ADAR1000 Eval board PA_BIAS not working


I have got the evaluation board for ADAR1000 and I was trying to generate PA_BIAS using the internal DAC, but not able to do so. I am interfacing the board with the software provided from you. I am following the below table from the datasheet:

I tried all the combinations described above in the GUI to generate some voltage on the pin 23 of connector P9A on the board which corresponds to PA_BIAS1. But I see nothing at all on the multimeter. 

On the GUI, these are the steps I followed in order:

1. Connect to the board using ADDR0/1 = 0 (jumpers are left open)

2. Initialized TX on the tab "Tx Control"

3. Wrote some values to off and on registers shown below and enabled BIAS_CTRL

4. Enabled TX_EN under T/R Control tab

5. Checked the multimeter on pin23 of connector P9A, to see nothing.

I also tried with LNA_BIAS_OUT feature but also seeing no output voltage. 

Am I missing something here?



Parents Reply
  • Hi

    I checked the P6 interface and I see that the SPI signals are passed on to it correctly. Check the snapshots below:

    I am writing data 0x0000BD to reset software and enable SPI 4 wire. The yellow probe is SPI_CLK, red is SPI_CSN, and blue is SPI_MOSI.

    P6 connector SPI lines:

    Signal on the P6 connector

    P2 connector SPI lines:

    Signal on the P2 connector

    I think the level shifters are working correctly as seen by the 1.8V p2p on P6 as compared to the 3.3V p2p on P2. 

    After writing BD, I tried reading the PRODUCT_ID by writing SPI_MOSI with on 0x800400, but I did not see any data on SPI_MISO probe.