Now taking pre-orders for 5MHz smd crystals, need to reach 1k units
tonyp12
Posts: 1,951
Place your interest for: (it will be one of these two contenders)
8mm x 4.5mm http://www.ecsxtal.com/store/pdf/csm-9.pdf
7mm x 5mm http://www.jauchusa.com/ablage/med_00000840_1351261712_JXG75P2-040512.pdf
20 units at $0.90 each
100 units at $0.80 each
Shipping adds $2 (international same for 20units, $4 for 100units)
This is a special order and will take 2 months
Saves a lot of board space, look how far the pads for HC49 goes sideways.
8mm x 4.5mm http://www.ecsxtal.com/store/pdf/csm-9.pdf
7mm x 5mm http://www.jauchusa.com/ablage/med_00000840_1351261712_JXG75P2-040512.pdf
20 units at $0.90 each
100 units at $0.80 each
Shipping adds $2 (international same for 20units, $4 for 100units)
This is a special order and will take 2 months
Saves a lot of board space, look how far the pads for HC49 goes sideways.
Comments
Q 5,0-JXG75P2-20-30/50-T1-LF
which is 20pF load, 30ppm/50ppm, -40/+85 °C.
The reel was special order and cost $650. Buying for production, or for hobby? I have about 200 on hand if you need a few.
That may not be the current price. It was a couple of years ago. I'll check.
Now if we only could find a 6mm x 4mm contender @ 20pf and 5Mhz
the part as it was requested by Tony is a custom item, so our records show the price and this is the price for a custom item like this.
6x4mm parts are not that common anymore, so finding one would be very hard. The other thing is the frequency. The lower the frequency, the bigger the Crystal blank, so you can only do certain frequencies in certain sizes.
If you are concerned about the size, why not go with an Oscillator right away? http://jauchusa.com/cms/us/frequency_control_technology/oscillators/
This would solve the problems of building your own circuit and you would have the requested size.
If there is anything else you need, do not hesitate to contact us.
Thanks
Jauch Quartz America, Inc.
How about 2.5 x 2mm at 55c/1k ?
The Silabs Si501 series are factory programmable Osc, so you ask for MHz as a 32 bit floating point number.
An alternative approach is to use tiny Microcontrollers, ~ 3mm x 3mm package size, that have Xtal Osc and CLKOUT options.
In the simplest use, they are pgmd as merely Oscillator/Dividers.
Candidates seem to be 50~60c from Microchip (MSOP8) or SiLabs (QFN20,SO16)
and some have ADC, so they could add some peripheral smarts to a Prop system almost 'for free'.
Most small uC have 1-2% Osc, which can make the Xtal optional
You need to give it gnd and Vdd and connect clk to Xin.
They don't create jitter that is bad for VGA?
Would you have to change the clk-settings in the demo from crystal to a clk?
As the idea is that Example Demos work as they are.
Jitter should be ok for VGA - the Si504 I tested here has sub ppm slow drift, very like a crystal.
If you order a Si501 for 5.000MHz, then all examples 'should just work'.
Silabs also do a Si502, which has Dual-Choice, so there 5.000MHz & 6.000MHz would make Prop-sense
Incidentally, The Jauch MOQ was 1k, and less than that would have cost much more. Other manufacturers I contacted at the time could not supply a 5MHz rock in the 7x5 footprint.
http://www.digikey.com/product-detail/en/NX8045GB-5MHZ-STD-CSF-3/644-1202-1-ND/3894081
I have used these on my "mimsmirror" designs for many months now.
http://forums.parallax.com/showthread.php/154191-MimsMirrorZero-and-MimsMirrorOne-(it-blinks-rgb)
Yeah, I know, go figure, but I just use 10MHz in all my commercial designs anyway and these ones are smaller at 5x3mm and only cost 68 cents even 1 off. Better hurry though, DIgikey only have 13,000 of them left.
>http://www.digikey.com/product-detail/en/NX8045GB-5MHZ-STD-CSF-3/644-1202-1-ND/3894081
How are you dealing with 8pF vs the 20pF the Prop needs?
As having something run 5% slower is not acceptable.
The 10MHz rock from all I've heard works fine, but it is outside the official Parallax 4 to 8 MHz range for the PLL. Is it okay over the full temperature range? By design, yes, but the Prop data sheet has only a graph of PLL current vs frequency up to 160MHz at 25°C.
For lower IQ I like to have the 5MHz option.
But I do agree that not only are HC49 cans big but that the SMD fudge that was imposed on them by spreading their dipole antenna leads out past the can are more of a concern for routing and EMI sensitivity than going to 10MHz. Crystal oscillator layouts need to be kept tight but many I have seen do give me a fright.
That may be true, but I'm sure I'm not the only one making things for harsher environments. There are weather stations, high altitude balloons and probably more than a few being set up in the automotive environment. Recently I've been running at 3.0V in order to get fuller use out of a single lithium cell with linear regulator. The PLL at 80MHz draws half what it does at 160MHz. I'm conservative about it--It is in fact the extended temperature, lower voltage, and the need to minimize power.
-Phil