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MAX9926

Description
Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold
File Size366KB,24 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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MAX9926 Overview

Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold

19-4283; Rev 3; 3/11
Variable Reluctance Sensor Interfaces with
Differential Input and Adaptive Peak Threshold
General Description
The MAX9924–MAX9927 variable reluctance (VR or mag-
netic coil) sensor interface devices are ideal for position
and speed sensing for automotive crankshafts,
camshafts, transmission shafts, etc. These devices inte-
grate 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 ter-
minals 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-per-
formance 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 temper-
ature range.
Features
o
Differential Input Stage Provides Enhanced Noise
Immunity
o
Precision Amplifier and Comparator Allows
Small-Signal Detection
o
User-Enabled Internal Adaptive Peak Threshold or
Flexible External Threshold
o
Zero-Crossing Detection Provides Accurate
Phase Information
MAX9924–MAX9927
Ordering Information
PART
MAX9924UAUB+
MAX9925AUB+
MAX9926UAEE+
MAX9927AEE+
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
10 µMAX
10 µMAX
16 QSOP
16 QSOP
+Denotes
a lead(Pb)-free/RoHS-compliant package.
Selector Guide
PART
MAX9924UAUB
MAX9925AUB
MAX9926UAEE
MAX9927AEE
AMPLIFIER
1 x Differential
1 x Operational
2 x Differential
2 x Operational
GAIN
1V/V
Externally Set
1V/V
Externally Set
Applications
Camshaft VRS Interfaces
Crankshaft VRS Interfaces
Vehicle Speed VRS Interfaces
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Simplified Block Diagram
ENGINE BLOCK
MAX9924
VR SENSOR
DIFFERENTIAL
AMPLIFIER
ADAPTIVE/MINIMUM
AND
ZERO-CROSSING
THRESHOLDS
INTERNAL/EXTERNAL
BIAS VOLTAGE
μC
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

MAX9926 Related Products

MAX9926 MAX9924 MAX9925 MAX9926UAEE MAX9927 MAX9924UAUB MAX9924_11 MAX9925AUB MAX9927AEE
Description Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold
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