Tool/software:

Hi everyone,

I am working with two LMX2820 PLLs that share common SPI lines, with only the chip select (CS) differentiating between PLL1 and PLL2. I am facing an issue where I am unable to generate different output…

Tool/software:

Your spec. is 45MHz到22.6GHz....But I can't set RFOUT to 1 GHz from TICS PRO

How should I set on internal VCO? Or it's lowest at 5.65GHz ?

Tool/software:

I am testing the LMX2820 eval board and am noticing that when I measure the high-end frequencies, about 22.5 GHz) I am only measuring -5dBm on the output. However, the datasheet…

Tool/software:

Question: what is the LMX2820 output jitter degradation if I have a rather low pfd frequency such as 10_MHz?

For contrasting examples, the two examples below have similar VCO…

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Hi,

Recently I've designed a custom PCB containing 3 LMX2820 ICs, in order to simultaneously generate 3 output frequencies: 325, 650 and 1300 MHz. The reference signal (162…

Tool/software:

Higher frequency resolution device.

I study the frequency resolution of LMX2485 but it is not enough to achieve my project.

Requirement is 36bit minimum.

Tool/software:

Dear Specialists,

My customer is evaluating LMX2820 and LMX1204.

They have a question about SYSREF of LMX2820.

I would be grateful if you could advise.

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We have questions…

Tool/software:

Hi,

According to the schematic of LMX2820, CPOUT and VTUNE require three capacitors: 68nF, 2.2nF, and 480pF. However, we currently lack the 68nF and 2.2nF capacitors. Can we use capacitors with other values as substitutes…

Tool/software:

Hi Noel,
 I hv used LMX2820 for 18.5GHz frequency generation, I am observing 18.5GHz is going out of lock over the period .

Among 50ICs assembled 23 ICs are having this issue Plz suggest some solution Here I am attaching…

Tool/software:

Hi,

In the datasheet for LMX2820 there is a specification for the dynamic range and speed of the MUTE function (using the external pin), i.e. Pmute, tMute, tUnmute.

Similar to the mute function I'm interested in switching…

Tool/software:

We are using LMX2820 to generate 18.5 GHz signal. In the output we are seeing some random spurs with a span of 2 MHz and the spurs are not uniform and it keeps on changing for every sweep. I have attached two three…

Tool/software:

When I use Instant Calibration to output a frequency of 5.65 GHz for the first time, it outputs 5.6 GHz instead, and the LMX2820 fails to lock when set to output 5.65 GHz.

Additionally, when using Instant Calibration…

Tool/software:

HI!

After the LMX2820 instant calibration initialization, the frequency was changed from 5.65GHz to 10GHz. The LD lock time is 6 seconds. Procedure
Without power off, 10GHz lock off after even calibration:
R1:0X57A0

Tool/software:

Hi,

I would like to generate single ended CMOS clocks (< 250 MHz) with 10%, 25%, 50% and 75% duty cycle on the board. …

Tool/software:

Hi, i'm Programming LMX2820 EVM.

I want to use Instant calibration to achieve instant PLL control.

Problems occur when controlling the range of 12.5 GHz to 22.6 GHz in…

Tool/software:

Hi, I'm using this PLL for my design but I need to testing it at hot temperature.

Reading from the temperature sensor internally,  at around 130C, I see the OSC pins bias start to jump around. And PLL unlock since…

Tool/software:

Hi team,

i'm using the evaluation board of the PLL LMX2820 to generate an output frequency of 22.4 GHz.

The reference clock is a sinewave 100 MHz (from en external OCXO…

Tool/software:

Hi,

I need to implement a reliable and fast-hopping wideband synthesizer using LMX2820. I just want to confirm that the following two posts cover all known LMX2820 issues, particularly in relation to instant calibration…

Tool/software:

Many PLL devices which have an internal OSCIN doubler advice not to use higher fIN for better phase noise performance. How does this apply to the LMX2820 ?

Tool/software:

Hi,

Does the LMX2820 support some sort of SPI block writing of contiguous registers? I'm looking at calculating how long time it will take to do the SPI transacations to change frequency with instant calibration.…

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hi,

if anyone is interested in a linux driver for the lmx2820 evaluation module, I have a working driver.

The code was derived from this: https://forums.raspberrypi.com/viewtopic.php?t=319702,

I added the missing pieces…

Tool/software:

Hi,

 I have some problems in phase synchronize multiple LMX2820 devices.I use an external sync signal to synchronize two LMX2820 chips after setting a frequency for each chip. But it seems that synchronization fails…

Tool/software:

I’m looking for some reference code in C or other languages to program the LMX2820 SPI slave mode (CDC or Vendor mode) to initialize the chip and perform read/write.  Thanks in advance!

Tool/software:

I have been using PLLatinum sim to tune the loop filter for the LMX2820 device, and the current configuration I have set up is telling me the loop bandwidth is ~30kHz. My question is: for the loop bandwidth, what is…

Tool/software:

Hi，

As shown in the figure below, when doing instant calibration, does the output frequency of STEP 4 have to be 5.65GHz? 
Is 18.4GHz okay?

Thanks！