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LM1815

    Adaptive Variable Reluctance Sensor Amplifier
Generic P/N 1815

Contents


General Description

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 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 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.

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 150mVP-P.


Features

  • 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

Datasheet

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LM1815 Adaptive Variable Reluctance Sensor Amplifier 170 Kbytes 7-Jun-01 View Online Download Receive via Email

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Package Availability, Models, Samples & Pricing

Part NumberPackageStatusModelsSamples
&
Electronic
Orders
Budgetary PricingStd
Pack
Size
Package
Marking
Type# pinsSPICEIBISQuantity$US each
LM1815MSOIC NARROW(MCM)14Full productionN/AN/ASamples
Buy Now
1K+$1.8000tube
of
55
[logo]¢U¢Z¢2¢T
LM1815M
LM1815NMDIP(MCM)14Full productionN/AN/A24 Hour Samples
Buy Now
1K+$1.8000tube
of
25
[logo]¢U¢Z¢3¢T
LM1815N

[Information as of 27-Oct-2001]
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