LM1815M/NOPB National Semiconductor, LM1815M/NOPB Datasheet

LM1815M/NOPB

Manufacturer Part Number

LM1815M/NOPB

Description

IC ADAPTIVE SENSE AMP 14SOIC

Manufacturer

National Semiconductor

Type

Sensor Interfacer

Datasheets

1.LM1815MNOPB.pdf (11 pages)

2.LM1815MNOPB.pdf (13 pages)

Specifications of LM1815M/NOPB

Package / Case

14-SOIC (3.9mm Width), 14-SOL

Mounting Type

Surface Mount

Current - Supply

6mA

Output Type

Logic

Input Type

Logic

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Interface

Other names

*LM1815M::*LM1815M/NOPB::LM1815M

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LM1815M/NOPB

Manufacturer:

SONY

Quantity:

1 140

Current page: 1 of 11
Download datasheet (769Kb)

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 am-

plifier 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 pro-

cessed (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 incoming

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

150mV

Connection Diagram

P-P

See NS Package Number M14A or N14A

DS007893

Order Number LM1815M or LM1815N

Top View

Features

n Adaptive hysteresis

n Single supply operation

n Ground referenced input

n True zero crossing timing reference

n Operates from 2V to 12V supply voltage

n Handles inputs from 100 mV

n CMOS compatible logic

Applications

n Position sensing with notched wheels

n Zero crossing switch

n Motor speed control

n Tachometer

n Engine testing

external resistor

00789301

P-P

to over 120V

www.national.com

March 2005

P-P

with

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