Anyone REALLY good with electronic circuits?

Author	Message
lew247 Guru Joined: 23/12/2015 Location: United Kingdom Posts: 1709	Posted: 07:32am 29 May 2022       Apologies, I should have made it much clearer, I see things in my head what I want to know but it's really hard to put it into words most of the time After spending hours reading the datasheet of the AD8307 and trying to understand how it works with the output of the 6Mhz saw filter in the tuner I "think" I finally understand it It converts an RF signal to a DC voltage (I believe) In the datasheet it says   Quote   The output is a voltage scaled 25 mV/dB, generated by a current of nominally 2 ?A/dB through an internal 12.5 k? resistor. This voltage varies from 0.25 V at an input of ?74 dBm (that is, the ac intercept is at ?84 dBm, a 20 ?V rms sine input), up to 2.5 V for an input of +16 dBm Am I right in thinking that the maximum output of the AD8307 on the output pin is 2.5V and the voltage increases from 25mv for a very weak signal to 2.5v for a very strong one? Also with regard to the rf tuner What exactly does AGC "take over point" mean? I want to be able to switch between wanting to hear strong signals and weak signals using the I2c bus I want to be able to switch between town strong signals due to lots of signals being recieved and I need the gain turned down to motorway driving where I need weak signal detection and the gain turned up high Am I right in thinking if I set the AGC pin to 115 dBµV then it will detect weaker signals better and if I set it to 103 dBµV it would be better if the signals were stronger and I need a weaker signal gain? Edited 2022-05-29 17:54 by lew247