monitoring the LDO current.

The XR14911 offers 8 fixed gain settings (from 2V/V to 760V/V), each with an error of only ±0.5%, that are selectable via the I2C interface. It also offers less than 3mV maximum input offset voltage, 100pA maximum input bias current, and 100pA maximum input offset current.

The XR14911 is designed to operate from 2.7V to 5V supplies, specified over the industrial temperature range of -40°C to 85°C and is offered in a space saving 1.67mm x 1.67mm chip scale package. It consumes less than 559μA supply current and offers a sleep mode for added power savings.

The low power, low input bias current and integrated features make the XR14911 well suited for both industrial and consumer applications using bridge sensors.