How the special PECL of ADCMP582 connect with standard PECL receiver parts?

Hello,

The output of the LVPECL driver is higher than the LVPECL receiver because the cable and the termination between them will form a voltage divider circuit (inside the orange box).
For example, let's say VCCO=3.3V and VTT=1.3V. To have the input at the receiver = 1.7V, the output of the driver should be = 2.1V.


As for the low level, the expected voltage at the input will be 1.635V (worst-case is 1.55V to 1.70V).

Best Regards,
Sham

Hello Sham,

Sorry, I can't see the picture you uploaded. Can you upload it again?

Oh sorry,

It is just Figure 22 from the datasheet .

Hi Sham, if this is the case. I still can't understand you. You know, we design according to the datasheet. But MC100EP01 doesn't output normal signals. MC100EP01's output keeps high level. It means that MC100EP01 can recognize high level, but it can't recognize the low level. Just as below figure shows:

So how to make receiver to accept ADCMP582's output signal? That's our original question. I don't know how the cable and termination to convert ADCMP582's output? You know, we use same configuration between MAX9601 and MC100EP01. MC100EP01 can accept signal from MAX9601, because MAX9601's output signal level fit MC100EP01's input Sepc.

Hello,

Another thing, ADCMP582 operates with RSPECL or Reduced Swing PECL wherein the swing is 400mV as described in the General Description of the datasheet.
Please confirm if MC100EP01 can recieve RSPECL.

 Thanks,
Sham

Hi Sham,

MC100EP01 defines standard PECL input and output spec. But here our question is that we are discussing how RSPECL can feed (or drive) standard PECL? Otherwise, how ADI promote their products to the customers? You know most applications use standard PECL. How can rsPECL involve to these applications?

I think that this question most like the question how to connect LVPECL with LVDS?!

Hello,

RSPECL can be used for applications at higher speeds since high- and low-level swing shorter.
For normal PECL levels, you may check out the MAX9600/MAX9601/MAX9602 family.

Thank you.