National Semiconductors has launched two configurable sensor analog front end integrated circuits that can rapidly track signal path patterns in various products.
The configurable ICs and WEBENCH Sensor AFE Designer will help designers choose a sensor, manufacture and configure the solution before downloading data to the sensor AFE. Configuration is both time and space efficient, thus reducing costs. They have been customized for particular applications and their features include programmable current sources, voltage reference options and adjustable sample rates. Both devices are power efficient.
The LMP91000 is a potentiostat offering an integrated signal path between a sensor and analog-to-digital converter (ADC). It eliminates offset and gain error obtained without disturbing signals measured across time and temperature. It offers technical specifications for a range of temperature, pressure and chemical sensors.
The LMP90100 is a multi-channel 24-bit sensor AFE featuring non-stop background calibration and diagnostics for high performance transmitter and transducer applications. It features a flexible input (mux) configuration to interface with any set of differential or single-ended inputs. Signal gains (1, 2, 4, 8, 16, 32, 64 and 128), sample rate and diagnostics can be programmed to suit each sensor. Two matched current drives drive the sensors. It draws less than 0.7mA on an average and operates across temperatures ranging from -40 to 125°C, thus helping to make it suitable for temperature transmitters or 4mA to 20mA applications.
The LMP90100 is available in a 28-pin TSSOP package and also available in a 14-pin LLP package.