MAX9927

PRODUCTION

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

Data Sheet (Rev. 5) Product Selection Table
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Overview

  • 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

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.

Applications

  • Camshaft VRS Interfaces
  • Crankshaft VRS Interfaces
  • Vehicle Speed VRS Interfaces
MAX9927
Variable-Reluctance Sensor Interface with Differential Input and Adaptive Peak Threshold
MAX9924, MAX9925, MAX9926, MAX9927: Simplified Block Diagram
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 1

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Evaluation Kits

MAX9926UEVKIT

Evaluation Kit for the MAX9926U

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Features and Benefits

  • Demonstrates the Operation of MAX9926U Modes A1, A2, and B
  • Evaluates Dual Differential and Single-Ended Variable-Reluctance (VR or Magnetic Pickup) Sensors
  • Demonstrates Zero Crossing, Peak Detection, Adaptive Threshold Mechanism, and Rotation Direction
  • Includes Lowpass Sensor Input Filters
  • Evaluates 5Hz to 25kHz VR Sensors
  • Fully Assembled and Tested

Product Details

The MAX9926U evaluation kit (EV kit) is a fully assembled and tested circuit board that contains a dual-channel differential variable-reluctance (VR or magnetic pickup) sensor interface circuit using a MAX9926U IC in a 16-pin QSOP package. The dual-channel interface circuit also features differential amplifiers for evaluating a pair of differential or single-ended VR sensor signals and provides a gain of 1. Input power to the EV kit circuit can be supplied by a 4.5V to 5.5V DC source. The MAX9926U IC temperature range is -40°C to +125°C. The EV kit uses automotive power-train safety-equipment-rated ceramic capacitors with a temperature range of -55°C to +125°C.

The MAX9926U EV kit circuit can be configured to demonstrate the MAX9926U IC's operation with internal adaptive peak threshold and zero-crossing detection modes, as well as to interface to a microcontroller pulse-width modulation (PWM) signal for evaluating external thresholds. It can interface to both differential as well as single-ended VR sensors. The EV kit can evaluate external VR signals from 5Hz to 25kHz.

Applications

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

MAX9924UEVKIT

Evaluation Kit for the MAX9924U and MAX9925

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Features and Benefits

  • Demonstrates MAX9924U MODE A1, A2, B, and C Operation
  • Evaluates Differential and Single-Ended Sensors (VR or Magnetic Pickup)
  • Demonstrates Zero-Crossing and Adaptive Threshold Mechanism
  • Includes Lowpass Sensor Input Filter
  • On-Board 5Hz/24kHz Triangle-Wave Generator
  • Evaluates MAX9925 (IC Replacement Required)
  • Lead(Pb)-Free and RoHS Compliant
  • Fully Assembled and Tested

Product Details

The MAX9924U evaluation kit (EV kit) is a fully assembled and tested PCB that contains a differential variable reluctance (VR) sensor interface circuit using a MAX9924U IC in a 10-pin µMAX® package. The single-channel interface circuit also features a differential amplifier for evaluating differential or single-ended VR sensor (magnetic pickup sensor) signal, and provides a fixed gain of 1V/V. Input power to the EV kit circuit can be supplied by a 4.5V to 5.5V DC source. The MAX9924U IC temperature range is -40°C to +125°C.

The MAX9924U EV kit circuit can be configured to demonstrate the MAX9924U IC's operation with internal adaptive peak threshold and zero-crossing detection modes. It can also interface to a microcontroller PWM signal for evaluating external thresholds. Additionally, a configurable on-board triangle-wave generator using a MAX9000 IC provides a 5Hz, 55Hz, 2.5kHz, or 24kHz triangle-wave signal if no external VR signal is available for evaluation.

Applications

  • Camshaft VRS Interfaces
  • Crankshaft VRS Interfaces
  • Vehicle Speed VRS Interfaces
MAX9926UEVKIT
Evaluation Kit for the MAX9926U
MAX9924UEVKIT
Evaluation Kit for the MAX9924U and MAX9925

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