The UDA1351TS is a single chip IEC 958 audio decoder with an integrated stereo DAC employing bitstream conversion techniques. A lock indication signal is available on pin LOCK, indicating that the IEC 958 decoder is locked. This pin is also used to indicate whether PCM data is applied to the input or not. When non-PCM data is detected, the device indicates out-of-lock. By default, the DAC output and the data output interface are muted when the decoder is out-of-lock. However, this setting can be overruled in the L3 control mode.