LM1815 NSC | Alldatasheet
Document overview
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Technical content
Features
Y True zero crossing timing reference Y Operates from 2V to 12V supply voltage Y Handles inputs from 100 mV to over 120V with external resistor Y CMOS compatible logic
Applications
Y Position sensing with notched wheels Y Zero crossing switch Y Motor speed control Y Tachometer Y Engine testing Connection Diagram TL/H/7893–1 Top View Order Number LM1815M or LM1815N See NS Package Number M14A or N14A Truth Table Signal Input Timing Gated Input Select Input Output Pulses L X Pulses X H Pulses Pulses C1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.
Office/Distributors for availability and specifications. (DIP), 120 §C/W (SO-14) junction to ambient. Note 2: Temporary excursions to 150 §C can be tolerated. Note 3: Measured at input to external 18 k X resistor. IC contains 1 k X in series with a diode to attenuate the input signal. FIGURE 1. LM1815 Adaptive Sense Amplifier
TL/H/7893–4
FIGURE 2. LM1815 Oscillograms inputs (see R4, Q12, Q11 in internal schematic diagram). threshold varies depending on the connection at pin 5. 135 mVp-p, the input arming threshold is typically 45 mV. decreases in the input signal. going zero crossing when the threshold is exceeded. unaffected by the status of pin 11. patible. In addition, pins 9, 11 and 12 are TTL compatible. Pin 10 is not guaranteed to drive a TTL load.
Physical Dimensions inches (millimeters) 14-Lead Small Outline Integrated Circuit (M) Order Number LM1815M
LM1815 Adaptive Variable Reluctance Sensor Amplifier Physical Dimensions inches (millimeters) (Continued) Molded Dual-In-Line Package (N) Order Number LM1815N LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or 2. A critical component is any component of a life systems which, (a) are intended for surgical implant support device or system whose failure to perform can into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life failure to perform, when properly used in accordance support device or system, or to affect its safety or with instructions for use provided in the labeling, can effectiveness. be reasonably expected to result in a significant injury to the user. National Semiconductor National Semiconductor National Semiconductor National Semiconductor Corporation Europe Hong Kong Ltd. Japan Ltd.
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