The LM1815 is an adaptive sense amplifier and default gating circuit 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 adaptive sense amplifier operates with a positive-going threshold derived by peak detecting the incoming signal and dividing it down. The minimum input signal is 150mVP-P.
The LM1815 is an adaptive sense amplifier that provides a one‑shot pulse output synchronized with the negative‑going zero crossing of a ground‑referenced input signal, such as a variable‑reluctance pickup coil. It operates from a single supply (2 V‑12 V) and adapts its hysteresis to the input amplitude, allowing reliable detection even when high‑speed noise exceeds the signal level.
The document includes electrical characteristics, typical performance curves, application hints, wiring diagrams, and physical dimensions, as well as safety notices and life‑support policy information for designers integrating the device into motor‑control or engine‑testing systems.
| Operating Supply Voltage | 2.5 V – 12 V |
|---|---|
| Power Dissipation | 1250 mW |
| Operating Temperature Range | -40 °C to +125 °C |
| Package Lead Pitch | 0.228 in – 0.244 in (5.791 mm – 6.198 mm) |
The minimum input signal is 150 mV p‑p.
It operates from 2.5 V up to 12 V.
The device can dissipate up to 1250 mW.