MAX35101EHJ+

The MAX35101EHJ+ from Analog Devices is a time-to-digital converter designed as a complete analog front-end (AFE) solution for ultrasonic heat and flow meter markets. It boasts a time measurement accuracy down to 20ps and supports automatic differential time-of-flight (TOF) measurements for simplified liquid flow computation.

This device integrates an amplifier, comparator, internal analog switches, an autozero amplifier/comparator, a real-time clock (RTC), and programmable receiver sensitivity. It supports up to four (4) 2-wire PT1000/500 platinum resistive temperature detectors (RTD) for high-accuracy temperature measurement, crucial for precise heat and flow calculations. The integrated RTC and event timing mode minimize microprocessor interaction, enhancing battery life.

With a measurement range up to 8ms and two channels, the MAX35101EHJ+ is suitable for applications requiring accurate flow measurement for billing and leak detection. It operates over a temperature range of -40°C to +85°C and is housed in a compact 32-TQFP (5x5mm) package, facilitating a minimal electrical bill of materials.

A simple 4-wire SPI interface allows for easy configuration by any microcontroller. The device also features 8KB of on-board user flash memory for nonvolatile configuration and data logging, allowing configurations to be recalled with a SPI command.