The SD400 from SensorDynamics, Graz-Lebring, Austria, is a single-chip sensor interface family that offers a set of analog blocks for interfacing with a range of sensors. A tool kit lets you configure the sensor interface and develop firmware. Two versions of the family are available. The first version has a specialized eddy current interface and is designed for contactless displacement measurement. The second version provides 2 differential analog input channels and works with Wheatstone bridge-type sensors as thermocouples, AMR, GMR, piezoresistive, pressure, water flow, and strain-gauge sensors. Features include a –40°C to 150°C operating temperature range, 3.9–33 V supply voltage range with peaks up to 50 V, 8051 CPU core running at 20 MHz, and 2 full 14-bit Σ-Δ ADCs.