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README: add link to adapter PCB

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Steve Markgraf 2024-12-09 00:54:15 +01:00 • committed by GitHub
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@ -40,9 +40,11 @@ The data from the internal ADC is streamed out via USB. Default configuration is
This app contains a PIO program that reads the data from a 12-bit ADC connected to GP0-GP11, outputs the ADC clock on GP20, and packs the 12 bit samples to 16-bit words to achieve maximum throughput. This app contains a PIO program that reads the data from a 12-bit ADC connected to GP0-GP11, outputs the ADC clock on GP20, and packs the 12 bit samples to 16-bit words to achieve maximum throughput.
It is meant to be used with cheap AD9226 ADC boards. The default setting is overclocking the RP2350 to 320 MHz and driving the ADC with a 40 MHz clock. With higher overclocking up to 50.25 MHz ADC clock can be used. It is meant to be used with cheap AD9226 ADC boards. The default setting is overclocking the RP2350 to 320 MHz and driving the ADC with a 40 MHz clock. With higher overclocking up to 50.25 MHz ADC clock can be used.
This can be used for sampling the IF of a tuner/downcoverter, as a direct-sampling HF SDR, or for capturing a video signal e.g. with [vhsdecode](https://github.com/oyvindln/vhs-decode).
![Pico2 with AD9226 ADC board](https://steve-m.de/projects/hsdaoh/rp2350_external_adc.jpg) This can be used for sampling the IF of a tuner/downcoverter, as a direct-sampling HF SDR, or for capturing a video signal e.g. with [vhsdecode](https://github.com/oyvindln/vhs-decode).
For the vhsdecode use-case, there is also an [adapter PCB](https://github.com/Sev5000/Pico2_12bitADC_PCMAudio).
![Pico2 with AD9226 ADC board](https://steve-m.de/projects/hsdaoh/rp2350_external_adc_rot.jpg)
## Credits ## Credits