I have ever seen so many parallel dac in family of TDA ie., TDA1543,TDA1387 and TDA1541 ,but I never seen TDA1545 in parallel. I have done with single of TDA1545 dac ,I am so prefer the sound than single TDA1387.I have plan to do parallel TDA1545 dac but I confuse about Vref pin (pin7) that should be connect to parallel or individual float .Could you please recommend about parallel solution?
I'd float pin7 when paralleling if I were you. I parallel plenty TDA1387 and always float pin7. I modified a Lite DAC-AH a few years ago with 32 paralleled TDA1545s.
DACalito - transversal modification of DAC-AH Lite - diyAudio
DACalito - transversal modification of DAC-AH Lite - diyAudio
Thank you very much Abraxalito .May I ask you more question .
1.What is the resistance value of the resistor that connect to pin 7 (I have seen value 513 that mean 51 K or 513 ohm)of each stack and why connect only the 1st TDA1545 of each stack ?
2. What is the i/v stage that you apply for this DAC ?
1.What is the resistance value of the resistor that connect to pin 7 (I have seen value 513 that mean 51 K or 513 ohm)of each stack and why connect only the 1st TDA1545 of each stack ?
2. What is the i/v stage that you apply for this DAC ?
The resistor value you use depends on what output current you want. Normally its ~55k according to the DS, split into two to decouple supply noise. I think best to use such an arrangement on each DAC, don't parallel pin7s.
The I/V stage I used on this DAC was a resistor. Then a post-amplifier (AD605) which I wouldn't use nowadays as its too noisy.
The I/V stage I used on this DAC was a resistor. Then a post-amplifier (AD605) which I wouldn't use nowadays as its too noisy.