XR18910IL

XR18910IL Datasheet

XR18910

Part	Datasheet
XR18910IL	XR18910IL (pdf)

PDF Datasheet Preview
XR18910 8:1 Sensor Interface Analog Front End The XR18910 is a unique sensor interface integrated circuit with an onboard 8:1 multiplexer, offset correction Digital-to-Analog Converter DAC , instrumentation amplifier and voltage reference. The XR18910 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 XR18910’s many functions such as input and gain selection. A 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 XR18910 offers 8 fixed gain settings from 2V/V to 760V/V , each with an error of only 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 XR18910 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 3.5mm x 3.5mm QFN package. It consumes less than 559uA supply current and offers a sleep mode for added power savings. The XR18910 is well suited for industrial and consumer applications using bridge sensors. FEATURES • Integrated features for interfacing multiple bridge sensors with an MCU or FPGA 8:1 differential MUX with I2C interface Instrumentation amplifier LDO Offset correction DAC with I2C interface ±560mV offset correction range • Eight selectable voltage gains from 2V/V to 760V/V with only gain error • 3mV maximum input offset voltage • 100pA maximum input bias current • 559uA 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 • 3.5mm x 3.5mm QFN-24 package APPLICATIONS • Bridge sensor interface • Pressure and temperature sensors • Strain gauge amplifier • Industrial process controls • Weigh scales 6.8uF 6.8uF BRIDGE 8 BRIDGE 1 0.1uF BRDG VCC 0.1uF LDO IN8+ 0.1uF IN8- INA / OUT 10k 8:1 MUX IN1+ IN1- ±560mV OFFSET TRIM 10-BIT DAC I2C CONTROL VDD 4.7k 10nF VDD 4.7k XR18910 AGND DGND Figure Typical Application RTI Noise µV Time seconds Figure 0.1Hz to 10Hz RTI Voltage Noise 1/19 XR18910 Ordering Information Operating Temperature Range XR18910IL-67 XR18910ILMTR-67 XR18910ILTR-67 XR18910IL-66 XR18910ILMTR-66 XR18910ILTR-66 XR18910IL-65 -40°C to 85°C XR18910ILMTR-65 XR18910ILTR-65 XR18910IL-64 XR18910ILMTR-64 XR18910ILTR-64 XR18910ILEVB Evaluation board Environmental Rating RoHS-compliant halogen free Package 3.5mm x 3.5mm QFN-24 XR18910 Packaging Quantity Tray 250/tape and reel 3k/tape and reel Tray 250/tape and reel 3k/tape and reel Tray 250/tape and reel 3k/tape and reel Tray 250/tape and reel 3k/tape and reel 48760 Kato Road Fremont, CA 94538 USA Tel. +1 510 668-7000 Fax +1 510 668-7001 Email: Exar Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. Exar Corporation conveys no license under any patent or other right and makes no representation that the circuits are free of patent infringement. While the information in this publication has been carefully checked, no responsibility, however, is assumed for inaccuracies. Exar Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless Exar Corporation receives, in writing, assurances to its satisfaction that a the risk of injury or damage has been minimized b the user assumes all such risks c potential liability of Exar Corporation is adequately protected under the circumstances. Reproduction, in part or whole, without the prior written consent of Exar Corporation is prohibited. Exar, XR and the XR logo are registered trademarks of Exar Corporation. All other trademarks are the property of their respective owners. 2016 Exar Corporation XR18910_DS 19/19

PDF Datasheet Preview

XR18910
8:1 Sensor Interface Analog Front End

The XR18910 is a unique sensor interface integrated circuit with an onboard 8:1 multiplexer, offset correction Digital-to-Analog Converter DAC , instrumentation amplifier and voltage reference. The XR18910 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 XR18910’s many functions such as input and gain selection.

A 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 XR18910 offers 8 fixed gain settings from 2V/V to 760V/V , each with an error of only 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 XR18910 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 3.5mm x 3.5mm QFN package. It consumes less than 559uA supply current and offers a sleep mode for added power savings.

The XR18910 is well suited for industrial and consumer applications using bridge sensors.

FEATURES
• Integrated features for interfacing multiple
bridge sensors with an MCU or FPGA 8:1 differential MUX with I2C interface Instrumentation amplifier LDO Offset correction DAC with I2C interface ±560mV offset correction range
• Eight selectable voltage gains from 2V/V to 760V/V with only gain error
• 3mV maximum input offset voltage
• 100pA maximum input bias current
• 559uA 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
• 3.5mm x 3.5mm QFN-24 package

APPLICATIONS
• Bridge sensor interface
• Pressure and temperature sensors
• Strain gauge amplifier
• Industrial process controls
• Weigh scales
6.8uF
6.8uF

BRIDGE 8 BRIDGE 1
0.1uF

BRDG VCC
0.1uF

LDO IN8+
0.1uF

IN8-

INA /

OUT 10k
8:1 MUX

IN1+ IN1-
±560mV OFFSET TRIM
10-BIT DAC

I2C CONTROL

VDD 4.7k
10nF

VDD 4.7k

XR18910

AGND

DGND

Figure Typical Application

RTI Noise µV

Time seconds

Figure 0.1Hz to 10Hz RTI Voltage Noise
1/19

XR18910
Ordering Information

Operating Temperature Range

XR18910IL-67

XR18910ILMTR-67

XR18910ILTR-67

XR18910IL-66

XR18910ILMTR-66

XR18910ILTR-66 XR18910IL-65
-40°C to 85°C

XR18910ILMTR-65

XR18910ILTR-65

XR18910IL-64

XR18910ILMTR-64

XR18910ILTR-64

XR18910ILEVB

Evaluation board

Environmental Rating

RoHS-compliant halogen free

Package 3.5mm x 3.5mm QFN-24

XR18910

Packaging Quantity Tray
250/tape and reel 3k/tape and reel

Tray 250/tape and reel 3k/tape and reel

Tray 250/tape and reel 3k/tape and reel

Tray 250/tape and reel 3k/tape and reel
48760 Kato Road Fremont, CA 94538 USA

Tel. +1 510 668-7000 Fax +1 510 668-7001 Email:

Exar Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. Exar Corporation conveys no license under any patent or other right and makes no representation that the circuits are free of patent infringement. While the information in this publication has been carefully checked, no responsibility, however, is assumed for inaccuracies.

Exar Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless Exar Corporation receives, in writing, assurances to its satisfaction that a the risk of injury or damage has been minimized b the user assumes all such risks c potential liability of Exar Corporation is adequately protected under the circumstances.

Reproduction, in part or whole, without the prior written consent of Exar Corporation is prohibited. Exar, XR and the XR logo are registered trademarks of Exar Corporation. All other trademarks are the property of their respective owners.
2016 Exar Corporation

XR18910_DS
19/19

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Datasheet ID: XR18910IL 512923