Variable-reluctance sensor conditioner for engine-speed and position sensing
The Analog Devices MAX9924UAUB/V+ is a sensor interface IC purpose-built for conditioning variable-reluctance (VR) magnetic pickup signals — the kind used in automotive crankshaft, camshaft, and transmission speed sensing. It takes a differential input from the VR coil and outputs a clean logic-level pulse train whose edge timing corresponds to the zero-crossing of the input signal. Key features include a differential input architecture that rejects common-mode noise from the long twisted-pair harness between sensor and ECU, and a logic-level output that interfaces directly to a microcontroller capture-timer input. The supply current is 5 mA, which keeps the thermal budget comfortable in a sealed ECU housing.
AEC-Q100 qualification and the 125°C ceiling
The /V+ suffix on the order code flags the AEC-Q100 automotive qualification. For a Tier-1 supplier populating a transmission-control or engine-management BOM, this is the gate: the part carries the stress-tested reliability data (pre- and post-condensation, high-temperature operating life, temperature cycling) that the PPAP submission requires. The part is ROHS3 compliant.
Package and mounting for the ECU assembly
The supplier device package is 10-uMAX/uSOP. This is a small-outline package suited for automated pick-and-place into an ECU PCB; the 10-pin count keeps the board area tight.