adjust the gain to 0 dB

Hi avari ,

Good day. Have you tried configuring the other components as stated in Table 18 of the datasheet?

Based on what you've posted, I think your configuration is correct.

May we know what your input is and how much gain did you measure? Can you also perform the continuity test on the resistance for check?

Regards,
Gilbeys

Thank you for the info. Now  we need to get a 0 dB gain for a differential configuration, could please tell us what resistors and with what values to use:

Hi avari ,

Good day. The formula of the differential gain of ADL5565 is given by the formula:

RL is recommended to be 200 ohms but can vary depending on your application. Based on this, we can derive the value of RG to be:

^{R_G=\frac{200}{Av}\times\frac{R_L}{10+R_L}}

From this equation, to get a gain of 1 (0 dB), the recommended value of R_G will be 190.5 or 191 ohms. Since VIP1/VIN1 had an internal resistor of 100 ohms then the recommended external resistor will be 91 ohms. Also, if you are to use VIP2/VIN2, I recommend using an external resistor of 141 ohms. R_G is the gain-setting resistor.

However, it would be better if follow this configuration in the "Gain Adjustment And Interfacing" section of the datasheet:

With the following resistor values:

Hope this helps.

Regards,
Gilbeys

based on the table, how much RS and Rshunt got to be? it looks to me for a 0dB I need Rs = 200Ohms and Rshunt to be 28.8 Ohms. Could you please confirm?

Hi avari ,

Good day. That should be the case. 

Regards,
Gilbeys

Hello,

It appears that the above question has been answered already so I'm temporarily closing this thread. In case there are additional questions, feel free to reply to this thread. Thank you!

Best regards,
Paul

i am back to this issue again. 

Could you please be specific about the resistors values for a 0 dB gain as per the schematics I shared with you. I need values for: R181, R192,R184, R185, R188, and R190.

Thank you, 

i am back to this issue again. 

Could you please be specific about the resistors values for a 0 dB gain as per the schematics I shared with you. I need values for: R181, R192,R184, R185, R188, and R190.

Thank you

can anybody from the support team get back to us? 

Hi avari ,

Good day. Can you provide the source impedance? Or should we assume it to be 50 ohms which is a common source impedance? Thank you.

Regards,
Gilbeys