ADAU1966 maximum load current

Question How much current can I draw from the analog outputs? The datasheet does not give values for the maximum recommended currents. Answer We do not specify a maximum amount of AC current that the part can supply, rather we say that the part should be driving no more than a 2 kΩ load from each pin of the differential output to ground, to get best performance. If the load is more difficult to drive than 2 kΩ, the part will have increased THD. You can calculate from your max output voltage across this load to get to a max current spec, but remember that the part does not cease to function; the performance will be degraded.

ADAU1966: If using a direct MCLK can I leave LF and PLLVDD pins disconnected?

Question Regarding the PLL of ADAU1966, I intend to use a 48kHz FS with a 24.576MHz master clock. I can provide all the clocks to the ADAU1966. Can I completely disable the internal PLL or do I still need to connect the PLLVDD and LF circuits ? Answer As you are providing a direct MCLK, the Loop Filter components are not required so you do not need them. The PLLVDD however, involves interfacing inside the part to other areas. I have asked the designers about this and they have confirmed that the PLVDD is related to the direct clocking of the part by MCLK and so you do need to apply power to the PLVDD pin at all times.

How to connect unused SDATA inputs on ADAU1966?

Question How should I connect unused SDATA inputs on ADAU1966? Answer You should treat SDATA inputs on ADAU1966 the same as any unused logic/digital inputs, we recommend tying them to GND.