MAX9924UAUB+ Maxim Integrated Products, MAX9924UAUB+ Datasheet

IC SENSOR INTERFACE VARI 10MSOP

MAX9924UAUB+

Manufacturer Part Number
MAX9924UAUB+
Description
IC SENSOR INTERFACE VARI 10MSOP
Manufacturer
Maxim Integrated Products
Type
Sensor Interfacer
Datasheet

Specifications of MAX9924UAUB+

Input Type
Differential
Output Type
Logic
Interface
Differential
Current - Supply
5mA
Mounting Type
Surface Mount
Package / Case
10-MSOP, Micro10™, 10-uMAX, 10-uSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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
available in the 16-pin QSOP package. All devices are
specified over the -40°C to +125°C automotive temper-
ature range.
19-4283; Rev 3; 3/11
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.
Differential Input and Adaptive Peak Threshold
®
Camshaft VRS Interfaces
Crankshaft VRS Interfaces
Vehicle Speed VRS Interfaces
package, while the MAX9926/MAX9927 are
Variable Reluctance Sensor Interfaces with
________________________________________________________________ Maxim Integrated Products
ENGINE BLOCK
VR SENSOR
General Description
Applications
DIFFERENTIAL
AMPLIFIER
o Differential Input Stage Provides Enhanced Noise
o Precision Amplifier and Comparator Allows
o User-Enabled Internal Adaptive Peak Threshold or
o Zero-Crossing Detection Provides Accurate
+ Denotes a lead(Pb)-free/RoHS-compliant package.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
MAX9924UAUB
MAX9925AUB
MAX9926UAEE
MAX9927AEE
MAX9924UAUB+
MAX9925AUB+
MAX9926UAEE+
MAX9927AEE+
ADAPTIVE/MINIMUM
Immunity
Small-Signal Detection
Flexible External Threshold
Phase Information
ZERO-CROSSING
THRESHOLDS
PART
AND
PART
INTERNAL/EXTERNAL
BIAS VOLTAGE
Simplified Block Diagram
MAX9924
Ordering Information
1 x Operational
2 x Operational
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
1 x Differential
2 x Differential
TEMP RANGE
AMPLIFIER
Selector Guide
10 µMAX
10 µMAX
16 QSOP
16 QSOP
PIN-PACKAGE
Features
Externally Set
Externally Set
μC
GAIN
1V/V
1V/V
1

Related parts for MAX9924UAUB+

MAX9924UAUB+ Summary of contents

Page 1

... 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 PART MAX9924UAUB+ MAX9925AUB+ MAX9926UAEE+ MAX9927AEE+ + Denotes a lead(Pb)-free/RoHS-compliant package. PART MAX9924UAUB MAX9925AUB MAX9926UAEE ...

Page 2

Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold ABSOLUTE MAXIMUM RATINGS V to GND .............................................................-0. All Other Pins..............................................-0. Current into IN+, IN-, IN_+, IN_-.......................................±40mA Current into All Other Pins ................................................±20mA Output ...

Page 3

Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold ELECTRICAL CHARACTERISTICS (continued 5V 0V, MAX9925/MAX9927 gain setting = 1V/V, Mode A1 GND 50pF unless otherwise noted. ...

Page 4

Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold ELECTRICAL CHARACTERISTICS (continued 5V 0V, MAX9925/MAX9927 gain setting = 1V/V, Mode A1 GND 50pF unless otherwise noted. ...

Page 5

Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold ( 0V, MAX9925/MAX9927 gain setting = 1V/V. All values are GND INPUT OFFSET VOLTAGE DISTRIBUTION BIN SIZE ...

Page 6

Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold ( 0V, MAX9925/MAX9927 gain setting = 1V/V. All values are GND MINIMUM AND ZERO-CROSSING THRESHOLD vs. TEMPERATURE 2.5V CM ...

Page 7

Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold PIN MAX9924 MAX9925 MAX9926 MAX9927 1 1 — — — 3 — 3 — — — — ...

