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ADS54J60: I am facing is " I am giving an input frequency of 500KHz to the ADS54J60 (period - 2us). But when the samples that are plotted in HSDC Pro is giving 400KHz(period - 2.5us)".

Part Number: ADS54J60
Other Parts Discussed in Thread: LMK04828,

Tool/software:

Hello,

I have custom board with LMK04828 and ADS54J60 in it. I have configured the register required. I have measured the clocks generating from the LMK04828, 122.88Mhz sys_clock, 3.84Mhz sys_ref, and adc sampling frequency is 983.04Mhz. 

The register data is given in "ADS54J60_ZC706.cfg" file.

The issue that I am facing is " I am giving an input frequency of 500KHz to the ADS54J60 (period - 2us). But when the samples that are plotted in HSDC Pro is giving 400KHz(period - 2.5us)".

I have attached a screenshot of the pulse plotted in HSDC Pro. I have measured the frequency at the input of the ADC which was 500KHz, but in the image you can see that it is in 390 - 400KHz.

What is causing this problem. Please let me know what are the changes to done and if you need any details related to this.

Thank You,  

There is no decimation enabled.  ADS54J60_ZC706.cfg

  • Hi Karthik,

    I assume the .cfg file is your register write listing? If so, can you please send that over in a txt file?

    And I will review it.

    Have you verified that indeed the correct clocks, you noted above, are being delivered to the ADC and FPGA with an oscope?

    Thanks,

    Rob

  • Hi Rob,

    I have verified the clock signals oscilloscope.

    Here is the ".txt" file 

    LMK04828 
    0x00 0x10
    0x02 0x00
    0x100 0x18
    0x101 0x55
    0x103 0x00
    0x104 0x20
    0x105 0x00
    0x106 0xF0
    0x107 0x11
    0x108 0x03
    0x109 0x55
    0x10B 0x00
    0x10C 0x20
    0x10D 0x00
    0x10E 0xF0
    0x10F 0x66
    0x110 0x08
    0x111 0x55
    0x113 0x00
    0x114 0x00
    0x115 0x00
    0x116 0x79
    0x117 0x01
    0x118 0x08
    0x119 0x55
    0x11B 0x00
    0x11C 0x00
    0x11D 0x00
    0x11E 0x79
    0x11F 0x01
    0x120 0x08
    0x121 0x55
    0x123 0x00
    0x124 0x00
    0x125 0x00
    0x126 0x79
    0x127 0x01
    0x128 0x08
    0x129 0x55
    0x12B 0x00
    0x12C 0x00
    0x12D 0x00
    0x12E 0x79
    0x12F 0x01
    0x130 0x18
    0x131 0x55
    0x133 0x00
    0x134 0x00
    0x135 0x00
    0x136 0xF0
    0x137 0x01
    0x138 0x20
    0x139 0x03
    0x13A 0x03
    0x13B 0x00
    0x13C 0x00
    0x13D 0x08
    0x13E 0x03
    0x13F 0x00
    0x140 0x00
    0x141 0x00
    0x142 0x00
    0x143 0x11
    0x144 0xFF
    0x145 0x00
    0x146 0x10
    0x147 0x1A
    0x148 0x02
    0x149 0x42
    0x14A 0x33
    0x14B 0x16
    0x14C 0x00
    0x14D 0x00
    0x14E 0x00
    0x14F 0x7F
    0x150 0x03
    0x151 0x02
    0x152 0x00
    0x153 0x00
    0x154 0x78
    0x155 0x00
    0x156 0x7D
    0x157 0x00
    0x158 0x96
    0x159 0x06
    0x15A 0x00
    0x15B 0xD4
    0x15C 0x20
    0x15D 0x00
    0x15E 0x00
    0x15F 0x0B
    0x160 0x00
    0x161 0x01
    0x162 0x44
    0x163 0x00
    0x164 0x00
    0x165 0x0C
    0x166 0x00
    0x167 0x00
    0x168 0x0C
    0x169 0x59
    0x16A 0x20
    0x16B 0x00
    0x16C 0x00
    0x16D 0x00
    0x16E 0x13
    0x17C 0x15
    0x17D 0x0F
    LMH6401 
    0x02 0x20
    ADS54Jxx_ANALOG 
    0x00 0x81
    0x8020 0x00
    0x8021 0x00
    0x8022 0x00
    0x8026 0x00
    0x8053 0x00
    0x8055 0x00
    0xF74 0x00
    0xF75 0x00
    0xF76 0x00
    0xF77 0x00
    0xF78 0x00
    ADS54Jxx_DIGITAL 
    0x680000 0x00
    0x690000 0x80
    0x690001 0x02
    0x690002 0x00
    0x690003 0x00
    0x690005 0x80
    0x690006 0x07
    0x690007 0x09
    0x690016 0x80
    0x6A0016 0x02
    0x614000 0x00
    0x614001 0x00
    ADS54Jxx_LOWLEVEL 
    0x4003 0x00
    0x4004 0x00