The frequency of MOD_CLK changes with the sample rate, also called FS. The TAx5x1x devices have many defined sample rate frequency bins, with the center frequency of the bin being the expected frequency that would allow the MOD_CLK to be either 3.072MHz or 1.536MHz. The sample rate relates to the MOD_CLK by an integer multiple called the oversampling rate (OSR).

Table 4-3 shows all the possible bins in the device, along with the OSR. The Bin ID is used in register P0_R50 and P0_R51 when specifying the sample rate, with the decimal value of the bin in bits 7-2. These are the same bins used for semi-automatic mode. In manual mode, pay special attention to the OSR associated with each bin. Sample rates can be any value between the minimum and maximum FS shown for each bin, and some frequencies may fall into multiple bins. For these scenarios, choose the bin with the typical value that is closest to the desired sample rate for best performance.

There are two options for the internal MOD_CLK, which affects the oversampling rate of the delta-sigma ADC/DAC. More about the considerations of the options is in Section 4.4.