@User I will be happy to collaborate and can help you design the R2R DAC. I am currently a PhD student with Nanoelectronics masters and Electrical and Electronics Engineering bachelor's degree. Even though I am still learning on full asic design architecture. I can definitely help you design Opamps and DACs etc.

Hi Minhaz! Great to meet you

I'm curious why you're going for a R2R DAC opposed to a delta sigma DAC which is usually used in the audio bands?

I need ultrasonic frequencies up to 500kHz

you'd still probably need a buffer after the resistor ladder before going out to a pin.

ahh ok, thought it was lower frequency

@tnt yes, potentially, it could just be a voltage follower

the design of a delta sigma is in a lot of ways easier than an R2R which is why I brought it up. The delta sigma has all the complexity in digital and much reduced analogue matching and hard work to get good performance. But I don't think it's viable with the frequencies you've mentioned

@yrrapt yes it's annoying, there are a million I2S class D chips out there that are small for audio frequencies. I do most of my work at 330kHz

What kind of bit depth are you looking for ?

@tnt the idea is to have a script generate it from parameters. But to answer your question, 8 - 12 bits.

@jrsharp Hi, Nice meeting you too! Let's chat private, so that we don't spam this room. @tnt you can join too.