Click here for production status of specific part numbers. MAX9924MAX9927 Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold General Description Features The MAX9924MAX9927 variable reluctance (VR or Differential Input Stage Provides Enhanced Noise magnetic coil) sensor interface devices are ideal for posi- Immunity tion and speed sensing for automotive crankshafts, cam- Precision Amplifier and Comparator Allows shafts, transmission shafts, etc. These devices integrate a Small-Signal Detection precision amplifier and comparator with selectable adap- User-Enabled Internal Adaptive Peak Threshold or tive peak threshold and zero-crossing circuit blocks that Flexible External Threshold generate robust output pulses even in the presence of Zero-Crossing Detection Provides Accurate substantial system noise or extremely weak VR signals. Phase Information The MAX9926/MAX9927 are dual versions of the MAX9924/MAX9925, respectively. The MAX9924/ Applications MAX9926 combine matched resistors with a CMOS input Camshaft VRS Interfaces precision operational amplifier to give high CMRR over a Crankshaft VRS Interfaces wide range of input frequencies and temperatures. The MAX9924/MAX9926 differential amplifiers provide a fixed Vehicle Speed VRS Interfaces gain of 1V/V. The MAX9925/MAX9927 make all three terminals of the internal operational amplifier available, Ordering Information allowing greater flexibility for gain. The MAX9926 also provides a direction output that is useful for quadrature- PART TEMP RANGE PIN-PACKAGE connected VR sensors that are used in certain high- MAX9924UAUB+ -40C to +125C 10 MAX performance engines. These devices interface with both MAX9924UAUB/V+ -40C to +125C 10 MAX new-generation differential VR sensors as well as legacy MAX9925AUB+ -40C to +125C 10 MAX single-ended VR sensors. MAX9926UAEE+ -40C to +125C 16 QSOP The MAX9924/MAX9925 are available in the 10-pin MAX9926UAEE/V+ -40C to +125C 16 QSOP MAX package, while the MAX9926/MAX9927 are avail- MAX9927AEE+ -40C to +125C 16 QSOP able in the 16-pin QSOP package. All devices are specified MAX9927AEE/V+ -40C to +125C 16 QSOP over the -40C to +125C automotive temperature range. +Denotes a lead(Pb)-free/RoHS-compliant package. /V denotes an automotive qualified part. MAX is a registered trademark of Maxim Integrated Products, Inc. Simplified Block Diagram ENGINE BLOCK MAX9924 DIFFERENTIAL VR SENSOR AMPLIFIER C ADAPTIVE/MINIMUM AND ZERO-CROSSING THRESHOLDS INTERNAL/EXTERNAL BIAS VOLTAGE 19-4283 Rev 5 8/18MAX9924MAX9927 Variable Reluctance Sensor Interfaces with Differential Input and Adaptive Peak Threshold Absolute Maximum Ratings V to GND ...........................................................-0.3V to + 6V Operating Temperature Range ......................... -40C to +125C CC All Other Pins ........................................... -0.3V to (V + 0.3V) Junction Temperature ......................................................+150C CC Current into IN+, IN-, IN +, IN - ......................................40mA Storage Temperature Range ............................ -65C to +150C Current into All Other Pins................................................20mA Lead Temperature (soldering, 10s) .................................+300C Output Short-Circuit (OUT , OUT) to GND ........................... 10s Soldering Temperature (reflow) .......................................+260C Continuous Power Dissipation (T = +70C) (Note 1) A 10-Pin MAX (derate 8.8mW/C above +70C) .......707.3mW 16-Pin QSOP (derate 9.6mW/C above +70C).......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) MAX QSOP Junction-to-Ambient Thermal Resistance ( ) .....113.1C/W Junction-to-Ambient Thermal Resistance ( ) .....103.7C/W JA JA Junction-to-Case Thermal Resistance ( ) ...............42C/W Junction-to-Case Thermal Resistance ( ) ...............37C/W JC JC 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