I sell one audio D/A Converter chip IC BURR-BROWN DIP-28 PCM63P-K.

The K version is the best of the line from the PCM63.

DYNAMIC RANGE, THD+N at –60dB Referred to Full Scale
PCM63P 96-100 dB
PCM63P-J 100-104 dB
PCM63P-K 104-108 dB !

The PCM63P is a precision 20-bit digital-to-analog
converter with ultra-low distortion (–96dB max with a
full scale output; PCM63P-K). Incorporated into the
PCM63P is a unique Colinear dual-DAC per channel
architecture that eliminates unwanted glitches and
other nonlinearities around bipolar zero. The PCM63P
also features a very low noise (116dB max SNR;
A-weighted method) and fast settling current output
(200ns typ, 2mA step) which is capable of 16-times
oversampling rates.
Applications include very low distortion frequency
synthesis and high-end consumer and professional
digital audio applications.