National Semiconductor Corporation has introduced two configurable sensor analog front-end (AFE) ICs. Both products use National Semiconductor’s original technology and are supported by a variety of new design tools that allow system designers to use major manufacturers. All kinds of sensor products are manufactured to complete the signal path design and bring the products to the market quickly.
System designers can use the WEBENCH® Sensor AFE Designer to complete the sensor signal path design using these two configurable sensor analog front-end circuits. In other words, engineers can use this design tool to pick sensors, perform design, configure solutions, and download configuration parameters to the sensor's analog front-end circuit. At present, a typical sensor application requires several circuit boards and up to 25 components. With National Semiconductor's solution, only one chip is required. Similarly, the design of a sensor system in the past took weeks or even months, and with National Semiconductor's new products and design tools, the design time can be reduced to a few minutes.
National's two new sensor analog front-end chips are the first two products in the configurable sensor analog front-end circuit product line. Both chips have their own characteristics and are suitable for different sensor systems.
The National Semiconductor LMP90100 chip is a 24-bit, multi-channel, low-power sensor analog front-end circuit that can truly continuously calibrate the background signal and make diagnostics. It is suitable for high performance transceivers and inverter systems. National Semiconductor's patented background signal calibration technology can effectively eliminate drift over time and temperature changes, and determine offset and gain errors without disturbing the side-to-side signal. The LMP90100 has a flexible input (multiplexer) configuration in addition to a 24-bit Sigma-delta ADC, allowing it to support any ratio of differential or single-ended inputs. Each sensor's signal gain (including 1, 2, 4, 8, 16, 32, 64, and 128), sampling rate, and diagnostic parameters are programmable. The chip also provides two matched drive currents to drive the sensor. The average power consumption of the LMP90100 chip is lower than the average value of 0.7mA, and ensures normal operation in the temperature range of -40oC to +125°C. This feature makes this chip ideal for temperature transceivers or 4mA to 20mA systems.
The National Semiconductor LMP91000 chip is a fully configurable low-power potentiostat that provides a highly integrated complete signal path between the sensor and the ADC. This configurable analog front-end circuit is suitable for micro-power chemical and gas detection applications such as triple-pole single gas sensors and dual-ended oxygen sensors. The LMP91000 chip measures the current in the potentiostat and is proportional to the amount of gas being measured. With a transimpedance amplifier, the LMP91000 generates an output voltage that is proportional to this current, and derives the gas content. The LMP91000 allows the user to set the transimpedance gain value through the I2C-compatible interface, thus enabling the sensitive response to toxic gases in concentrations between 0.5nA/ppm and 9.5nA/ppm. In addition, the LM91000 consumes very little power and is therefore suitable for battery-powered systems and transceiver systems from 4mA to 20mA. The potentiostat voltage and output gain of this chip can be set according to the design requirements. This allows engineers to detect more gas types, or detect different gas concentrations, and ensure that the total system power consumption of the device can be as low as 10μA ( average value). Engineers can also verify sensor performance through the I2C interface, while the built-in temperature sensor provides additional output for temperature monitoring. The LMP91000's operating voltage range is between 2.7V and 5.5V.
The WEBENCH sensor analog front-end circuit design tool is the latest member of the National Semiconductor WEBENCH series of network design tools. System design engineers can now design and test offline design tools through the hardware interface, reducing design time and accelerating modeling evaluation. Engineers can also use the off-line test system to download the design configuration parameters to the sensor's analog front-end circuit. After the sensor is placed in the system, simulation tests can be performed.
System designers can use the WEBENCH® Sensor AFE Designer to complete the sensor signal path design using these two configurable sensor analog front-end circuits. In other words, engineers can use this design tool to pick sensors, perform design, configure solutions, and download configuration parameters to the sensor's analog front-end circuit. At present, a typical sensor application requires several circuit boards and up to 25 components. With National Semiconductor's solution, only one chip is required. Similarly, the design of a sensor system in the past took weeks or even months, and with National Semiconductor's new products and design tools, the design time can be reduced to a few minutes.
National's two new sensor analog front-end chips are the first two products in the configurable sensor analog front-end circuit product line. Both chips have their own characteristics and are suitable for different sensor systems.
The National Semiconductor LMP90100 chip is a 24-bit, multi-channel, low-power sensor analog front-end circuit that can truly continuously calibrate the background signal and make diagnostics. It is suitable for high performance transceivers and inverter systems. National Semiconductor's patented background signal calibration technology can effectively eliminate drift over time and temperature changes, and determine offset and gain errors without disturbing the side-to-side signal. The LMP90100 has a flexible input (multiplexer) configuration in addition to a 24-bit Sigma-delta ADC, allowing it to support any ratio of differential or single-ended inputs. Each sensor's signal gain (including 1, 2, 4, 8, 16, 32, 64, and 128), sampling rate, and diagnostic parameters are programmable. The chip also provides two matched drive currents to drive the sensor. The average power consumption of the LMP90100 chip is lower than the average value of 0.7mA, and ensures normal operation in the temperature range of -40oC to +125°C. This feature makes this chip ideal for temperature transceivers or 4mA to 20mA systems.
The National Semiconductor LMP91000 chip is a fully configurable low-power potentiostat that provides a highly integrated complete signal path between the sensor and the ADC. This configurable analog front-end circuit is suitable for micro-power chemical and gas detection applications such as triple-pole single gas sensors and dual-ended oxygen sensors. The LMP91000 chip measures the current in the potentiostat and is proportional to the amount of gas being measured. With a transimpedance amplifier, the LMP91000 generates an output voltage that is proportional to this current, and derives the gas content. The LMP91000 allows the user to set the transimpedance gain value through the I2C-compatible interface, thus enabling the sensitive response to toxic gases in concentrations between 0.5nA/ppm and 9.5nA/ppm. In addition, the LM91000 consumes very little power and is therefore suitable for battery-powered systems and transceiver systems from 4mA to 20mA. The potentiostat voltage and output gain of this chip can be set according to the design requirements. This allows engineers to detect more gas types, or detect different gas concentrations, and ensure that the total system power consumption of the device can be as low as 10μA ( average value). Engineers can also verify sensor performance through the I2C interface, while the built-in temperature sensor provides additional output for temperature monitoring. The LMP91000's operating voltage range is between 2.7V and 5.5V.
The WEBENCH sensor analog front-end circuit design tool is the latest member of the National Semiconductor WEBENCH series of network design tools. System design engineers can now design and test offline design tools through the hardware interface, reducing design time and accelerating modeling evaluation. Engineers can also use the off-line test system to download the design configuration parameters to the sensor's analog front-end circuit. After the sensor is placed in the system, simulation tests can be performed.
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