DESCRIPTION

· The LM1815 is an adaptive sense amplifier and default gating circuit designed for motor control applications.

· It 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.

· The timing reference signal is processed externally and returned to the LM1815, where a logic input selects either the timing reference or the processed signal for transmission to the output driver stage.

FEATURES

· Adaptive hysteresis for improved noise immunity.

· Single supply operation from 2V to 12V.

· Ground-referenced input for true zero-crossing timing reference.

· Handles input signals from 100mV P-P to over 120V P-P with an external resistor.

· CMOS compatible logic for easy integration.

APPLICATIONS

· Position sensing with notched wheels.

· Zero-crossing switch applications.

· Motor speed control.

· Tachometer for speed measurement.

· Engine testing and diagnostics.