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MAX9927 Datasheet

Variable Reluctance Sensor Interfaces

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MAX9924–MAX9927
Variable Reluctance Sensor Interfaces with
Differential Input and Adaptive Peak Threshold
General Description
The MAX9924–MAX9927 variable reluctance (VR or
magnetic coil) sensor interface devices are ideal for posi-
tion and speed sensing for automotive crankshafts, cam-
shafts, transmission shafts, etc. These devices integrate a
precision amplifier and comparator with selectable adap-
tive 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 avail-
able in the 16-pin QSOP package. All devices are specified
over the -40°C to +125°C automotive temperature range.
μMAX is a registered trademark of Maxim Integrated Products, Inc.
Simplified Block Diagram
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
Applications
● Camshaft VRS Interfaces
● Crankshaft VRS Interfaces
● Vehicle Speed VRS Interfaces
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX9924UAUB+
-40°C to +125°C 10 µMAX
MAX9924UAUB/V+ -40°C to +125°C 10 µMAX
MAX9925AUB+
-40°C to +125°C 10 µMAX
MAX9926UAEE+
-40°C to +125°C 16 QSOP
MAX9926UAEE/V+ -40°C to +125°C 16 QSOP
MAX9927AEE+
-40°C to +125°C 16 QSOP
MAX9927AEE/V+ -40°C to +125°C 16 QSOP
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
ENGINE BLOCK
VR SENSOR
DIFFERENTIAL
AMPLIFIER
MAX9924
ADAPTIVE/MINIMUM
AND
ZERO-CROSSING
THRESHOLDS
INTERNAL/EXTERNAL
BIAS VOLTAGE
µC
19-4283; Rev 5; 8/18


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX9927 Datasheet

Variable Reluctance Sensor Interfaces

No Preview Available !

MAX9924–MAX9927
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
Operating Temperature Range.......................... -40°C to +125°C
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -65°C to +150°C
Current into All Other Pins................................................±20mA
Lead Temperature (soldering, 10s).................................. +300°C
Output Short-Circuit (OUT_, OUT) to GND............................ 10s
Soldering Temperature (reflow)........................................+260°C
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
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 http://www.maximintegrated.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
POWER SUPPLY
Operating Supply Range
Supply Current
SYMBOL
CONDITIONS
VCC
ICC
(Note 3)
MAX9924/MAX9925
MAX9926/MAX9927
MIN TYP MAX UNITS
4.5 5.5 V
2.6 5
mA
4.7 10
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
Input Bias Current
Input Offset Current
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Output Voltage Low
IBIAS
IOFFSET
CMRR
PSRR
VOL
(Note 4)
(Note 4)
From VCM = 0 to VCC
MAX9925
MAX9927
IOL = 1mA
Output Voltage High
VOH
IOH = -1mA
30 150 µs
0
VCC
V
5 µV/°C
0.5 3 mV
0.1
0.05
6
2
nA
nA
75 102
88 105
77 94
dB
dB
0.050
V
VCC
-0.050
V
Recovery Time from Saturation
tSAT
To 1% of the actual VOUT after output
saturates
1.2
µs
Gain-Bandwidth Product
Slew Rate
Charge-Pump Frequency
GBW
SR
fCP
1.4 MHz
2.3 V/µs
1.3 MHz
www.maximintegrated.com
Maxim Integrated 2


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