I have some general questions regarding ADAR100 EVALZ:
1. There is a J1 and J2 connector on the board. But there is no description about this connection in the data sheet...
In the data sheet there is only J5 described....and this line is not on the board..
2. Is the Technology of ADAR a CW or pulsed signal?
3. Is it possible to use TX/RX at the same time? Or do you have to use only TX for example and terminate the RX channels? In this case I can use a horn antenna for a RX...
I would be very glad, if you can answer these questions.
Thanks in Advance...
Answers to your questions:
1. Evaluation board schematic is in the User Guide, available on the product webpage - also attached below. J1 and J2 are SMA connectors for the calibration path. Do you mean P1 and P2? Those contain various GPIO and SPI connections.
2. I don't know if I understand the question. Do you mean can you use a pulse or CW signal with the ADAR1000? If so, you can use either, just as long as you do not go beyond the absolute maximum ratings in the datasheet.
3. You cannot be in Tx mode and Rx mode at the same time; you can either be in Tx mode or Rx mode - you have to switch back and forth. Unused channels should be loaded with 50 Ohms.
thanks very much, you´ve answered all my questions.
Regarding the first question: No I don´t mean P1 and P2. I mean J1 and J2...could you give an example what you mean with calibration path? I thought only the Channel RF_IO is for the network analyzer....
Yes, you can drive up to 4 ADAR1000 chips using a single SPI interface. Please read the "Chip Addressing" section on page 27 for more information.
Can you clarify what you mean by "...examples how you can build up the technology".?
I read it, I understood that I can drive up 4 chips using a single SPI Interface. But I need also 4 ADAR Evaluation Boards right? Then I have the question how to connect them with each other and to the antennas.
and just another Topic: For what do the Eval Board need -5V? Can you give me the reason for that?
Thanks very much in advance.
The -5V supply is used for the external PA bias, LNA bias and switch bias pins.
If you are not using these pins, you can ground the AVVD1 -5V pin to consume a little bit of power.
Yes, you will need 4 ADAR1000 evaluation boards or a custom board you design with 4 ADAR1000's on it.
The P1 and P2 headers share the exact same connections on the exact same pins. They were designed this way to be used for board-to-board daisy chaining of the SPI signals (among other signals).