There’s no guarantee a generic converter will handle a headerless Aptina Bayer dump directly. DNG is based on TIFF/EP (ISO 12234-2), so in principle you can create one yourself, but you need more than the raw pixel values.

Besides the 16-bit GRBG sample data, a usable DNG typically needs metadata such as image dimensions, orientation/pixel geometry, black/white levels, and color information describing the sensor’s filter responses. Knowing only “GRBG” is not enough for accurate color; DNG commonly uses an embedded camera profile or equivalent calibration data.

Adobe publishes the DNG specification and provides a DNG SDK, so that’s the main place to start if you want to write a converter. A TIFF library can help with the container structure, since DNG is essentially TIFF/EP plus required raw-specific tags and metadata.

If you need sensor-specific details, Aptina’s documentation may provide what’s needed, though some information may require access through their documentation program or NDA.

So: yes, conversion is possible, but without the sensor metadata/profile, the result may open yet still produce poor or inaccurate color.