TDC-GP21 – ULTRASONIC FLOW CONVERTERS
TDC-GP21 – Time-to-Digital Converter with Integrated Analog Frontend
TDC-GP21 is a 2-channel TDC with additional analog elements like extended fire-pulse generator, zero-cross detection and analog switches for simplifying the use in ultrasonic flow meter applications.
High resolution, 3-fold multi-hit capability and good pulse pair resolution make this device a good fit for industrial applications like magnetostrictive sensors, range finders or ultrasonic heat meters. An optimized power management of the various units brings down the operating current to a few µA at 2Hz measuring rate.
GENERAL CIRCUIT FEATURES
Analog elements like a chopper stabilized comparator and analog switches simplify external circuits of ultrasonic flow meters in a significant manner. In parallel, measurement quality is improved and operating current is reduced. The fire pulse generator is extended, a new low-power 32 kHz oscillator driver is implemented and the temperature measuring unit is further improved. All in all, the TDC-GP21 is perfectly suited to design ultra-compact and low-cost ultrasonic flow meters and heat meters.
Ultrasonic Flow Converters (UFC)
TDC-GP21 Features
- 2-channel TDC with 22ps resolution
- Analog frontend for ultrasonic flow meters
- Chopper-stabilized low-offset comparator for zero crossing detection
- Precise windowing for hit selection
- Temperature measuring unit for PT1000 sensors
- QFN32 package
TDC-GP21 Benefits
- High precision
- Low power
- Few additional external component needed
TDC-GP21 Evaluation Kit
Product Properties
| Analog Frontend | Yes |
| Number of Hits | 3 |
| Resolution [ps] | 22 |
| Operating Supply Range | 2.5 to 3.6 |
| Interface | SPI |
| Ambient Temperature Range [°C] | -40 to +125 |
| Package | QFN32 |