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Pushing the limits of TDA1543 NOS DAC

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#322
abraxalito said:
If you refer to the datasheet (fig5, format of input signals) you'll see that everything is 'seen' by the chip only when there's a clock edge. So only when a clock rising edge follows the WS falling edge is the current sample converted. In fact there's a delay of a clock cycle after that edge before all the serial data has been received so its impossible for the DAC to convert a sample on the WS transition.
Click to expand...

Hello, may I ask one more thing:
Using a 2.8224Mhz clock connected to the dac achieves low jitter and can easily translate to 44.1Khz by means of a 74HC4040 clock divider.
But should I need 22.5792Mhz on another part of the circuit what IC can I use to multiply the clock?
( The specific case is an sd card reader that I want to slave that uses the 22.5792Mhz)
Thanks 🙂
 
#323
Whilst clock multiplication is possible - you'd use something like a 74HC4046 or HC7046, I'd not recommend it. Rather use a 22.5792MHz oscillator and divide it down to the frequencies you need. Use a synchronous counter rather than a ripple counter for lowest jitter. Note the HC4040 is a ripple counter so you'd best not use it to create any clock that needs to be lowest jitter.
 
#324
abraxalito said:
Whilst clock multiplication is possible - you'd use something like a 74HC4046 or HC7046, I'd not recommend it. Rather use a 22.5792MHz oscillator and divide it down to the frequencies you need. Use a synchronous counter rather than a ripple counter for lowest jitter. Note the HC4040 is a ripple counter so you'd best not use it to create any clock that needs to be lowest jitter.
Click to expand...

I was wondering how well a ripple counter and jitter go along...you have answered that...!
22.5792Mhz ÷ 44.1Khz = 512 = 2^9
That would make it a 10 bit synchronous counter, any IC you could suggest ?
Thanks B.
 
#325
Do you really need all frequencies down to 44k1 to be lowest jitter? If feeding into a TDA1543 only the BCK needs to be low jitter. So how about a 4 bit synchronous counter (you only need to divide by 8 to get BCK) and the rest can be handled by the HC4040?
 
#331
Many still have them in stock. I have them in stock. In fact I will be selling my complete BG stock.

* Just an anecdote: I designed a DAC with another member here. Many were built and I only built one with exclusively BG NX HiQ (in several values). This DAC was given away as a present. I recently listened to this DAC and was blown away by the difference in sound quality. The best sounding of the many versions I built.
 
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#332
Strange if many have them in stock, as I have been trying to locate a supplier, but no result so far.
It would be nice to have an alternative that is currently in production. The BG vintage prices are completely insane on ebay.
 
#333
How many do you need ? Without reading this complete thread I can tell I use solid aluminium caps as an alternative but those are out of production too. Easier to find though. I also stock these ;-)

There are not many alternatives except the obvious attempts to sell stuff that is supposedly just as good (for the wallet of the seller).
 
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#334
I do not have an exact number just now. But I would still prefer an alternative that was currently in production. What about Acrylic SMD capacitors like the ones recommended by ec-designs as decoupling for the TDA1541? Has anyone tried these as replacement for the non polarized 0,1 uF BG nx types? You got PM
 
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