263 Time to Digital Converter
263 : Time to Digital Converter
- Author: Jeremiasz Hauck
- Description: Phase difference measuring circuit with digital output
- GitHub repository
- Clock: 0 Hz
How it works
A Pseudo-Differential Time to Digital Converter (TDC)
How to test
The TDC has one analog input that is then split into start and stop signals. Because this TDC has a resolution of around 80 ps, it would be difficult to provide signals with such a small phase difference, that is why there is an extra variable delay circuit that delays the stop signal relative to the start signal. You can change the stop signal delay by configuring the digital input. To test the circuit drive the stop signal for a given configuration of delay.
External hardware
No external hardware needed.
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | stop fine delay 0 | tdc bit 0 | stop coarse delay 4 |
| 1 | stop fine delay 1 | tdc bit 1 | start fine delay 0 |
| 2 | stop fine delay 2 | tdc bit 2 | start fine delay 1 |
| 3 | stop fine delay 3 | tdc bit 3 | start fine delay 2 |
| 4 | stop coarse delay 0 | tdc bit 4 | start fine delay 3 |
| 5 | stop coarse delay 1 | tdc bit 5 | start enable |
| 6 | stop coarse delay 2 | tdc bit 6 | |
| 7 | stop coarse delay 3 | tdc bit 7 |
Analog pins
ua | PCB Pin | Internal index | Description |
|---|---|---|---|
| 0 | B5 | 11 | stop |