SparkFun Clock Generator 5P49V60 - LVDS Mode not working, and no 1 MHz frequency output possible

Qwiic System
1

Has anyone had any experience with this clock generator chip?

I am having two big issues with it.

  1. I cannot program LVDS mode.

Using a 3.3V supply, the LVDS signal is supposed have a common mode voltage of about 1.2V or so. With an amplitude of maybe 300mV pk-pk.

Instead I see a signal with an amplitude of about 2.5V pk-pk and with no 1.2V common mode voltage.

Attached is a signal with the (LVDS_MODE).

  1. Anytime I try to program an ouput of 1 MHz, I see 25 MHz.

And I am using only the basic example code from the examples.

clockGen.clockOneConfigMode(LVDS_MODE);

Serial.println(“Setting Clock One Frequency to 1MHz.”);

clockGen.setClockOneFreq(1.0); // Give float value in MHz, 1.0 = 1000000Hz or 1MHz

// --------------------------------------------------------------

}

void loop(){

delay(1000);

}

tek00074.png
tek00074.png1024×768 14.5 KB

2

We haven’t seen this before - the datasheet mentions perhaps contacting IDT if using non-default terminations to ensure compatibility (https://cdn.sparkfun.com/assets/d/a/9/7 … _Clock.pdf)

If you end up determining that it is defective, head over to Return Policy - SparkFun Electronics and we’ll get you squared away