Hall-Effect Sensors Let Users Adjust the Bandwidth
Allegro MicroSystems announced Hall-effect sensors that are fully programmable with low noise and a high bandwidth. The A1360/1/2 devices are suited for use in high frequency, current sensing applications due to the low noise (down to 8 mV (p-p)), flat temperature coefficient (0 percent/°C) and high bandwidth capability (typically 50 kHz). They come in a 1 mm thin, four-lead SIP (KT-package), which allows for extremely small gaps in various concentrator and C-core systems to improve the signal-to-noise ratio and sensitivity. Accuracy is helped through the programmability on the output pin of the device. A capacitor to ground on the filter pin of the A136x can be used to tune the device bandwidth in a range from 50 kHz to less than 100 Hz. These ratiometric Hall-effect sensors provide a voltage output that is proportional to the applied magnetic field. The quiescent output voltage is user adjustable to 50 percent (bidirectional) or 10 percent (unidirectional) of the supply voltage (VCC). Each device has a programmable, sensitivity range: 0.7 mV/G to 1.4 mV/G (A1360), 1.5 mV/Gto 4.5 mV/G (A1361) and 4.5mV/G to 16 mV/G (A1362). The sensors are priced at $1.28 in quantities of 1,000.