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TSW1266EVM: Unable to acquire while using TSW1400 EVM and HSDC Pro ver 4.5

Prasidh Ramabadran
Prodigy 50 points

Part Number: TSW1266EVM

Greetings,

I am trying to use TSW1266 EVM with TSW1400 to acquire a complex modulated signal with "High Speed data Converter Pro" version 4.5. I followed the user manual of TSW1266 EVM which instructs to selec the device "ADS5402" from the drop own menu in the list of ADCs available on HSDC Pro. I couldn't find ADS5402 there and instead selected ADS5401-09 but I couldn't acquire a signal. I loaded the configuration file named "LMK04808_614p4M_Single_Loop.txt". I set my RF input frequency at 2.149GHz (-30dBm) and LO at 2.6GHz (0dBm)  as instructed by the user manual. 

I am not sure whether the PLL of the clock generator has locked since I don't find the LED 'D1' being lit as specified in the user manual which says "The LED labeled D1 on the board will light up indicating that both PLLs are locked." But I find that the LED 'D3' is lit. LED 'D3' is connected to the Lock Detect pin of LMK04808 as per page 5 of the schematic of TSW1266 EVM.

I am unable to figure out the cause behind failure to acquire any signal at all.  I suspect that the cause could be the firmware file that I have selected i.e. ADS5401-09.ini but not sure since I find this one to be the closest match to ADS5402I mounted on TSW1266 EVM among the ini files available. Could anyone kindly advise what could be the problem?

Thanks and Warm Regards,

Prasidh

  • 0
    TI__Mastermind 29220 points

    Hi,

    yes, the device selection ADS5401-09 is the correct one to use, as that range encompasses 5402 as well.   Since the initial release of the ADS5402 there have been a number of part numbers released for different speed grades, and as far as the TSW1400 with HSDCPro is concerned the devices ADS5401 through ADS5409 all look alike.  So that would not be the problem.

    The status pins from the clock device that go to the LEDs are all programmable, so I would have to open the config file to see what the programming is for those pins that go to the LEDs.  I could not say at the moment what the 'normal' appearance of the LEDs should be, although the User Guide should be correct on what it says to look for.   Sometimes there might be a more recent revision of software since the User Guide is published that might make the User Guide have old information but I do not think that is the case here.   We have not revised the SPI GUI software since release.   So I would be concerned if the LEDs did not match what the User Guide says they should be.   (did you use the 'reset' controls in the GUI for both the ADC tab and LMK tab as the User Guide says?  Just want to be sure that was not missed.) 

    One thing we can do first is to see if the SPI GUI is talking to the hardware properly.  One easy way to do that is to supply the power to the EVM by a bench supply with a current meter and see if the current drops when you use the SPI to power down.   The LMK tab has a power down control, so that could be used to power down the LMK and see if the current consumption by the board drops.  If so - the SPI is working to the LMK.  If not, then we would need to find out why.   The ADC does not have a power down control, unfortunately, but it has an enable pin.  The SPI could be used to set the pin for 'light sleep' and see how much the power drops when the enable jumper is moved. Then see how much the current drops if the SPI sets the pin for complete shutdown.  This will tell us if the SPI to the ADC is working.

    If the SPI is working, then I would next ask to see what you are seeing on HSDCpro when you capture from the EVM.  I've not used this EVM in a long time and do not have one in my lab, so I would have to order one first if I were to power it up in my lab.

    Regards,

    Richard P.

  • 0 in reply to Richard Prentice
    Prodigy 50 points

    Hi Richard,

    Thanks very much for your time and troubleshooting instructions. I find that the SPI connection to LMK is active. The current drawn by the board at bias voltage of 6V drops to 0.92A from 1.3A while LMK is powered down through the GUI. I set the sleep mode for EN pin of ADS5402 to "Complete Shutdown" and moved the jumper JP1 from position '1-2' to '2-3'. The current drawn by the board reduced to 0.7A from 1.3 A. The board's power consumption drops to 0.46A while LMK is powered down through GUI and simultaneously ADS5402 is put in 'Complete Shutdown' mode by moving the jumper JP1 from position 1-2 to 2-3. Is it expected to draw around 460mA of current while both LMK and ADS5402 are set in power down mode? The screenshot of the ADC tab on HSDC Pro while signal acquisition was attempted is attached for reference.

    Signal Settings  (As per the example provided in the user guide):

    LO: 2.6GHz @ 0dBm  Amplitude

    RF input: 2.1409GHz @ -25dBm amplitude

     

    Thanks and Warm Regards,

    Prasidh