OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

MAX9927AEE/V+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23
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
MAX9924–MAX9927
Variable Reluctance Sensor Interfaces with
Differential Input and Adaptive Peak Threshold
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-4283; Rev 4; 3/12
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.
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
MAX9927
AEE+ -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.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Simplified Block Diagram
μC
DIFFERENTIAL
AMPLIFIER
ADAPTIVE/MINIMUM
AND
ZERO-CROSSING
THRESHOLDS
INTERNAL/EXTERNAL
BIAS VOLTAGE
VR SENSOR
ENGINE BLOCK
MAX9924
MAX9924–MAX9927
Variable Reluctance Sensor Interfaces with
Differential Input and Adaptive Peak Threshold
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= 5V, V
GND
= 0V, MAX9925/MAX9927 gain setting = 1V/V, Mode A1, V
BIAS
= 2.5V, V
PULLUP
= 5V, R
PULLUP
= 1kΩ, C
COUT
=
50pF. T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
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.
V
CC
to GND.............................................................-0.3V to + 6V
All Other Pins..............................................-0.3V to (V
CC
+ 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 (T
A
= +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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
POWER SUPPLY
Operating Supply Range V
CC
(Note 3) 4.5 5.5 V
MAX9924/MAX9925 2.6 5
Supply Current I
CC
MAX9926/MAX9927 4.7 10
mA
Power-On Time P
ON
V
CC
> V
UVLO
= 4.1V, step time for V
CC
~ 1µs
30 150 µs
INPUT OPERATIONAL AMPLIFIER (MAX9925/MAX9927)
Input Voltage Range IN+, IN- Guaranteed by CMRR 0 V
CC
V
Temperature drift 5 µV/°C
Input Offset Voltage V
OS-OA
0.5 3 mV
Input Bias Current I
BIAS
(Note 4) 0.1 6 nA
Input Offset Current I
OFFSET
(Note 4) 0.05 2 nA
Common-Mode Rejection Ratio CMRR From V
CM
= 0 to V
CC
75 102 dB
MAX9925 88 105
Power-Supply Rejection Ratio PSRR
MAX9927 77 94
dB
Output Voltage Low V
OL
I
OL
= 1mA 0.050 V
Output Voltage High V
OH
I
OH
= -1mA
V
CC
-
0.050
V
Recovery Time from Saturation t
SAT
To 1% of the actual V
OUT
after output
saturates
1.2 µs
Gain-Bandwidth Product GBW 1.4 MHz
Slew Rate SR 2.3 V/µs
Charge-Pump Frequency f
CP
1.3 MHz
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
.
µMAX
Junction-to-Ambient Thermal Resistance (θ
JA
) ......113.1°C/W
Junction-to-Case Thermal Resistance (θ
JC
) ................42°C/W
QSOP
Junction-to-Ambient Thermal Resistance (θ
JA
) ......103.7°C/W
Junction-to-Case Thermal Resistance (θ
JC
) ................37°C/W
PACKAGE THERMAL CHARACTERISTICS (Note 1)
MAX9924–MAX9927
Variable Reluctance Sensor Interfaces with
Differential Input and Adaptive Peak Threshold
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
INPUT DIFFERENTIAL AMPLIFIER (MAX9924/MAX9926)
Input Voltage Range IN+, IN- Guaranteed by CMRR -0.3
V
CC
+
0.3
V
MAX9924 (Note 5) 60 87
Differential Amplifier
Common-Mode Rejection Ratio
CMRR
MAX9926 (Note 5) 55 78
dB
Input Resistance R
IN
(Note 5) 65 100 135 kΩ
ADAPTIVE PEAK DETECTION
MAX9924/MAX9925 -6.5 0 +6.5
Zero-Crossing Threshold V
ZERO_THRESH
Mode B
operation
(Notes 5, 6) MAX9926/MAX9927 -6.5 0 +10
mV
V
ADAPTIVE
Adaptive peak threshold 33 %PK
Minimum threshold of hysteresis
comparator MAX9924/MAX9926
(Notes 5, 6)
41530
Minimum threshold of hysteresis
comparator MAX9925/MAX9927
(Notes 5, 6)
20 30 50
V
MIN-THRESH
- V
ZERO-THRESH
for
MAX9924 (Notes 5, 6)
71526
V
MIN-THRESH
- V
ZERO-THRESH
for
MAX9926 (Notes 5, 6)
21530
Fixed and Adaptive Peak
Threshold
V
MIN-THRESH
V
MIN-THRESH
- V
ZERO-THRESH
for
MAX9925/MAX9927 (Notes 5, 6)
19 30 50
mV
Watchdog Timeout for Adaptive
Peak Threshold
t
WD
Timing window to reset the adaptive
peak threshold if not triggered (input
level below threshold)
45 85 140 ms
ENTIRE SYSTEM
Comparator Output Low Voltage V
COUT_OL
0.2 V
t
PDZ
Overdrive = 2V to 3V, zero-crossing
50
Propagation Delay
t
PDA
Overdrive = 2V to 3V, adaptive peak
150
ns
COUT Transition Time t
HL-LH
2ns
Propagation Delay Jitter t
PD-JITTER
Includes noise of differential amplifier
and comparator, f = 10kHz,
V
IN
= 1V
P-P
sine wave
20 ns
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 5V, V
GND
= 0V, MAX9925/MAX9927 gain setting = 1V/V, Mode A1, V
BIAS
= 2.5V, V
PULLUP
= 5V, R
PULLUP
= 1kΩ, C
COUT
=
50pF. T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23

MAX9927AEE/V+

Mfr. #:
Buy MAX9927AEE/V+
Manufacturer:
Maxim Integrated
Description:
Sensor Interface Variable-Reluctance Sensor Interface
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet