Time-to-Digital Converter Without RTC

Accurate Low-Flow Measurement with Low Power Consumption

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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.
MAX35102: System Block Diagram MAX35102: System Block Diagram Enlarge+

Key Features

  • 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


  • Ultrasonic Gas Meters
  • Ultrasonic Heat Meters
  • Ultrasonic Water Meters

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Product Reliability Reports: MAX35102.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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