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Part Number: LMH1983
I've designed in the LMH1983 + LMH1981 to generate my 148.5MHz for an HD-SDI interface with a GS2972 SemTech device.
Currently I have design in the CTS 27MHz VCXO recommended in the datasheet/app note, but it's very large and would like to source a smaller alternative. I'm considering an Epson VG-4231CE 27MHz stability 37ppm APR 100ppm and I beleive the Jitter is 50ps maximum. It's onlys 3.2x2.5mm. Is this part suitable?
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Can you please request & provide the phase noise data from 1 or 10 Hz up to 1 MHz for the VCXO part number you're considering to use?
In reply to Alan O:
currently looking most promising is this part
-80 dBc/Hz at 10 Hz
-110 dBc/Hz at 100 H
-135 dBc/Hz at 1 kHz
-140 dBc/Hz at 10 kHz
-145 dBc/Hz at 100 kHz
still awaiting answer from another supplier also.
In reply to Paul Carson1:
Epson have come back with what I hope is enough data....
The planned part number is VG-4231CE 27.0000M-PSCM3 as it is x/s.
This means a Stability 37ppm over 40C/+85C and an APR 140ppm (95ppm min).
Vdd = 3.3v; Vc = 1.65v; 40/60 symmetry;
GEYER have come back with a reponse:
Stability 50ppm over -40/+85C and APR 80ppm.
Max Phase jitter 1ps
@ 10Hz -80 -60@ 100Hz -110 -90 @1kHz -135 -112@10kHz -140 -130 @100kHz -145 -150@1MHz -150 -150 (> 100Khz)
The Geyer 100kHz doesn't look just as good as CTS 357 series , but much better at lower frequencies so would it be good enough?
CTS Model 357 008-0244-0_H.pdf27,000MHz KXO-72R VCXO - 3.3v 50ppm -40+85deg C.PDFThanks,
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