TDC-GP22: General Purpose Time to Digital Converter (TDC)
The TDC-GP22 time to digital converter is the perfect solution for consumer and industrial applications requiring low cost, high resolution, and exceptionally low current consumption. Applications like low cost range finders, magnetostrictive sensors, and automatic test equipment are just a sampling of the applications that can take advantage of this technology.
With single shot resolution of 22ps and a 4 ms measurement range, the TDC-GP22 has the resolution and timing range for many applications that require precise measurement, while still being a low cost part.
In Measurement Mode 1, the chip measures up to 4 events (hits) per channel with a minimum of zero nano seconds time difference between the channels. In Measurement Mode 2, the TDC-GP22 chip can measure up to 3 events (hits).
Like all the ScioSense TDCs, the TDC-GP22 offers low current consumption, which makes it perfect for battery-powered applications.
Advantages
- Ultra Low Current Consumption with only few µA.
- Up to 8 STOP Channels
- Automatic Calibration of the Measured Value
- External Reference Clock in the Range of 1 to 40 MHz.
TDC-GP22 Main Features
General Features
- 4-wire SPI interface
- 1 MHz continuous data rate max.
- I/O voltage 2.5 V to 3.6 V
- Core voltage 2.5 V to 3.6 V
- Temperature range – 40 °C to +125 °C
- QFN 32 package
Circuit Features
Measurement Mode 1
- 2 channels with typ. 90 ps resolution
- 1-channel double resolution with
typ . 45 ps - Range 3.5 ns (0 ns) to 2.5 µs
- 20 ns pulse-pair resolution, 4-fold multihit
- Up to 1 million measurements per second in measure mode 1
Measurement Mode 2
- 1 channel with typ. 90 ps resolution
- Double resolution mode with 45 ps, Quad resolution mode with 22 ps resolution
- Measurement range 500 ns to 4 ms
- 3-fold multihit capability with automatic processing of all 3 data
Temperature Measurement Unit
- Chopper-stabilized low-offset comparator, programmable, ±35 mV
First-wave detection: offset set zero automatically afterfirst wave, hit selection relative tofirst wave- First-wave pulse-width measurement for signal monitoring and bubble detection
- Integrated analog switches for input selection
- External circuit is reduced to 2 resistors and 2 capacitors
Special Functions
- Fire pulse generator, up to 127 pulses
- Trigger to rising and/or falling edge
- Precise stop enable by windowing
- Low-power 32 kHz oscillator (500 nA)
- Clock calibration unit
- 7×32 Bit EEPROM
Analog Input Circuit
- Chopper-stabilized low-offset comparator, programmable, ±35 mV
First-wave detection: offset set zero automatically afterfirst wave, hit selection relative tofirst wave- First-wave pulse-width measurement for signal monitoring and bubble detection
- Integrated analog switches for input selection
- External circuit is reduced to 2 resistors and 2 capacitors
FUNCTIONAL BLOCK DIAGRAM
Additional Information
TDC-GP22 Specification
Resolution
typ. 90 ps, 45 ps in double resolution mode, 22 ps in quad resolution mode (only Measure Mode 2)
OTHER SPECS
| Max data rate: | up to ½ million samples per second |
| Power supply voltage: | 2.5 V to 3.6 V |
| Operating temp: | -40°C to 125°C |
| Quiescent current: | < 0.1µA |
| INL: | < 0.1 LSB |
| DNL: | < 0.8 LSB |
GP22 DC PARAMETERS
TEMPRATURE MEASURING UNIT
TIME MEASURING UNIT
TDC-GP22 PRODUCT FACTS
| Analog Frontend |
Yes |
| First Wave Detection |
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 |
TDC-GP22 APPLICATIONS
- Gasmeters
- Watermeters
- Density and Level Sensors
Documentation & Downloads
Ordering Numbers
Product |
Part Number |
RoHS compl. |
PB Free |
Package |
Packing QTY |
Shipping Package |
| TDC-GP22 | TDC-GP22 1K T&R | Y | Y | QFN32 | 1000 | TAPE & REEL |
| TDC-GP22 | TDC-GP22 1K T&R | Y | Y | QFN32 | 5000 | TAPE & REEL |