Tool/software:
Dear Team,
Kindly share the electrical characteristics(Voh,Vol,Vih and Vil) of the LVDS Clock output (RFout) of the part LMK04832-SP.
Regards,
Mithuna Krishnakumar
This is standard LVDS which means if the common mode is 1.25V typical VOH is VCM + 400mV / 2 = 1.425V & VOL is VCM - 400mV / 2 = 1.05V
These are typical values of course.
Best regards,
Vicente
Dear Vincent,
I just entered the wrong part number. Sorry for the inconvenience.
Kindly share the details for the part number LMX2615-SP.
Regards,
Mithuna
Hello Mithuna,
LMX2615-SP is a RF synthesizer with open collector outputs.
The output is CML format not LVDS.
This device has adjustable output power controlled via SPI.
The DS mentions typical RF power.
Open collectors require a pull up to Vcc (if not integrated internally) - in this case it's not and thus external PU is required.
A 1nH PU inductor can be used to gain more RF power at the cost of impedance matching.
The common mode voltage for open collector CML outputs is usually a bit above 2V.
Best regards,
Vicente
Dear Vicente,
Thanks for your reply.
With reference to trailing query,What is the Minimum guaranteed Output power at 12GHz ?In datasheet the typical value Output powerat 15 GHz is 4 dBm
It will be useful for us to measure the Insertion loss for our Trace in PCB.
Best regards,
Venkatraj V
Venkat,
As mentioned,
Output power is adjustable via SPI.
At high frequency - PCB layout also has an effect and longer traces can lead to reduce output power.
Best regards,
Using OUTx_PWR = 31 @12GHz you can expect around 7.5dBM with a resistive pull up or around 12.5dBm with an inductor PU.
Vicente
Dear Vicente,
Thanks for your reply.
I understand your point that we can adjust the power using the SPI. But as per the below details given in the datasheet ,with same 50 ohms pull up and OUTx_PWR = 31 for 15Ghz, output power is given as 4dBm with de-embedding the microstrip trace losses.
As per the above Graph,for the same conditions the output power for 15Ghz is around 7.5dBm.
The changes in power Data make us confused.So kindly clarify the Minimum guaranteed Output power at 15GHz.