TXC Oscillator

[sameerdhiman]

Hi,

Are Txccrytal (TXC Crystals and Oscillators) TA series is good for Audio ADC and DAC projects?

 

[Hugh Jazz]

Probably no. It is for computer and no phase noise in datasheet.

http://www.txccrystal.com/images/pdf/ta.pdf

 

[sameerdhiman]

Umm..OK

 

[jcx]

well another consideration is the actual published double blind thresholds for audibly detecting jitter/clock phase noise - basically no quartz crystal oscillator made will have 100 ns jitter
so just about any quartz oscillator of the right frequency, output levels will be fine for audio

jitter does affect the output noise specs - DSD, single bit DACs are the most sensitive, full bit depth ladder DACs the least sensitive

the Temp Comp of the frequency really doesn't do anything needed in audio playback either - pitch perception is also much worse than common xtal osc full temp range dF - without added compensation circuitry

 

[sameerdhiman]

Hi JCX,

What I understood from the text (Please correct me if I am wrong) that TXC TA series will do the job

My Application:
AKM AK5394A based ADC for Audio THD measurements.

 

[zjaakco]

Hi sameerdhiman

Go to the " discrete low jitter clock GB'' of amc184.
in the groupsbuy thread.

 

[jcx]

if a TXC oscillator is what you have, it will work to a very high degree - but the others are correct in that there are lower phase noise/jitter xtal osc, TXC as a class aren't the very best as audio measurement standards


but if you clock both ADC and DAC of your audio test system from the same osc the low frequency, close in phase noise/jitter effects on the measurements are hugely reduced

 

[sameerdhiman]

Hi JCX,

Here in India I am totally dependent on in.element14.com stock. It would be great help if you can suggest crystal from their current stock.

 

[sameerdhiman]

I short listed few of them. Please suggest which one would be suitable

MODEL # MFG JITTER Tr/Tf
=========================================================
24.576MHZ XO91050UITA EUROQUARTZ < 1ps (typ) 4ns (max)
7W-24.576MBA-T TXC 1ps (max) 7ns
7W-24.576MBB-T TXC
7X-24.576MBB-T TXC 1ps (max) 10ns
FXO-HC536R-24.576 FOX ELECTRONICS < 1.1ps (typ) 3ns
FXO-HC736R-24.576 FOX ELECTRONICS

 

[Hugh Jazz]

i use xo91 and fox xpresso before. Both are suitable for audio. I prefer xo91 but difference is smal.

 

[sameerdhiman]

Thank you so much 🙂