LMK1D1212EVM: LMK1D1212EVM:

Hi Tim, 
Refer to this list for our LVTTL capable buffers. 
Clock buffers product selection | TI.com

We also have LMK1C which is an LVCMOS buffer family. 

Best regards, 

Vicente 

Hi Vicente, thanks for your reply. My application is to distribute single ended LVTTL clock to x9 min O/P's via SMA Edge connectors. The I/P I have is single ended, but the O/P I need is Differential. The I/P I have control over so can be LVDS etc. So if there is a conversion IC which will O/P LVTTL Differential signal then that is good. DC I/P 3.3V and upto Freq 100 MHz is OK. I was hoping that you could recommend a similar Eval board to the LMK1D1212 low jitter 2:12 LVDS fan-out buffer evaluation module, with the appropriate spec chip mounted that I could just purchase of the shelf? Is there anything that you could advise?

Hello Tim, 
LVTTL is equivalent to LVCMOS. 
Sounds like you have a 3.3V LVCMOS input and you want 12 LVDS outputs. 

LMK1D1212 is an option. 

The device can accept a SE swing up to 3.465V which meets 3.3V LVCMOS levels. 

You can purchase the LMKD1D1212EVM. 

You will just need to rework the EVM to allow an LVCMOS (SE) input. 

Best regards, 

Vicente 

Hi Vicente,

I already have the above, I need to supply LVTTL Differential signal to in x9 O/P's via SMA connectors. Is there an IC that is mounted on an evaluation board that TI can supply off the shelf?

Hi Tim, 
LMK1D1212EVM can do this by not by default. 
You need to rework the board to allow for SE input. 

LVTTL is not a differential signal type from my understanding - it is SE signal with logic levels the same as LVCMOS. 

If my understanding is incorrect, please upload a block diagram/clock tree of what you're trying to implement. 

Best regards, 

Vicente 

Hi Vicente.

Thanks for your reply. I have set up the LMK1D1212EVM for single ended I/P. That is all good. I just need to convert my LVDS signal O/P to a LVTTL Format . So for a single CH I have Differential LVDS O/P's P & N. I have to go from this to LVTTL, so x1 side the P side convert to LVTTL, then the N side needs to be LVTTL, but if this can only be LVTTL O/P as single ended normal LVTTL, then I have to Invert also. So I end up with P side for LVTTL & an Inverted LVTTL. This i can then pass onto the nxt stage. Any Ideas of an IC combination that can do this?

Hi Tim, if you required the LMK1D1212 output which is LVDS and now wish to convert this back to LVCMOS, I don't see a point in needing to use LMK1D1212 to begin with. 
The input to LMK1D1212 is SE according to my understanding. 

Tim Claydon said:

The I/P I have is single ended, but the O/P I need is Differential.

But regardless, you cannot convert an LVDS signal to an LVTTL signal without going through a dedicated IC first. 
We don't have a device like this. 
We have devices that can output LVCMOS such as LMK04832 where you can output both _P &N either in phase or out of phase. 
From this point. 
If the input is SE maybe going through LMK04832 and having the outputs 180deg out of phase is an option. This would be two LVCMOS signals that are basically differential which seems like just you want. 

As an example: 

We can operate in buffer mode and set the clock output format to CMOS (Norm/Inv). 
In this setup the _P pin will be 180deg out of phase relative to the _N pin. 

The input to this device can be SE and the output is now basically a differential LVCMOS signal which is equivalent to differential LVTTL from my understanding. 

Best regards, 

Vicente 

Hi Vicente,

Thanks for all the info. Maybe I should mention that I need to distribute a single ended I/P to x9 P & N O/P's, so I was using the LMK1D1212 to do this. I like your suggestion using LMK04832, but I would need an EVAL board made up, which will give me x9 O/P channels, so I would need x9 LMK04832 IC's, and some sort of clock Splitter arrangement as I only have x1 single ended I/P at my disposal. All powered of a 3.3v supply. Any thoughts as an off the shelf solution. Looking like its going to bespoke design.

Tim

Hi Vicente,

I have seen the LMK04832 Eval Board also, which is probably what I am looking for but could not see any physical dimensions in the spec sheet or user guide. Any Ideas? I think it might be too late for what I am doing now however I think we will purchase x2 of these, but waiting for a colleague to have a look also.

Hi Tim,
Refer to thread below.
(+) LMK04832EVM: Dimensions - Clock & timing forum - Clock & timing - TI E2E support forums

Best regards,

Vicente