MAX9925AUB+T

Sensor And Detector Interfaces Overview

The MAX9925AUB+T is a single-channel variable reluctance sensor interface device designed for automotive position and speed sensing applications. It integrates a precision operational amplifier, comparator, adaptive peak threshold circuit, and zero-crossing detection logic within a 10-pin μMAX package. The device operates on a supply voltage ranging from 4.5V to 5.5V with a typical supply current of 2.6mA. It features an input offset voltage of 0.5mV to 3mV, a gain-bandwidth product of 1.4MHz, and a slew rate of 2.3V/µs. The component supports an operating temperature range from -40°C to +125°C.

Sensor And Detector Interfaces Feature Summary

• Integrates a precision operational amplifier with externally configurable gain settings via accessible internal terminals.
• Features an adaptive peak threshold mechanism that adjusts sensitivity cycle-by-cycle to maintain robust noise immunity against weak signals or system interference.
• Includes zero-crossing detection capability to provide accurate phase information essential for engine control timing.

Sensor And Detector Interfaces Applications

• Camshaft Variable Reluctance Sensor (VRS) interfaces
• Crankshaft Variable Reluctance Sensor (VRS) interfaces
• Vehicle speed sensing systems

Sensor And Detector Interfaces Procurement Notes

Verify the specific ordering suffix and package type when sourcing components. Confirm that the device meets the required automotive qualification standards for the intended application environment. Check for lead-free compliance documentation to ensure adherence to environmental regulations. Validate the supplier's authenticity through authorized distribution channels to prevent counterfeit parts.

Sensor And Detector Interfaces Selection Notes

Select this model when external gain configuration flexibility is required, as it exposes all operational amplifier terminals unlike the fixed-gain MAX9924. Ensure the design accommodates the necessary external resistors for setting the differential amplifier gain. Consider the power supply decoupling requirements specified in the datasheet to maintain signal integrity during operation.

Sensor And Detector Interfaces Part Context

This component belongs to the MAX9924–MAX9927 family of variable reluctance sensor interfaces. While the MAX9924 offers fixed gain with integrated matched resistors, the MAX9925 provides greater flexibility by making all three operational amplifier terminals available for external gain setting. Both devices share similar packaging and thermal characteristics within the same automotive temperature range.

Sensor And Detector Interfaces Replacement Considerations

The MAX9924UAUB+T serves as a functional alternative if fixed gain is acceptable. For dual-channel applications requiring rotational direction output, the MAX9927AEE+T is the corresponding dual version. Verify pin compatibility and external component requirements before substituting.