Is the schematic correct ? the two outputs are connected and the two inputs
Where do I find the other end of "FILTER OUT" ?
Yes, they are pin and software compatible.
The ADAU1452 was produced first and so the ADAU1466 was designed to be compatible with the 1452. So any 1452 program will run with no changes and…
The user guide I am talking adout of the ADAU1466 . Page 33 and 34 dose not show where in the circuit OP_AMP_REF1 and OP_AMP_REF2 where in the circut the other ends are connected to as shown on page 47 EVAL…
U6-A, U6-B, and UC-6 are the same dual opamp IC. That circuit is generating a 2.5V reference voltage, likely used to bias the ADC's input.
FILTR is the capacitor connection for the AD1936's internal voltage reference. See the datasheet for that part.
There is a lot of vagueness in this post. What are the schematics from?
After doing some looking I see it is from the EVAL-ADAU1452REVB
The outputs of U6 net names pretty much describe what they are used for. For the ADC buffer op amp reference.
The FILTR output of the AD1938 is used only internally. It comes out on a pin so large bypass capacitors can filter this reference voltage. It is not and should not be used for anything else. If the internal Common Mode (CM ) voltage is desired for direct coupling the DAC output filters then the CM pin, pin 38, can be used but it is recommended to buffer it using a voltage follower.