You need 2 oscillators, one at 22 MHz and the second at 24MHz. There are 3 types of oscillators: Clapp, Driscoll and Pierce, the Driscoll only works with SC-Cut crystals. Then you need the daughter board to supply the oscillator boards.
The problem is that a pair of Sc-Cut or AT-Cut crystals at 22/24 MHz is no longer available. There are in stock 22Mhz AT-cut and 24 MHz SC-cut.
So the only option is: 1 x TWTMC-D Driscoll oscilaltor board for the 22 MHz AT-cut Crystal, 1 X TWTMC_D oscillator board for the 24MHz SC-Cut Crystal, 1 x TWTMC-D&D daugther board to supply the oscillators (and obviously the 2 crystals above).
You could get bare boards or finished boards.
Best crystals you can get
I would suggest to keep in the right consideration a pair of crystals that could reach the best phase noise performance, since they have a Q around 2M.
These are SC-Cut crystals 3rd overtone from Laptech in cold welded HC-47/U package at 5.6448 MHz and 6.144 MHz:
ESR: around 125 ohm
C0: 3 pf
C1: 0.15fF
Q: around 2M
The MOQ is 15 pcs for each frequency.
If you don't need high sample rate this is the best option to get very low phase noise.
The discrete DAC I'm working on will operate the best with such low clock frequencies (5.6448 and 6.144 MHz).
Attached the new order form that includes the above crystals.
I would suggest to keep in the right consideration a pair of crystals that could reach the best phase noise performance, since they have a Q around 2M.
These are SC-Cut crystals 3rd overtone from Laptech in cold welded HC-47/U package at 5.6448 MHz and 6.144 MHz:
ESR: around 125 ohm
C0: 3 pf
C1: 0.15fF
Q: around 2M
The MOQ is 15 pcs for each frequency.
If you don't need high sample rate this is the best option to get very low phase noise.
The discrete DAC I'm working on will operate the best with such low clock frequencies (5.6448 and 6.144 MHz).
Attached the new order form that includes the above crystals.
SC-Cut 3rd overtone 5.6448 and 6.144 MHz interest list
- andrea_mori: 3 x SC-Cut 5.6448 MHz + 3 x SC-Cut 6.144 MHz
- andrea_mori: 3 x SC-Cut 5.6448 MHz + 3 x SC-Cut 6.144 MHz
SC-Cut 3rd overtone 5.6448 and 6.144 MHz interest list
- andrea_mori: 3 x SC-Cut 5.6448 MHz + 3 x SC-Cut 6.144 MHz
- fralippo: 2 x SC-Cut 5.6448 MHz + 2 x SC-Cut 6.144 MHz
- andrea_mori: 3 x SC-Cut 5.6448 MHz + 3 x SC-Cut 6.144 MHz
- fralippo: 2 x SC-Cut 5.6448 MHz + 2 x SC-Cut 6.144 MHz
Andrea you have an idea what is the difference in phase noise levels between crystal at 5-6 MHz against 11-12 MHz against 22-24 MHz ect.....
Theoretically at least 6 dB every time you divide by 2.
Practically I believe 5-6 MHz SC-Cut will perform much better, since the unloaded Q is closed to the highest you can get from a Crystal.
- andrea_mori: 3 x SC-Cut 5.6448 MHz + 3 x SC-Cut 6.144 MHz
- fralippo: 2 x SC-Cut 5.6448 MHz + 2 x SC-Cut 6.144 MHz
- gentlevoice: 1* SC-cut 6.144 MHz
- fralippo: 2 x SC-Cut 5.6448 MHz + 2 x SC-Cut 6.144 MHz
- gentlevoice: 1* SC-cut 6.144 MHz
- andrea_mori: 3 x SC-Cut 5.6448 MHz + 3 x SC-Cut 6.144 MHz
- fralippo: 2 x SC-Cut 5.6448 MHz + 2 x SC-Cut 6.144 MHz
- gentlevoice: 1* SC-cut 6.144 MHz
- gabor80: 1 x SC-Cut 5.6448 MHz
- fralippo: 2 x SC-Cut 5.6448 MHz + 2 x SC-Cut 6.144 MHz
- gentlevoice: 1* SC-cut 6.144 MHz
- gabor80: 1 x SC-Cut 5.6448 MHz
- andrea_mori: 3 x SC-Cut 5.6448 MHz + 3 x SC-Cut 6.144 MHz
- fralippo: 2 x SC-Cut 5.6448 MHz + 2 x SC-Cut 6.144 MHz
- gentlevoice: 1* SC-cut 6.144 MHz
- gabor80: 1 x SC-Cut 5.6448 MHz
- lindamar: 1 x SC-Cut 5.6448 MHz
- fralippo: 2 x SC-Cut 5.6448 MHz + 2 x SC-Cut 6.144 MHz
- gentlevoice: 1* SC-cut 6.144 MHz
- gabor80: 1 x SC-Cut 5.6448 MHz
- lindamar: 1 x SC-Cut 5.6448 MHz
At the moment this is only an interest list, we have to meet the MOQ to place the order to Laptech: 15 pcs for each frequency (5/6 MHz).
So I can delete the 49MHz Sc-cut Crystal (in stock at Laptech) from your order, but I cannot guarantee you will get the 6.144 MHz until we will reach the MOQ.
Please, let me know.
Ok, your order has been deleted.
Please, add yourself to the interest list for SC 6.144MHz.