Time-to-Digital Converter Without RTC

The MAX35102 is a time-to-digital converter with built-in amplifier and comparator targeted as a low-cost, analog front-end solution for the ultrasonic heat meter and flow meter markets. It is similar to the MAX35101, but with a reduced feature set and without a real-time clock (RTC). The package size has been reduced to 4mm x 4mm x 0.75mm with 0.4mm pin pitch.

With a time measurement accuracy of 20ps and automatic differential time-of-flight (ToF) measurement, this device makes for simplified computation of liquid flow.

Power consumption is the lowest available with ultra-low 5.5µA ToF measurement and < 125nA duty-cycled temperature measurement.

Applications

* Ultrasonic Gas Meters * Ultrasonic Heat Meters * Ultrasonic Water Meters

* High-Accuracy Flow Measurement for Billing and Leak Detection

* Time-to-Digital Accuracy Down to 20ps

* Measurement Range Up to 8ms

* 2 Channels—Single-Stop Channel

* High-Accuracy Temperature Measurement for Precise Heat and Flow Calculations

* Up to Four 2-Wire Sensors

* PT1000 and PT500 RTD Support

* 40mK Accuracy

* Maximizes Battery Life with Low Device and Overall System Power

* Ultra-Low 5.5µA ToF measurement and < 125nA Duty-Cycled Temperature Measurement

* 2.3V to 3.6V Single-Supply Operation

* High-Integration Solution Minimizes Parts Count and Reduces BOM Cost

* Small, 4mm x 4mm, 32-Pin TQFN Package

* -40°C to +85°C Operation