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- LM1815
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- Last added
- 2012-05-09
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National Semiconductor LM1815 Adaptive Variable Reluctance Sensor Amplifier Manual
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.
National Semiconductor LM1815 specifications
| 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) |
Source: National Semiconductor LM1815 Adaptive Variable Reluctance Sensor Amplifier Manual
All National Semiconductor LM1815 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Questions answered in these manuals
What is the minimum input signal voltage required for the LM1815?
The minimum input signal is 150 mV p‑p.
From: National Semiconductor LM1815 Adaptive Variable Reluctance Sensor Amplifier Manual
What supply voltage range does the LM1815 support?
It operates from 2.5 V up to 12 V.
From: National Semiconductor LM1815 Adaptive Variable Reluctance Sensor Amplifier Manual
What applications is the LM1815 suited for?
It is used for position sensing with notched wheels, zero‑cross switches, motor speed control, tachometer functions, and engine testing.
From: National Semiconductor LM1815 Adaptive Variable Reluctance Sensor Amplifier Handbook