The SSM2602 is a low power, high quality stereo audio codec for portable
digital audio applications. SSM2602 is pin to pin compatible with WM8731SEFL.
Note that SSM2602 is not recommended for new designs,instead we recommend the
SSM2603. The SSM2603 is almost identical to SSM2602. SSM2603 has a DAC mute pin
replacing the SPI Mode control pin on SSM2602 (Mode pin is also on WM8731).