The oscillator frequency can be trimmed by external control of the FREQ_ADJ pin.

To reduce interference problems while using radio receiver tuned within the AM band, change the switching frequency from nominal to higher values. Choose these values so that the nominal and the higher value switching frequencies together results in the fewest cases of interference throughout the AM band. Select the oscillator frequency by changing the FREQ_ADJ resistor value connected to GND in Primary mode, according to the description in the Section 7.3.

For peripheral mode operation, turn off the oscillator by pulling the FREQ_ADJ pin to AVDD. Doing so configures the OSC_I/O pins as inputs to be controlled from an external differential clock. In a multiple device system, inter-channel delay is automatically set up between the switching of the audio channels, which can be illustrated by no idle channels switching at the same time. Doing so will not influence the audio output, but only the switch timing to minimize noise coupling between audio channels through the power supply to optimize audio performance and to get better operating conditions for the power supply. The inter-channel delay will be set up for a peripheral device depending on the polarity of the OSC_I/O connection such that a secondary is selected by connecting the primary device OSC_I/O to the secondary device OSC_I/O with same polarity (+ to + and - to -), and tertiary is selected with the inverse polarity (+ to - and - to +).