MAX35101EHJ+

Overview

The MAX35101EHJ+ is a time-to-digital converter with an integrated analog front-end designed for ultrasonic heat and flow meters. It operates on a single supply voltage ranging from 2.3V to 3.6V within an industrial temperature range of -40°C to +85°C. The device provides a time measurement accuracy of 20ps with a resolution of 3.8ps, supporting a measurement range up to 8ms. It features two channels for single-stop differential time-of-flight measurements and supports up to four 2-wire PT1000/500 RTD sensors. Power consumption is minimized at 10μA during TOF measurement and less than 125nA in duty-cycled temperature mode.

Feature Summary

• Integrated analog front-end with built-in amplifier and comparator for simplified liquid flow computation
• Event timing mode enables cyclic algorithms to minimize microprocessor interactivity and extend battery life
• On-board 8KB nonvolatile flash memory allows for data logging and nonvolatile configuration recall via SPI
• Early edge detection ensures consistent wave pattern measurements to improve accuracy and eliminate errors

Applications

• Ultrasonic heat meters
• Ultrasonic water meters
• Ultrasonic gas meters

Procurement Notes

Verify the component status as End-of-Life or obsolete through official Analog Devices channels before finalizing designs. Confirm that the EHJ+ suffix corresponds to the TQFP-EP-32 package variant. Ensure compliance with RoHS directives by checking the specific manufacturing documentation. Request updated lifecycle notifications to mitigate supply chain risks associated with discontinued products.

Selection Notes

Select this component when designing systems requiring high-precision time-of-flight measurements for fluid metering applications. The integrated AFE reduces external component count compared to discrete solutions. Verify that the host microcontroller supports the required 4-wire SPI interface. Ensure the application environment remains within the specified -40°C to +85°C operating temperature range for optimal performance.

Part Context

This part belongs to the MAX35101 series of time-to-digital converters manufactured by Analog Devices Inc./Maxim Integrated. It serves as a complete analog front-end solution specifically targeted at the ultrasonic metering market. The device integrates essential functions such as pulse launching, signal reception, and arithmetic logic to streamline system design.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult Analog Devices directly for potential obsolescence management strategies or alternative product recommendations.