XR18910

8:1 Sensor Interface AFE
Data Sheet

Description

The XR18910 is a unique sensor interface integrated circuit with an on-board 8:1 multiplexer, offset correction 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 two-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.

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 XR18910 offers eight fixed gain settings (from 2V/V to 760V/V), each with an error of only ±0.5%, that are selectable via the I2C interface. 

The XR18910 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 3.5mm x 3.5mm QFN-24 package. It consumes less than 559μA maximum supply current and offers a sleep mode for added power savings.

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 - 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
  • 559μA 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
  • 3.5 x 3.5mm QFN-24

Documentation

Application

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

Design Tools

Packaging

Pkg Code Details Quantities Dimensions PDF
TQFN24 3.5x3.5
  • JEDEC Reference:
  • MSL Pb-Free: L1 @ 260ºC
  • MSL SnPb Eutectic:
  • ThetaJA:
  • Bulk Pack Style: Tray
  • Quantity per Bulk Pack: 490
  • Quantity per Reel: 3000
  • Quantity per Tube: n/a
  • Quantity per Tray: 490
  • Reel Size (Dia. x Width x Pitch): 330 x 12 x 8
  • Tape & Reel Unit Orientation: Quadrant 1
  • Dimensions: mm
  • Length: 3.5
  • Width: 3.5
  • Thickness: 0.8
  • Lead Pitch: 0.4

Parts & Purchasing

Part Number Pkg Code RoHS Min Temp Max Temp Status Buy Now Order Samples
XR18910IL-64 TQFN24 3.5x3.5 -40 85 OBS Suggested:
XR18910ILTR-67
XR18910IL-65 TQFN24 3.5x3.5 -40 85 OBS Suggested:
XR18910ILTR-67
XR18910IL-66 TQFN24 3.5x3.5 -40 85 OBS Suggested:
XR18910ILTR-67
XR18910IL-67 TQFN24 3.5x3.5 -40 85 OBS Suggested:
XR18910ILTR-67
XR18910ILMTR-64 TQFN24 3.5x3.5 -40 85 OBS Suggested:
XR18910ILTR-64
XR18910ILMTR-65 TQFN24 3.5x3.5 -40 85 OBS Suggested:
XR18910ILTR-64
XR18910ILMTR-66 TQFN24 3.5x3.5 -40 85 OBS Suggested:
XR18910ILTR-64
XR18910ILMTR-67 TQFN24 3.5x3.5 -40 85 OBS Suggested:
XR18910ILTR-64
XR18910ILTR-64 TQFN24 3.5x3.5 -40 85 Active Order
XR18910ILTR-65 TQFN24 3.5x3.5 -40 85 OBS Suggested:
XR18910ILTR-67
XR18910ILTR-66 TQFN24 3.5x3.5 -40 85 OBS Suggested:
XR18910ILTR-67
XR18910ILTR-67 TQFN24 3.5x3.5 -40 85 Active Order
XR18910ILEVB Board Active
Show obsolete parts
Part Status Legend
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.

Quality Documents

Additional Quality Documentation may be available, please contact customersupport@maxlinear.com.
Distribution Date Description File
08/08/2018 Reactivation of previously discontinued product XR18910ILTR-64.
07/04/2018 Product Discontinuation Notice
07/21/2017 Product Discontinuation Notice
07/11/2017 Product Discontinuation Notification

Frequently Asked Questions

Find the product page of the part that you want to get an evaluation board for and click on Parts & Purchasing. Example:

 

Find the icons under Buy Now or Order Samples:

 
 

Click on the Buy Now icon and see who has stock and click on the Buy button:

 
 
 

Alternatively, you can click on the Order Samples

 
 

If the icons are missing, then contact Customer Support.

The best way to determine this is to go to maxlinear.com and type the part into the search function. At or near the top of the results you should see something that looks like:
 
 
 

In this example, we looked for XRA1201. Click on part number header or on the link at the bottom of the result.  This brings you to the product page. For example:

 
 
 

Click on Parts & Purchasing, highlighted with the blue arrow above. The screen changes to:

 
 
 

Notice the status column and the “Show obsolete parts” link.  A legend tells you the definition of the different statuses. Click on the “Show obsolete parts” link to see EOL or OBS part numbers along with the Active part numbers, the legend still present:

 
 
 

Another method to find out if a part is OBS or EOL is to click on SUPPORT at the top:

 
 
 

And then Product Change Notifications:

 
  
 

Type the part into the search, and click on one of the part numbers from the drop down menu. Then you can look for the Product Discontinuation Notice, which generally is at the top of the list, for example:

 
 
 

If you see this, it tells you that this particular orderable part has been discontinued and when the last order date is, or was. If you click on the file, then you can view the notice we sent about this if you purchased the part in the recent past. It may also advise of a replacement part. When an orderable part first becomes discontinued, Product Discontinuation Notices are sent are sent to those who have purchased the parts in the recent past, if purchased directly, with a dated opportunity to place a last order.