can someone confirm with us to get a a 15.5 dB gain on this ADL5565-EVALZ devboard.
I put zero Ohms for R3,4,5,6 and let R1 and R2 open but I did not get 15.5 Db gain. am I missing any thing or the datasheet is wrong.
Thank you.
ADL5565
Recommended for New Designs
The ADL5565 is a high performance differential amplifier optimized for RF and IF applications. The amplifier offers low noise of 1.5 nV/vHz and excellent...
Datasheet
ADL5565 on Analog.com
can someone confirm with us to get a a 15.5 dB gain on this ADL5565-EVALZ devboard.
I put zero Ohms for R3,4,5,6 and let R1 and R2 open but I did not get 15.5 Db gain. am I missing any thing or the datasheet is wrong.
Thank you.
avari - Moved from RF and Microwave to Amplifiers. Post date updated from Thursday, January 25, 2024 9:33 PM UTC to Thursday, January 25, 2024 9:34 PM UTC to reflect the move.
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:
From this equation, to get a gain of 1 (0 dB), the recommended value of RG 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. RG 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
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:
From this equation, to get a gain of 1 (0 dB), the recommended value of RG 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. RG 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?
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?
yes the source impedance is 50 Ohms.
Hi avari ,
Good day. For a gain of 0 dB, I would recommend removing R184 and R190 to set the differential Rg to 200 Ω, and here are the values for the other resistors:
Thank you.
Regards,
Gilbeys