Generally the switching frequency for analog-input devices in TI's TAS56xx family (TAS5611, TAS5613, TAS5615, TAS5630) is controlled by a single resistor.  It is also possible to use an external clock.

Each device includes a master clock oscillator, and its frequency can be trimmed with a resistor at the FREQ_ADJ pin.  The trim resistances and switching frequencies are shown under RECOMMENDED OPERATING CONDITIONS.  The master clock rate is 10 times the switching frequency.  To use an external clock, connect the FREQ_ADJ pin to VREG and drive OSC_IO+/- differentially with the external clock.