We have got HMC8191. When we apply LO signal to 23 pin we have no response in the IF outputs. So we tried to send a 12 Hz 15 dBm signal to various inputs.When we apply LO signal to 24 pin we have some response in the IF outputs.But when we smoothly reduce amplitude of signal at 24 pin, amplitude of output signal (pin 10 and 12) decreases smoothly too. At the same time if amplitude of signal at 16 pin, becomes below a certain level the output signal falls sharply. It seems that 24 pin reveal itself more as RF input then LO. And the behavior of 16 pin looks like LO input then RF.
Is it correct behavior of HMC8191? What can be wrong?
What is the correct pin configuration and function of HMC8191?
I replied to this via email to the FAE as well. I'm posting the response here as well.
The pin configuration shown in the datasheet is correct therefore the behavior described is indeed odd . The behavior described does seem like the LO input is pin 16 and the RF port is pin 24, which is not correct.
Could you send a picture of the part with branding on top of the package? I want to make sure you have received the correct part. Also, just curious, how are you testing each pin? It would be useful to see a setup diagram.
We tested the chip by connecting two generators to the LO and RF and changing the power in manual mode on each pin. We watch the signal on the output with an oscilloscope