261 4-bit R2R DAC
261 : 4-bit R2R DAC
- Author: Vishal Bingi
- Description: It is a 4-bit R2R DAC with a sawtooth waveform driver
- GitHub repository
- Open in 3D viewer
- Clock: 0 Hz
- Feedback: ✅ 1
How it works
It is a simple 4-bit R2R DAC, which is driven externally by an openlane generated sawtooth waveform generator.
How to test
Drive externally: Set the "external data" input high to provide the DAC with external data. Then drive the 4 inputs and observe the analog output.
Drive with internal sawtooth wave generator: Set the "external data" input low to enable the sawtooth generator. A sawtooth wave should be seen on the analog output. To change the frequency of the sawtooth wave, set the inputs and then raise the "load divider" input.
External hardware
A multimeter to measure the output voltage on analog pin 0.
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | bit 0 | external data | |
| 1 | bit 1 | load divider | |
| 2 | bit 2 | ||
| 3 | bit 3 | ||
| 4 | |||
| 5 | |||
| 6 | |||
| 7 |
Analog pins
ua | PCB Pin | Internal index | Description |
|---|---|---|---|
| 0 | B1 | 7 | DAC output |
User feedback
- mattvenn: Tested with 10khz clock and saw a sawtooth wave as expected Link for more details