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ADC3244EVM: ADC3244EVM redesign

Dong Ba
Intellectual 1145 points

Part Number: ADC3244EVM
Other Parts Discussed in Thread: THS4541

Hi team,

Please help the customer with issue bellow.

I want to use THS4541 differential amplifier onto the board to amplify my input signal by the gain 10 V/V. To do this, I will first modify the board to arrange it in DC-coupling mode. I will make the modifications given in the board datasheet, Table 6 (on page 13). I am also putting this table at the attachment.

Afterwards, to set the gain of the amplifier to 10, I will change the resistor R98 with 170 Ohm, R92 with 23.6 Ohm and R93 with 35 Ohm. I will switch the position of jumper SJP1 to 1-2. Therefore, R96 and R97 will be in parallel which results 27 Ohm and my total termination resistance value will be 35+27 = 62 Ohm. So, I will achieve the resistance values for gain 10 V/V which is given on Table.1 of THS4541 datasheet on page 23. I am also putting the schematic of THS4541 and the gain table at the attachment.

Please could you confirm my approach?

B.R.

Eric

  • 0
    TI__Mastermind 24550 points

    Hi Eric,

    Regarding the question about modifying the EVM to DC coupled mode, you are correct. I have just reviewed the schematics and can confirm that these component changes are correctly listed in the user guide.

    Regarding setting the gain to 10V/V , these components changes are correct but I believe you may have missed setting the Rf to 402 ohms (which is what Table 1 reflects). For channel A, the feedback resistors would be R94 and R95. Every other component value you suggest is correct.

    Regards, Chase