LM1815N National Semiconductor, LM1815N Datasheet

LM1815N

Manufacturer Part Number

LM1815N

Description

Amplifier IC

Manufacturer

National Semiconductor

Datasheet

1.LM1815N.pdf (11 pages)

Specifications of LM1815N

No. Of Amplifiers

No. Of Pins

Peak Reflow Compatible (260 C)

Input Bias Current

5ÂµA

Supply Voltage

12V

Leaded Process Compatible

Package / Case

14-DIP

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LM1815N/NOPB

Manufacturer:

ADI

Quantity:

1 679

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

Related parts for LM1815N

LM1815N Summary of contents

Page 1

... CMOS compatible logic Applications n Position sensing with notched wheels n Zero crossing switch n Motor speed control n Tachometer n Engine testing Top View Order Number LM1815M or LM1815N See NS Package Number M14A or N14A DS007893 March 2005 to over 120V with P-P P-P 00789301 www.national.com ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Power Dissipation (Note 2) Operating Temperature Range Electrical Characteristics Parameter Operating Supply Voltage Supply Current Pin 3 = -0.1V, Pin 9 = 2V, Pin 11 = 0.8V ...

Page 3

Typical Performance Characteristics Mode 1 Minimum Arming Threshold vs Temperature Mode 3 Minimum Arming Threshold vs Temperature Mode 2 Minimum Arming Threshold Mode 2 Minimum Arming Threshold 00789305 Mode 1 Minimum Arming Threshold 00789307 00789309 3 vs ...

Page 4

Typical Performance Characteristics Pin 10kΩ SIGNAL IN Pin 50kΩ SIGNAL IN Peak Detector Charge Current vs Temperature www.national.com (Continued 00789311 Pin 3 ...

Page 5

Typical Performance Characteristics Peak Detector Voltage vs Pin Mode 1 IN (Continued) Peak Detector Voltage vs Pin 3 V 00789317 Peak Detector Voltage vs Pin Mode 3 IN 00789319 5 , Mode 2 IN ...

Page 6

Truth Table Signal Input Pin 3 ± Pulses X X ± Pulses www.national.com RC Input Timing Timing Select Input Pin 14 Pin 11 Pin FIGURE 1. LM1815 ...

Page 7

7 www.national.com ...

Page 8

Application Hints INPUT VOLTAGE CLAMP The signal input voltage at pin 3 is internally clamped. Cur- rent limit for the Input pin is provided by an external resistor which should be selected to allow a peak current of normal operation. ...

Page 9

Application Hints (Continued) MODE 2, PIN 5 CONNECTED TO V+ The input arming threshold is fixed at 200mV minimum when device pin 5 is connected to the positive supply. The chip has ± no output for signals of less than ...

Page 10

Physical Dimensions unless otherwise noted www.national.com inches (millimeters) 14-Lead Small Outline Circuit (M) Order Number LM1815M NS Package Number M14A 10 ...

Page 11

... Deutsch Tel: +49 (0) 69 9508 6208 English www.national.com Français Tel: +33 ( 8790 Molded Dual-In-Line Package (N) Order Number LM1815N NS Package Number N14A 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system affect its safety or effectiveness ...

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