Package received too, thanks Andrea!
By the way, there is a temperature marked on the crystals (44/49 SC cut )
80° on one, 83° on the other.
What is it? Optimal operating temperature (in celsius)?
By the way, there is a temperature marked on the crystals (44/49 SC cut )
80° on one, 83° on the other.
What is it? Optimal operating temperature (in celsius)?
You can use two LDOs to supply both oscillators (6V for both oscillators and 3V3 for both squarers).
Nominal temp is 82.5°, so 80° to 83° is fine. In audio in not an issue if there is a little long term drift.
Parts in stock - update
Crystals:
3 x AT 12.288 MHz fundamental
1 x AT 24.576 MHz fundamental
2 x AT 33.8688 MHz 3rd overtone
1 x AT 98.304 MHz 5th overtone
1 x SC 22.5792 MHz 3rd overtone
1 x SC 45.1584 MHz 3rd overtone
1 x SC 49.152 MHz 3rd overtone
4 x SC 90.3168 MHz 3rd overtone
6 x SC 98.304 MHz 3rd overtone
Finished boards:
1 x TWTMC-D finished with AT-Cut 98.304 MHz
1 x TWTMC-P finished without crystal (At-cut 22/24 MHz - AT 24.576 MHz available)
Crystals:
3 x AT 12.288 MHz fundamental
1 x AT 24.576 MHz fundamental
2 x AT 33.8688 MHz 3rd overtone
1 x AT 98.304 MHz 5th overtone
1 x SC 22.5792 MHz 3rd overtone
1 x SC 45.1584 MHz 3rd overtone
1 x SC 49.152 MHz 3rd overtone
4 x SC 90.3168 MHz 3rd overtone
6 x SC 98.304 MHz 3rd overtone
Finished boards:
1 x TWTMC-D finished with AT-Cut 98.304 MHz
1 x TWTMC-P finished without crystal (At-cut 22/24 MHz - AT 24.576 MHz available)
Good morning Andrea, got it as well. Thank you!
Cheers
Ernst
Gesendet von meinem SM-A310F mit Tapatalk
Cheers
Ernst
Gesendet von meinem SM-A310F mit Tapatalk
Parts in stock - update
Crystals:
3 x AT 12.288 MHz fundamental
1 x AT 24.576 MHz fundamental
2 x AT 33.8688 MHz 3rd overtone
1 x SC 45.1584 MHz 3rd overtone
1 x SC 49.152 MHz 3rd overtone
4 x SC 90.3168 MHz 3rd overtone
6 x SC 98.304 MHz 3rd overtone
Finished boards:
1 x TWTMC-D finished with AT-Cut 98.304 MHz
1 x TWTMC-P finished without crystal (At-cut 22/24 MHz - AT 24.576 MHz available)
Crystals:
3 x AT 12.288 MHz fundamental
1 x AT 24.576 MHz fundamental
2 x AT 33.8688 MHz 3rd overtone
1 x SC 45.1584 MHz 3rd overtone
1 x SC 49.152 MHz 3rd overtone
4 x SC 90.3168 MHz 3rd overtone
6 x SC 98.304 MHz 3rd overtone
Finished boards:
1 x TWTMC-D finished with AT-Cut 98.304 MHz
1 x TWTMC-P finished without crystal (At-cut 22/24 MHz - AT 24.576 MHz available)
I'm working on a discrete DAC and I would use the best crystal (reasonably) available.
For the DAC I need only low frequencies oscillator, 44.1 kHz to 192 kHz, so there is no reason to start from crystals at high frequencies dividing down by a large factor.
I don't care about the bit clock, since it comes from an FPGA starting from the local oscillator at 50 MHz. Once the FPGA has fed the shift registers of the DAC it will be stopped, avoiding interference with the word clock.
Since the lower the frequencies of the crystal, the higher its Q and theoretically the lower the phase noise, I would use 5.6448 and 6.144 MHz.
Then I decided to start a new GB to see if we can meet the MOQ for such that crystals at lower frequencies as possible.
In order of preference:
1) SC-Cut 5.6448 and 6.144 MHz
2) SC-Cut 11.2896 and 12.288
3) AT-Cut 5.6448 and 6.144 MHz
For the DAC I need only low frequencies oscillator, 44.1 kHz to 192 kHz, so there is no reason to start from crystals at high frequencies dividing down by a large factor.
I don't care about the bit clock, since it comes from an FPGA starting from the local oscillator at 50 MHz. Once the FPGA has fed the shift registers of the DAC it will be stopped, avoiding interference with the word clock.
Since the lower the frequencies of the crystal, the higher its Q and theoretically the lower the phase noise, I would use 5.6448 and 6.144 MHz.
Then I decided to start a new GB to see if we can meet the MOQ for such that crystals at lower frequencies as possible.
In order of preference:
1) SC-Cut 5.6448 and 6.144 MHz
2) SC-Cut 11.2896 and 12.288
3) AT-Cut 5.6448 and 6.144 MHz
TWTMC GB - IV batch
- andrea_mori: 3 x SC-Cut 5.6448 MHz + 3 x SC-Cut 6.144 MHz + 3 x SC-Cut 11.2896 MHz + 3 x SC-Cut 12.288 MHz + 3 x AT-Cut 5.6448 MHz + 3 x AT-Cut 6.144 MHz
- andrea_mori: 3 x SC-Cut 5.6448 MHz + 3 x SC-Cut 6.144 MHz + 3 x SC-Cut 11.2896 MHz + 3 x SC-Cut 12.288 MHz + 3 x AT-Cut 5.6448 MHz + 3 x AT-Cut 6.144 MHz
I would like to build a clock with 30Mhz. Is this possible?
I could not find a suitable crystal.
I could not find a suitable crystal.
It's possible, but the problem is just the crystal at 30 MHz.
Usually the MOQ for AT-Cut crystal from Laptech is at least 10 pcs for each frequency.
Thank you for your answer. Are there any viable alternatives you would consider appropriate?
Depending on where you are planning to use this oscillator.
The closer frequency is 33.6688 MHz (I have a few in stock), I don't know if it could be suitble.
I try to replace a Connor Winfield CWX813 on a "audiophile" PCI USB card. Without knowing the circuit in detail, I would assume it needs the 30Mhz exact.
I got the parts for 45/49 SC cut Driscoll, and I soldered to the board. But none of board works properly. It jumps between 70-80MHz, but no stabile frequency. What can I do? I try to set the half voltage on C3 but the max is 2,2V instead of 3V at the end of the trimmer turns.