Page 8

Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold V CC 100kΩ IN 100kΩ IN+ INTERNAL REFERENCE 2.5V BIAS 8 _______________________________________________________________________________________ 100kΩ OP AMP 100kΩ COMPARATOR BUFFER 30% PEAK DETECTOR V MIN THRESHOLD MODE LOGIC INT_THRS ...

Page 9

Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold IN+ BIAS BUFFER _______________________________________________________________________________________ Functional Diagrams (continued) OUT MAX9925 OP AMP COMPARATOR 30% PEAK DETECTOR V MIN THRESHOLD EXT V CC GND 85ms COUT ...

Page 10

Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold V CC 100kΩ IN1 100kΩ IN1+ INTERNAL REFERENCE 2.5V BIAS1 EXT1 V CC 100kΩ IN2 100kΩ IN2+ BIAS2 EXT2 10 ______________________________________________________________________________________ Functional Diagrams (continued) 100kΩ ...

Page 11

Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold V CC IN1 IN1+ BIAS1 BUFFER V CC IN2 IN2+ BIAS2 BUFFER ______________________________________________________________________________________ Functional Diagrams (continued) OUT1 MAX9927 OP AMP COMPARATOR 30% PEAK DETECTOR V ...

Page 12

Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold Detailed Description The MAX9924–MAX9927 interface with variable reluc- tance (VR) or magnetic coil sensors. These devices produce accurate pulses aligned with flywheel gear- teeth even when the pickup signal ...

Page 13

Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold Differential Amplifier The input operational amplifier is a rail-to-rail input and output precision amplifier with CMOS input bias cur- rents, low offset voltage (V ) and drift. A novel ...

Page 14

Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold The zero-crossing signal provides true timing informa- tion for engine-control applications. The zero-voltage level in the VR sensor signal corresponds to the center of the gear-tooth and is the ...

Page 15

Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold 10kΩ VR SENSOR 10kΩ 1kΩ 10μF || 0.1μF Figure 2. MAX9924/MAX9926 Operating Mode A1 10kΩ VR SENSOR 10kΩ Figure 3. MAX9924/MAX9926 Operating Mode A2 ______________________________________________________________________________________ IN+ 1nF COUT IN- ...

Page 16

Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold 10kΩ VR SENSOR 10kΩ 1kΩ 10μF || 0.1μF Figure 4. MAX9924/MAX9926 Operating Mode B 10kΩ VR SENSOR 10kΩ 1kΩ 10μF || 0.1μF Figure 5. MAX9924/MAX9926 Operating Mode C 16 ...

Page 17

Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold 10kΩ VR 1nF SENSOR 10kΩ 1kΩ 10μF || 0.1μF Figure 6. MAX9925/MAX9927 Operating Mode A 10kΩ VR 1nF SENSOR 10kΩ 1kΩ 10μF || 0.1μF Figure 7. MAX9925/MAX9927 Operating Mode ...

Page 18

Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold 10kΩ VR 1nF SENSOR 10kΩ 1kΩ 10μF || 0.1μF Figure 8. MAX9925 Operating Mode C 18 ______________________________________________________________________________________ Application Circuits (continued) OUT IN- COUT IN+ MAX9925 BIAS 1kΩ V +5V ...

Page 19

Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold VR SENSOR ______________________________________________________________________________________ 4. 100kΩ 100kΩ IN AMP 100kΩ IN+ 100kΩ BANDGAP REFERENCE VOLTAGE = BUFFER ...

Page 20

Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold TOP VIEW + IN_THRS1 1 EXT1 2 BIAS1 3 MAX9926 COUT1 4 COUT2 5 BIAS2 6 EXT2 7 INT_THRS2 8 QSOP TOP VIEW + IN+ 1 IN- 2 N.C. ...

Page 21

Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold For the latest package outline information and land patterns (footprints www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package ...

Page 22

Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold For the latest package outline information and land patterns (footprints www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package ...

Page 23

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 23 © 2011 Maxim Integrated Products ...

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