MAX9926UAEE+

MAX9926UAEE+ is a variable reluctance sensor interface with a differential input and adaptive peak threshold. It is ideal for position and speed sensing for automotive crankshafts, camshafts, transmission shafts, etc. This device integrates 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. It combines matched resistors with a CMOS input precision operational amplifier to give high CMRR over a wide range of input frequencies and temperatures. The MAX9926 also provides a direction output that is useful for quadrature-connected VR sensors that are used in certain high-performance engines. This device interfaces with both new-generation differential VR sensors as well as legacy single-ended VR sensors. Applications include camshaft VRS interfaces, crankshaft VRS interfaces, and vehicle speed VRS interfaces.

• 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
• Operating supply range from 4.5 to 5.5V
• Supply current is 4.7mA typical at TA=+25°C
• Input offset voltage is 5µV/°C max at temperature drift
• Common-mode rejection ratio is 102dB typ at from VCM=0 to VCC
• 16 QSOP package
• Temperature range from -40°C to +125°C

Applications

Communications & Networking