LMP91000SDE/NOPB

Analog Front End (AFE) Overview

The LMP91000SDE/NOPB is a configurable analog front-end (AFE) potentiostat designed for low-power chemical sensing applications. It integrates a complete signal path to generate an output voltage proportional to battery current, supporting electrochemical sensors such as toxic gas and amperometric glucose sensors. The device operates on a single supply voltage ranging from 2.7 V to 5.25 V with an average power consumption of less than 10 µA. Key internal components include a programmable bias voltage generator, a transimpedance amplifier (TIA) with gains between 2.75 kΩ and 350 kΩ, and an I²C interface for configuration and diagnostics. It is housed in a 14-pin WSON package.

Analog Front End (AFE) Feature Summary

• Integrated potentiostat circuitry suitable for most electrochemical cells
• Programmable TIA gain range from 2.75 kΩ to 350 kΩ via I²C
• Low average power consumption of less than 10 µA
• Supports sensor sensitivity ranges from 0.5 nA/ppm to 9500 A/ppm

Analog Front End (AFE) Applications

• Amperometric gas sensors for toxic gas detection
• Electrochemical glucose meters
• Chemical composition identification systems

Analog Front End (AFE) Procurement Notes

Verify the specific suffix 'E' against the manufacturer's official documentation to confirm if it denotes a specific tape-and-reel quantity or packaging variant distinct from the standard SD version. Ensure the component meets RoHS compliance standards as indicated for the NOPB series. Cross-reference the datasheet revision date to ensure compatibility with current design requirements.

Analog Front End (AFE) Selection Notes

Select this component when designing systems requiring a dedicated potentiostat for amperometric sensors without discrete op-amp complexity. The integrated I²C interface simplifies microcontroller communication. Consider the operating temperature range of -40°C to +85°C for environmental suitability. Verify that the required TIA gain and bias voltage settings fall within the device's programmable limits.

Analog Front End (AFE) Part Context

The LMP91000 family serves as a specialized sensor AFE system by Texas Instruments. The LMP91000SDE/NOPB is part of this line, offering a configurable solution for chemical sensing. It replaces multiple discrete components typically needed for potentiostat circuits, reducing board space and design effort for gas and biosensor applications.

Analog Front End (AFE) Replacement Considerations

The LMP91000SD/NOPB is a closely related variant within the same family. Verify pinout and electrical specifications before substitution. Other TI sensor AFEs like the LMP90100 offer multi-channel capabilities but differ significantly in architecture and application scope.