Products

XR14910

4:1 Sensor Interface AFE

Board-tiny (1)

Description

The XR14910 is a unique sensor interface integrated circuit with an on-board 4:1 multiplexer, offset correction DAC, instrumentation amplifier and voltage reference. The XR14910 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 XR14910’s many functions such as input and gain selection.

An integrated LDO provides a regulated voltage to power the input bridge sensors and is selectable, between 3V and 2.65V, via the serial interface for lower voltage compatibility. The LDO current can be sensed and a proportional voltage present at the output of the IC for monitoring the LDO current.

The XR14910 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 1mV maximum input offset voltage, 100pA maximum input bias current, and 100pA maximum input offset current.

The XR14910 is designed to operate from 2.7V to 5V supplies and is specified over the industrial temperature range of -40°C to +85°C. It is offered in a space saving 1.67mm x 1.67mm chip scale package. It consumes less than 556μA maximum supply current and offers a sleep mode for added power savings.

The low power, low input bias current and integrated features make the XR14910 well suited for both industrial and consumer applications using bridge sensors.

Additional information

Features

• Integrated features for interfacing multiple bridge sensors with an MCU or FPGA:
» 4:1 differential mux with I2C interface
» Instrumentation amplifier
» LDO
» Offset correction DAC with I2C interface (±560mV offset correction range – RTI)
• Eight selectable voltage gains from 2V/V to 760V/V with only ±0.5% gain error
• 3mV maximum input offset voltage
• 100pA maximum input bias current
• 556μA maximum supply current
• 2.7V to 5V analog supply voltage range
• 1.8V to 5V digital supply voltage range
• -40˚C to +85˚C temperature range
• 1.67mm x 1.67mm CSP-16 package

Applications

• Bridge sensor interface
• Pressure & temperature sensors
• Strain gauge amplifier
• Industrial process controls
• Weigh scales

Details

Part Number Package Temp Range Packaging Method Lead Free
XR14910IZTR-F CSP-16 -40°C to +85°C T&R Yes