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Merged
dihm merged 3 commits into from
Oct 17, 2025
Merged

Wiring docs #84

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eb00e00
Update breakout board to have an input buffer on the trigger line.
dihm Sep 19, 2025
5213d89
Update KiCAD project with proper header footprint (instead of sockets)
dihm Sep 26, 2025
eb8be26
Add polished wiring diagram to README along with 3D render of breakou…
dihm Sep 26, 2025
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18 changes: 18 additions & 0 deletions README.md
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Expand Up @@ -54,6 +54,24 @@ The mass storage device should unmount after the copy completes. Your Pico is no

## Usage

### Wiring

Here is a simplified wiring diagram showing the mapping between Pico pins and the AD9959.

![DDS Sweeper Wiring Diagram](/img/wiring_diagram.svg)

In the `dds-sweeper-board` directory is a KiCAD project for a simple carrier board
with a socket that aligns directly to the header pins of the AD9959 Eval board.
It is a recommended design for ensuring quality high-speed communication signals between the Pico and AD9959.

![DDS Sweeper Board](/img/dds-sweeper-board.png)

This board has a 3-pin header for connecting 3.3V and 1.8V to the TB1 header of the AD9959 Eval board,
as well as an SMA connected 1.8V for connection to the `AVDD` analog output power supplies of the board.
Note that the `AVDD` connections for each channel are electrically connected by the AD9959 Eval PCB,
meaning the 1.8V can be daisy chained with more SMA cables to power the `BG_VDD` and `CLK_VDD` inputs.


### Setup

When the DDS Sweeper is started, configuration is required before it can be used. It is often good to begin with a `reset` command, which resets the AD9959.
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