Hi Liu,
Datasheet has the description how to determine the SYNC category and methods to initiate synchronization.
Addition information available in below:
TIDA-01410
training Video
Part Number: LMX2594 Other Parts Discussed in Thread: TIDA-01410 Hi,
we are working on a test PCB, which should have two phase coherent RF outputs of 8.244 GHz using two LMX2594 - so it's simillar to the reference design TIDA-01410.
Here is the difference…
Part Number: LMX2572 Other Parts Discussed in Thread: TIDA-01410 We are using two LMX2572s in integer division. The conditions are classified as category 3 as follows. CHDIV = 4, M = 1, fout/fosc = 910M/80M = 11.375 When the phase sync function was enabled…
Shay,
1. Follow the proper power on sequencing, which says 10 ms after power is applied to let LDOs warm up. Then after this, you don't need the 10 ms and you can program R0. After this, when you toggle R0, it activates VCO calbiration. We have typical…
Hi Denny,
Phase synchronization is possible but since all frequencies are belong to Cat. 3 sync, the timing between the SYNC pulse and the reference clock is critical.
In addition, the max. allowable reference clock frequency in Cat. 3 sync is 100MHz…
Hello Singam,
The doubler is not part of the loop, and should not play a role in the lock time.
0x00251C => programming data 0x251C into register R0. 0x251C = 0010 0101 0001 1100 in binary. You must program D15 = 0, D14 = 0 , D13 = 1, D12 = 0 .…
Hello Moshe,
1. If using only RFoutB, I assume that RFoutA is powered down, R44[6]=0 . In this case RFoutA P, M can be left open.
2. Yes, 50 ohm on each. Please see datasheet section 8.1.4. You can also reference this TI design which shows single…
Francesco,
Here's a plot from our reference design TIDA-01410
I see about 1.2V change in about 200 ps.
1.2V/200ps = 6000 V/us, by my calculations.
Actually twice that if it's differential, as this is a single-ended output.
Regards, …
Ken,
Yes, I was talking about the 50 ohm pullup resistor. I'm not so sure that changing the capacitor will help that much. Theoretically, if you used an inductor instead of a resistor pull-up, that would help.
You might want to look at reference…
