LMP91000SD/NOPB

Analog Front End (AFE) Overview

The LMP91000SD/NOPB is a configurable analog front-end (AFE) potentiostat designed for low-power chemical sensing applications. It provides a complete signal path solution between electrochemical sensors and microcontrollers, generating an output voltage proportional to cell current. The device operates on an analog supply voltage ranging from 2.7 V to 5.25 V and functions within a temperature range of -40°C to +85°C. Packaged in a WSON-14 format, it integrates programmable gain amplifiers and bias controls to support various sensor types, including three-wire toxic gas sensors and two-wire fuel cell sensors.

Analog Front End (AFE) Feature Summary

• Configurable AFE Potentiostat architecture supporting multiple electrochemical sensor interfaces
• Integrated transimpedance amplifier with seven programmable internal gain resistors
• Variable bias generation capable of producing positive or negative voltages between reference and working electrodes
• I2C digital interface for register configuration and status monitoring

Analog Front End (AFE) Applications

• Low-power toxic gas detection systems
• Three-wire electrochemical gas sensors
• Two-wire fuel cell type sensors
• Portable environmental monitoring devices

Analog Front End (AFE) Procurement Notes

Verify the package designation SD corresponds to the WSON-14 footprint when reviewing schematic footprints. Confirm the NOPB suffix indicates lead-free and RoHS compliance relative to specific manufacturing dates. Ensure I2C address settings match the system bus requirements, as the default address may require verification against the specific revision of the datasheet.

Analog Front End (AFE) Selection Notes

Select this component when designing circuits requiring precise control over electrode bias voltages for electrochemical cells. The integrated TIA simplifies design by eliminating external high-value feedback resistors for low-current measurements. Verify that the required sensitivity range falls within the supported 0.5 nA/ppm to 9500 nA/ppm span. Check power supply constraints to ensure operation within the 2.7 V to 5.25 V window.

Analog Front End (AFE) Part Context

This part belongs to the LMP91000 family of sensor AFEs from Texas Instruments. It serves as a specialized interface for potentiostatic control, distinct from general-purpose operational amplifiers. The SD variant specifically denotes the small outline waffle-pack or tape-and-reel compatible WSON package, differentiating it from larger QFN or DIP options in the same functional family.

Analog Front End (AFE) Replacement Considerations

The LMP91000SDX/NOPB is the reel-manufactured version of the same device. For multi-channel requirements, consider the LMP90100 series. Single-channel alternatives with similar potentiostat functionality include the LMP91002.