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Hi all, can I please ask for tips & review of my circuit for a FM radio? I am using Si4705 for the radio receiving and I would like to have the option for both embedded and headphones antenna. I tried to follow the datasheet and antenna guidelines of Si4705, but I would like to ask if the circuit I end up with makes sense:
I am using a 3.5mm jack with left and right channels coming from the audio codec (that has Si4705 as one of its inputs) and I also have a headphone detection circuit - the large GND pin of the headphone jack has two connections. One of them goes to ground, while the other is pulled up with 100k resistor. Thus when headphones are inserted the pin will read low, otherwise high. Can I please ask if this setup makes sense and if I have placed the components correctly on the schematic below:
Especially if the ferrite beads are chosen well and placed correctly (BLM18BD252SN1D), and the same for the ESD protection diodes (TPD1E05U06DPYR).
Below is the schematic of the Si4705 circuit that contains also the extra filtering for the antenna inputs:
Thanks so much for your help!
I am using a 3.5mm jack with left and right channels coming from the audio codec (that has Si4705 as one of its inputs) and I also have a headphone detection circuit - the large GND pin of the headphone jack has two connections. One of them goes to ground, while the other is pulled up with 100k resistor. Thus when headphones are inserted the pin will read low, otherwise high. Can I please ask if this setup makes sense and if I have placed the components correctly on the schematic below:
Especially if the ferrite beads are chosen well and placed correctly (BLM18BD252SN1D), and the same for the ESD protection diodes (TPD1E05U06DPYR).
Below is the schematic of the Si4705 circuit that contains also the extra filtering for the antenna inputs:
Thanks so much for your help!
