Texas Instruments LM1815
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 negativegoing 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 positivegoing threshold which is derived by peak detecting the incoming signal and dividing this down.| Part No. | LM1815 |
|---|---|
| Datasheet | LM1815 Download |
| Manufacturer |  Texas Instruments |
| Description | Adaptive Variable Reluctance Sensor Amplifier |
| Buy | Stock & Price |
FEATURES
1●2 Adaptive Hysteresis
● Single Supply Operation
● Ground Referenced Input
● True Zero Crossing Timing Reference
● Operates from 2V to 12V Supply Voltage
● Handles Inputs from 100 mVP-P to over 120VP-P with External Resistor
● CMOS Compatible Logic
APPLICATIONS
● Position Sensing with Notched Wheels● Zero Crossing Switch
● Motor Speed Control
● Tachometer
● Engine Testing
DESCRIPTION
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. 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 150mVP-P. Connection Diagram Figure 1. Top View 14-Lead SOIC or PDIP See D or NFF0014A Package These devices have limited built-in ESD protection.
