Looking for a USB soundcard.

Hello everyone,
Does anyone know of a USB sound card with 24-bit support? Here's my situation:
I'm currently using an Olympus DM-720 digital voice recorder as a sound card pass-through connected to a PC. This is then connected to a Y-splitter cable (left and right channels) which goes to two Sony full range microphones positioned outside my window for creating an outdoor stream.
Unfortunately, the Olympus has a rather unpleasant 16-bit noise floor, also known as white noise. This is a limitation of 16-bit audio. At quiet recording levels, the annoying noise of the sound card becomes audible.
For years, I've been looking for a USB sound card with 24-bit support, more importantly, one with a stereo microphone input (TRS connector). While many products on Amazon advertise stereo inputs, my experience has been different. Everything I've tried so far has either had noticeable hiss or lacked a true stereo input.
I even tried the Creative Sound Blaster Play! 3 sound card, which turned out to be disappointing. Not only is it limited to 16-bit, 44.1kHz mono audio, but it also uses a TRRS combo jack, which isn't what I need. I specifically require a TRS connector.
Does anyone know of a product that meets these requirements? Ideally, I'd like to avoid XLR microphones as they introduce additional complexity and potential points of failure.
Thank you very much!

I don't even know that much about this sort of thing, so hopefully there are others that do.

Why would anyone answer a question about which doesn't know at all?