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Time-to-Digital Converter Without RTC

Accurate Low-Flow Measurement with Low Power Consumption

Product Details

Key Features

Applications/Uses

Parametric specs for Sensor Signal Conditioners
Sensing Element Ultrasonic Piezoelectric Transducer
PGA Gain Fixed
Calibration Method External microcontroller
Output Type Digital
ICC (mA) (typ) 0.006
Interface SPI
VSUPPLY (V) 2.3 to 3.6
Package/Pins TQFN/32
Budgetary
Price (See Notes)
3.31
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Simplified Block Diagram

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Parameters

Parametric specs for Sensor Signal Conditioners
Sensing Element Ultrasonic Piezoelectric Transducer
PGA Gain Fixed
Calibration Method External microcontroller
Output Type Digital
ICC (mA) (typ) 0.006
Interface SPI
VSUPPLY (V) 2.3 to 3.6
Package/Pins TQFN/32
Budgetary
Price (See Notes)
3.31

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

Applications/Uses

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

Description

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.

Simplified Block Diagram

MAX35102: System Block Diagram MAX35102: System Block Diagram Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .