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LM1815 Datasheet(PDF) 1 Page - ARTSCHIP ELECTRONICS CO.,LMITED. |
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LM1815 Datasheet(HTML) 1 Page - ARTSCHIP ELECTRONICS CO.,LMITED. |
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1 / 7 page  LM1815 www.artschip.com 1 LM1815 Adaptive Variable Reluctance Sensor Amplifier General Description The LM1815 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 LM1815. 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 incorning 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 signal amplitude. Minimum input signal is 100 mVp-p. Features Adaptive hysteresis Single supply operation 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 Connection Diagram Top View Order Number LM1815M or LM1815N See NS Package Number M14A or N14A Truth Table Signal Input Input Select Timing Input Gated Output Pulses L X Pulses X H Pulses Pulses |
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