[Patu]

What chip is used in this DAC?

PCM side is built around eight BB1795 chips and DSD is their own design. DSD side is IMO the crown jewel of DAC200.

 

[TheOneInYellow]

What chip is used in this DAC?

Take a look at this reply by @GoldenSound, who also did a fantastic review (with good critique) of the T+A D200.

Not quite.

The PCM1795 DAC uses Burr Brown's 'advance segment' architecture.
The simplest way to explain this is that the top 6 bits are converted 'as is', but the lower 18 bits are converted using a 1-bit delta sigma modulator that modulates to the level of 1 LSB (least significant bit) of the top portion.

I've got a bit more of an in depth explanation about two thirds through this post on the Teac UD501 which uses the same chip and also has the same filter bypass option:
https://goldensound.audio/2021/12/02/teac-ud501-dac-review-measurements/

Though worth noting the DAC200 avoids some of the issues present in that unit, particularly when running with the unit in 'NOS'.

The chip does NOT modulate to 1-bit entirely, it's a multibit conversion just a bit of a hybrid approach.
Most DACs will modulate the entire signal to 5-bit usually, whereas this separates the 6 MSB (most significant bits) and the lower 18 LSB (least significant bits) and handles them separately

With PCM, the 1-bit DSD converter is not used.
With DSD, the data is fed un-altered to the 1-bit DSD converter and the PCM1795 chip is not in use. They are entirely separate DACs / signal paths.