ADRV9002 POWER DOWN ISSUE

Question

Hi, 
 I am using CUSTOM ADRV9002 board with ZCU102 EVAL board. 
 In our board we are using TWO ADRV9002 ICs. 
 There is no problem , while working with individual ADRV transceiver, 
 but when I am trying to program two ADRV transceivers at a time I am getting voltage drop and load current is increasing. 
 After that the board is not working . 
 
 How to solve this issue ?

M_Bugajski · Accepted Answer

Hi LAXMIPRASANNA, 
 A failure mode that manifests by shorting all supplies to ground is usually permanent as it would cause significant and permanent internal damage, and this would not something that you can fix by simply resetting the part and programming it again. At least, not on the ADRV9002. Therefore I must maintain that the issue is likely external, and probably caused by the power supply. 
 It's clear to me that your power supply solution requires more work. You fixed the issues that I pointed out in my previous reply, but did not pay attention to any other issues in your design. For example, the ADP1754 requires an input voltage at least 0.4 V above the output voltage, whereas you're supplying it with 2.1 V and expecting 1.8 V output. 
 This forum is intended to support customers with challenges that they encounter when using the ADRV9002/3/4, and debugging your power delivery solution is outside the scope of what we offer. Therefore, I cannot help you until you can guarantee that the power supply that you have built is capable of supplying the needs of two ADRV9002s. 
 Kind Regards, Michał)

M_Bugajski · Answer

Hi LAXMIPRASANNA, 
 Please verify that your power supplies remain within tolerances at all times while programming the parts. 
 Kind Regards, Michał

M_Bugajski · Answer

Hi LAXMIPRASANNA, 
 I have never seen this happen on the ADRV9002 before. Are all of the voltage rails in the ADRV9002 at ground when the failure occurs? I think it might warrant a second look at your power solution: 
 1. According to its datasheet, the ADP1762 requires a minimum supply voltage of 1.1 V. Here, you state that you supply it with 1.0 V 
 2. According to its datasheet, the maximum current output current of the ADP1754 is 1.2 A. It looks like you built your design expecting it to supply 2.0 A 
 3. Only the first two channels of the ADP5054 are capable of supplying 6.0 A of current per channel. Channels 3 and 4 can only supply up to 2.5 A per channel. It looks like your design expects channels 3 and 4 to supply 6.0 A, the same as channels 1 and 2 
 
 Since you are using No-OS, I can't help you with debugging from the software side. In the SDK that we supply, we have two APIs for running a basic system test (in-system debugging) to verify that basic functions are operating as expected: adi_adrv9001_Utilities_SystemDebugPreCalibrate() , and adi_adrv9001_Utilities_SystemDebugPostCalibrate() . It may be worthwhile checking if No-OS has anything similar, and trying to run it on your system. 
 Kind Regards, Michał

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ADRV9002 POWER DOWN ISSUE