AKM AK4621EF CODEC by Asahi Kasei Microdevices. 115dB 192kHz 24-bit 2 ch ADC & 2 ch DAC with Low Latency Digital Filter. Website, Data sheet.

The AK4621EF is a high performance 24-bit CODEC that supports up to 192kHz recording and playback. The on-board analog-to-digital converter has a high dynamic range due to AKM’s Enhanced Dual-Bit architecture. (From the data sheet)

The DAC utilizes AKM’s Advanced Multi-Bit architecture that achieves low out-of-band noise and high jitter tolerance through the use of Switched Capacitor Filter (SCF) technology. (From the data sheet)