About connecting a TDA1541A to a SRC4192 and a DIR9001

[gaetan8888]

Hello

I would like to connect a TDA1541A to a SRC4192 and a DIR9001

I've done a schematic of it.

I did not include the I/V amp in the schematic but there would be a low pass filter in the I/V amp.

Is my schematic would work ok or do it have any errors ?

Any suggestions ?

Thank you

Bye

Gaetan

[erin]

Looks OK to me mate, what part did you suspect to be wrong?

[gaetan8888]

Hello

I was not sure if I did chose the right output mode for the SRC4192 to go in the TDA1541A .

For power amps I use LTspice, but for digital things, since I have some concentrations problems on small details and drawing, I alway ask guys to check my schematics, in case of errors.

Thank you

Bye

Gaetan

[erin]

I'm not sure if practice deviates from theory with this chip. But you have your reset pin connected directly to +3.3V. You may need to check this.

The datasheet says:

"The SRC4192 and SRC4193 may be reset using the RST
input (pin 13). There is no internal power on reset, so the
user should force a reset sequence after power up in order
to initialize the device. In order to force a reset, the reference
clock input must be active, with an external clock source
supplying a valid reference clock signal (refer to Figure 2).
The user must assert RST low for a minimum of 500
nanoseconds and then bring RST high again to force a reset."

[ThorstenL]

Hi,

Originally Posted by gaetan8888

I was not sure if I did chose the right output mode for the SRC4192 to go in the TDA1541A .

Given that you need a PCB for all these SMD chip's anyay, why not just put a bunch of jumpers (or pairs of config resistors to ground/+Vdd) for all mode and other config pins on all chip's where they make any sense at all. This way you can easily correct any mistakes.

I always do this on my prototype PCB's.

Ciao T

[gaetan8888]

Originally Posted by ThorstenL

Hi,

Given that you need a PCB for all these SMD chip's anyay, why not just put a bunch of jumpers (or pairs of config resistors to ground/+Vdd) for all mode and other config pins on all chip's where they make any sense at all. This way you can easily correct any mistakes.

I always do this on my prototype PCB's.

Ciao T

Hello Thorsten

Hopefully there is only the SRC4192 and a DIR9001 who are SMD. I really don't like SMD parts.

The SRC4192 seem, for me, the only way to use the TDA1541A at 96khz without oversampling, there was a thread about that in the digital-source forum section some time ago.

Thank

Bye

Gaetan

[ThorstenL]

Hi,

Originally Posted by gaetan8888

Hopefully there is only the SRC4192 and a DIR9001 who are SMD. I really don't like SMD parts.

If you do not use 0603 SMD capacitors around these chips you will not get anywhere the performance they are capable of.

Originally Posted by gaetan8888

The SRC4192 seem, for me, the only way to use the TDA1541A at 96khz without oversampling,

The SRC4192 performs asynchronous sample rate conversion.

In principle this is very much the same fundamental process as oversampling, the main difference being that oversampling generally uses integer based math (whole numbers) and is simpler, while up-sampling uses non-integer math (fractions, floating point) and hence is more prone to errors.

So to say that the circuit you show allows the TDA1541 to be used without oversampling at 96KHz is literally true, as in "upsamplig is NOT oversampling", but it is severely misleading if what you want is to operate at 96KHz without digtal filter.

I use my TDA1541 DAC routinely at 96KHz (I have many recordings at that sample rate on my Media PC's harddrive) without a SRC4190 in there, just a CS8414 with a discrete frontend based on Pat "Jocko Homo" DiGiaccomo's SPDIF circuitry directly into the TDA1541 (CS8414 set to output 16 Bit I2S).

I will eventually update the fronend to a WM8805, which is the only receiver worth bothering with in this day and age and can also provide the TDA1541 with 176.4 & 192KHz 16 Bit I2S.

Ciao T

[gaetan8888]

Hello Thorsten

My schematic are just a TDA1541A version of the Micro Dac schematic, that one use a PCM1794A dac chip, but I was presuming that the TDA1541A would sound much better than the PCM1794A. So I've adapted the Micro Dac schematic for a TDA1541A chip.

Here is the original schematic using a PCM1794A dac chip.

Btw, I've seen that the reset of the DIR and SRC chip need a delay of arround 200ms, it need to use a TPS3809K33.

Thank

Bye

Gaetan

[gaetan8888]

Originally Posted by ThorstenL

Hi,

I use my TDA1541 DAC routinely at 96KHz (I have many recordings at that sample rate on my Media PC's harddrive) without a SRC4190 in there, just a CS8414 with a discrete frontend based on Pat "Jocko Homo" DiGiaccomo's SPDIF circuitry directly into the TDA1541 (CS8414 set to output 16 Bit I2S).

I will eventually update the fronend to a WM8805, which is the only receiver worth bothering with in this day and age and can also provide the TDA1541 with 176.4 & 192KHz 16 Bit I2S.

Ciao T

Hello Thorsten

Using the CS8414 at 88khz or 96khz, to have a higher sampling frequency for the TDA1541A, would not work for a 44.1khz SPDIF input signal ?

Thank

Bye

Gaetan

[erin]

Originally Posted by gaetan8888

The SRC4192 seem, for me, the only way to use the TDA1541A at 96khz without oversampling

Gaetan

You can achieve this if you find a stand alone media player or NMT that will output high resolution audio, and then tap the i2s lines from one of these units.

Then you can play 96khz to the TDA1541 as a native format rather than upsampling.