Other Parts Discussed in Thread: TPA3128D2, , OPA333
Hi,
I have attached a schematic for my design of a sound system using the PCM1770 and TPA3128D2. The OpAmps circuit you see in the schematic is a Single Supply Single-Ended Input to Differential Output.
Questions:
1) I am using a single speaker for this setup. Is this the correct way to set up the DAC to have monaural output? From the datasheet: "The monaural output can be created by summing the left and right headphone outputs." I am assuming the HoutL and HoutR negatives are both grounded internally together. Additionally is the size of the "summing" resistors I am using correct? I have seen people recommending various sizes up to 10k ohms.
2) In the typical application in the TPA3128D2 datasheet it seems there is separate power decoupling for pins 31/32 and pins 17/18/19 (as is also shown in my schematic). Is this necessary, or can I combine these two power rails and just use 3 capacitors instead of 6 (for design simplification purposes).
3) Does the rest of my schematic look correct? Particularly how I interfaced all of my components together.
Thankssound-Sound.pdf
