This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Hi,
Can the PGA be used without the LNA? That is, can I only provide power to the PGA section and ground the power inputs for the LNA? My power budget is tight and I cannot afford the quiescent current draw of the LNA, but the datasheet says the supply voltage for the PGA must be less than the LNA, so I'm worried I might not be able to do so. Thanks.
Hello,
From the schematic in the datasheet, it would look like you would be able to power the PGA without needing to power the LNA. However, you do bring up a valid concern when it comes to that statement. I will have to look into this, and will have an update for you by the end of this week. What is the power supply range of your application (to the PGA section)?
Thank you,
Sima
Hello,
Unfortunately, you will not be able to power the PGA without powering the preamplifier (LNA). We were able to pull up the design schematics for this part, the power supplies between the two amplifiers share protection diodes. It turns out that the ESD protection circuitry is all based on the preamplifier powering on.
Thank you,
Sima