Hello,

Silabs made an all in one chip for making a radio for AM/SW and FM with manual tuning, the Si4835.
See the attached datasheet for more info.

Bertus

 

Silabs makes a whole family of such chips (Si47xx and Si48xx -- Digikey has a lot of them listed). I investigated on paper some of them, as many are claimed to have a lower limit of 504 kHz with digital tuning, which is below the usual USA AM band and very close to the 500 kHz I want. I would prefer something that would go a little lower.

Right now, though, I am playing with another neat chip from Bosch. Had never thought of it as an electronics supplier. Apparently, it is quite active in automotive sensors.

John

 

It has Lw band which is down to 150khz.

 

I could not find that specification. Some of the similar chips do have a low band for in the 150 kHz region for RFID, but that tuning band tops at about 200 to 250 kHz, as I recall.

John

 

Hello,

The 4835 has no LW in the chip.
In the magazine FUNK AMATEUR there was a short description:



Sorry for the german text, but an image can not be translated.

Bertus