IL1815

TECHNICAL DATA IL1815 Adaptive Variable Reluctance Sensor Amplifier Features Adaptive hysteresis Single supploperation Ground referenced input True zero crossing timing reference Operates from 2V to 12V supply voltage Handles inputs from 100 mV to over 120V with external resistor CMOS compatible logic Applications Position sensing with notched wheels Zero crossing switch Motor speed control Tachometer Engine testing IL1815 N SUFFIX PLASTIC DIP 14 1 14 1 D SUFFIX PLASTIC SO ORDERING INFORMATION IL1815N Plastic DIP IL1815D SOIC TA = -55° to 125° C for all packages General Description The IL1815 is an adaptive sense amplifier and default gating circuit for motor control applications. The sense amplifier provides a one-shot pulse output whose leading edge coincides with the negative-going zero crossing of a ground referenced input signal such as from a variable reluctance magnetic pick-up coil. In normal operation, this timing reference signal is processed (delayed) externally and returned to the IL1815. A logic input is then able to select either the timing reference or the processed signal for transmission to the output driver stage. The adaptive sense amplifier operates with a positive-going threshold which is derived by peak detecting the incoming signal and dividing this down. Thus the input hysteresis varies with input signal amplitude. This enables the circuit to sense in situations where the high speed noise is greater than the low speed s...