MAX9927 Datasheet | Maxim Integrated

Click here for production status of specific part numbers. 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 position and speed sensing for automotive crankshafts, camshafts, transmission shafts, etc. These devices integrate a precision amplifier and parator 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 bine 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 quadratureconnected VR sensors that are used in certain highperformance 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 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 parator 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 -...