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ADS5294: Internal INP and INM circuit

Harsh Shirke
Prodigy 130 points
Part Number: ADS5294
Other Parts Discussed in Thread: THS4509,

Tool/software:

Hello,

I want a ADS5294 internal Input circuit simulation model for my design reference as i'm using a THS4509 part for this to see the output for as a testing purpose,

So, Please anyone provide me a internal input circuit of ADS5294 simulation module.

Below image is for reference that i want the this internal circuit simulation module.

  • 0
    TI__Expert 7565 points

    Hi,

    We dont have any simulation model for this . The circuit diagram is given in datasheet as attached by you . You can make this circuit in the simulator tool you are using and evaluate .

  • 0 in reply to Sachin H K
    Prodigy 130 points

    Thanks for response sachin,

    But in that circuit S and SZ mosfet used but what should i consider that open GATE points of that and what should i have to implemented on that GATE Point of mosfet to siimulate my design.

    Best Regard,

    Harsh

  • +1 in reply to Harsh Shirke
    TI__Expert 7565 points

    S Mosfet- On during sampling phase

    SZ Mosfet - On during convert phase 

    ADC_CLK when it is high you can assume it to be in  sampling phase .

    ADC_CLK when it is lowyou can assume it to be in  convert phase .

    I assume you will be interested in sampling phase impedance . In this case you can replace the transistor with the resistor value  = ron . 

     

    SZ MOSFETs' open ends connect to common mode potential, while they don't impact the inputs' loading. Users may treat the open ends as high impedance nodes. - Given in datasheet 

  • 0 in reply to Sachin H K
    Prodigy 130 points

    Thanks sachin for the support.

    Best Regard,

    Harsh