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MAX9924, MAX9925, MAX9926, MAX9927

Variable-Reluctance Sensor Interface with Differential Input and Adaptive Peak Threshold

Industry's First Single-Chip Solution for Variable-Reluctance Sensor Interface and Adaptive Peak Threshold
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Active: In Production.


The MAX9924–MAX9927 variable reluctance (VR or magnetic coil) sensor interface devices are ideal for position and speed sensing for automotive crankshafts, camshafts, transmission shafts, etc. These devices integrate a precision amplifier and comparator with selectable adaptive peak threshold and zero-crossing circuit blocks that generate robust output pulses even in the presence of substantial system noise or extremely weak VR signals.

The MAX9926/MAX9927 are dual versions of the MAX9924/MAX9925, respectively. The MAX9924/MAX9926 combine matched resistors with a CMOS input precision operational amplifier to give high CMRR over a wide range of input frequencies and temperatures. The MAX9924/MAX9926 differential amplifiers provide a fixed gain of 1V/V. The MAX9925/MAX9927 make all three terminals of the internal operational amplifier available, allowing greater flexibility for gain. The MAX9926 also provides a direction output that is useful for quadrature-connected VR sensors that are used in certain high-performance engines. These devices interface with both new-generation differential VR sensors as well as legacy single-ended VR sensors.

The MAX9924/MAX9925 are available in the 10-pin µMAX® package, while the MAX9926/MAX9927 are available in the 16-pin QSOP package. All devices are specified over the -40°C to +125°C automotive temperature range.

Data Sheet

Download this datasheet in PDF formatDownload Rev 4 (PDF, 343.1kB)
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An evaluation board is available: MAX9924UEVKIT MAX9926UEVKIT

Key Features

  • Differential Input Stage Provides Enhanced Noise Immunity
  • Precision Amplifier and Comparator Allows Small-Signal Detection
  • User-Enabled Internal Adaptive Peak Threshold or Flexible External Threshold
  • Zero-Crossing Detection Provides Accurate Phase Information


  • Camshaft VRS Interfaces
  • Crankshaft VRS Interfaces
  • Vehicle Speed VRS Interfaces

Key Specifications:

Sensor Interface Devices
Part Number Sensor Interface Type Channels VSUPPLY
Low Pwr. Shutdn Oper. Temp.
min max typ See Notes
MAX9924  Variable Reluctance 1 4.5 5.5 2600 No -40 to +125 $2.57 @1k
MAX9925  1 2600 $1.21 @1k
MAX9926  2 4700 $3.42 @1k
MAX9927  2 4700 $2.26 @1k
See All Sensor Interface Devices (10)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX9924, MAX9925, MAX9926, MAX9927: Simplified Block Diagram
Simplified Block Diagram

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Information Index

Document Ref.: 19-4283 Rev 4; 2012-05-07
This page last modified: 2012-05-07