Analog Devices Inc. MAX35103 Time-to-Digital Converter
Analog Devices MAX35103 Time-to-Digital Converter includes a 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 consumes about half the average power and increases the maximum ToF measurement frequency in event timing mode from 2Hz to 16Hz. With a time measurement accuracy of 20ps and automatic differential time-of-flight (ToF) measurement, the Analog Devices MAX35103 simplifies the computation of liquid flow. Average power consumption is the lowest available with ultra-low 5.5μA ToF measurement and < 125nA duty-cycled temperature measurement.
Features
- High-accuracy flow measurement for billing and leak detection
- Time-to-digital accuracy down to 20ps
- Measurement range up to 8ms
- Two channels - single-stop channel
- Maximizes battery life with low device and overall system power
- Ultra-low 5μA ToF measurement and <125nA duty-cycled temperature measurement
- Event timing mode reduces host microcontroller overhead to minimize system power consumption
- 2.3V to 3.6V single-supply operation
- High-accuracy temperature measurement for precise heat and flow calculations
- Up to four 2-wire sensors
- PT1000 and PT500 RTD support
- High-integration solution minimizes parts count and reduces BOM cost
- 8KB of nonvolatile Flash memory for data logging
- Built-in real-time clock
- Small, 5mm x 5mm, 32-pin TQFP package
- -40°C to +85°C operation
Applications
- Ultrasonic gas meters
- Ultrasonic heat meters
- Ultrasonic water meters
Typical Application Circuit
Published: 2026-06-03
| Updated: 2026-06-15