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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX9924 Datasheet

(MAX9924 - MAX9927) Variable Reluctance Sensor Interfaces

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19-4283; Rev 4; 3/12
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.
Applications
Camshaft VRS Interfaces
Crankshaft VRS Interfaces
Vehicle Speed VRS Interfaces
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
Ordering Information
PART
MAX9924 UAUB+
MAX9924 UAUB/V+
MAX9925 AUB+
MAX9926 UAEE+
MAX9926 UAEE/V+
MAX9927 AEE+
MAX9927 AEE/V+
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-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
10 µMAX
16 QSOP
16 QSOP
16 QSOP
16 QSOP
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Simplified Block Diagram
ENGINE BLOCK
VR SENSOR
DIFFERENTIAL
AMPLIFIER
MAX9924
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX9924 Datasheet

(MAX9924 - MAX9927) Variable Reluctance Sensor Interfaces

No Preview Available !

Variable Reluctance Sensor Interfaces with
Differential Input and Adaptive Peak Threshold
ABSOLUTE MAXIMUM RATINGS
VCC to GND .............................................................-0.3V to + 6V
All Other Pins..............................................-0.3V to (VCC + 0.3V)
Current into IN+, IN-, IN_+, IN_-.......................................±40mA
Current into All Other Pins ................................................±20mA
Output Short-Circuit (OUT_, OUT) to GND.............................10s
Continuous Power Dissipation (TA = +70°C) (Note 1)
10-Pin µMAX (derate 8.8mW/°C above +70°C) ........707.3mW
16-Pin QSOP (derate 9.6mW/°C above +70°C)........771.5mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
µMAX
Junction-to-Ambient Thermal Resistance (θJA) ......113.1°C/W
Junction-to-Case Thermal Resistance (θJC) ................42°C/W
QSOP
Junction-to-Ambient Thermal Resistance (θJA) ......103.7°C/W
Junction-to-Case Thermal Resistance (θJC) ................37°C/W
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
ELECTRICAL CHARACTERISTICS
(VCC = 5V, VGND = 0V, MAX9925/MAX9927 gain setting = 1V/V, Mode A1, VBIAS = 2.5V, VPULLUP = 5V, RPULLUP = 1kΩ, CCOUT =
50pF. TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
POWER SUPPLY
Operating Supply Range
Supply Current
VCC (Note 3)
MAX9924/MAX9925
ICC MAX9926/MAX9927
Power-On Time
PON
VCC > VUVLO = 4.1V, step time for VCC
~ 1µs
INPUT OPERATIONAL AMPLIFIER (MAX9925/MAX9927)
Input Voltage Range
IN+, IN-
Guaranteed by CMRR
Input Offset Voltage
VOS-OA
Temperature drift
MIN
4.5
0
Input Bias Current
Input Offset Current
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Output Voltage Low
Output Voltage High
IBIAS
IOFFSET
CMRR
PSRR
VOL
VOH
(Note 4)
(Note 4)
From VCM = 0 to VCC
MAX9925
MAX9927
IOL = 1mA
IOH = -1mA
75
88
77
VCC -
0.050
TYP
2.6
4.7
30
0.5
0.1
0.05
102
105
94
MAX UNITS
5.5 V
5
mA
10
150 µs
VCC
V
5 µV/°C
3 mV
6 nA
2 nA
dB
dB
0.050
V
V
Recovery Time from Saturation
Gain-Bandwidth Product
Slew Rate
Charge-Pump Frequency
tSAT
GBW
SR
fCP
To 1% of the actual VOUT after output
saturates
1.2 µs
1.4 MHz
2.3 V/µs
1.3 MHz
2 _______________________________________________________________________________________


Part Number MAX9924
Description (MAX9924 - MAX9927) Variable Reluctance Sensor Interfaces
Maker Maxim Integrated Products
Total Page 23 Pages
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