Configurable Sensor AFEs from National Semiconductor
National Semiconductor Corp.
January 30, 2011
The LMP90100 and LMP91000 configurable sensor analog front end (AFE) ICs from National Semiconductor Corp., Santa Clara, CA, together with the company's WEBENCH Sensor AFE Designer software, let you select a sensor, design and configure the system, and download configuration data to the sensor AFE. The LMP90100 multichannel, low-power, 24-bit sensor AFE has true continuous background calibration and diagnostics. Its 24-bit sigma-delta ADC has a flexible input configuration to interface with any combination of differential or single-ended inputs. The LMP91000 is a configurable low-power potentiostat that is suited for use in micropower chemical and gas sensing applications. The AFE measures current in a potentiostat that is proportional to the gas concentration, generating an output voltage proportional to the cell current using a transimpedance amplifier.
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