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ADC12DJ5200RF: Power Supply query

KLN
Intellectual 310 points
Part Number: ADC12DJ5200RF
Other Parts Discussed in Thread: TPS62913, , TPS7A94, TPS7A92, TPS7A96, TPS74401, TPS7A84A, TPS7A52, TPS7A57, TPS7A54

Hi Team,

We are using 2 ADC12DJ5200 for 4 Channel 

I've few questions on power supply regulator + LDO vs Silent switch  TPS62913

Case1: Using Regulator + LDO,

Q1: Can the Digital 1.1V (VD11) Supply be directly sourced from Switching regulator or Should be from LDO?

Case2: Using Silent Switcher: TPS62913

Q2: For the silent switcher IC, Can you please share the PSRR values?

Q3: Which one do you suggest over Case1 vs Case2?

Q4: Related SPI Signals of ADC12DJ5200, Control signals are referenced to 1.9V(max), Can I directly connect the SPI signals to controller (Xilinx FPGA) 1.8 Level support? Or recommends level translator?

Thanks.

  • 0 in reply to KLN
    TI__Mastermind 33785 points

    Hi KLN,

    A 3.3V bias rail will work for the TPS7A52.  The TPS7A57 will want closer to 5V to meet both rails.

    I will send you a friend request and you can directly contact me to review your LDO schematic then.  If you need feedback on the ADC or other circuitry, you can contact the other TI engineers in this forum thread or simply open a new thread for them to review it and reference this one.

    Thanks,

    Stephen