Hi,
I have attached a part of the datasheet for a FTDi device.
The evaluation schematic board has a filter and 10nF connected between VBUS1 and 0V. I can't see the point of the filter as VBUS1 is connected directly to the FTDI chip (pin 12)?
The FTDI hardware recommendations state there is a different filter configuration. This makes more sense as the VBUS is filtered to obtain a clean 5V0 supply that would then power the FTDi chip.
Do I need to include the first schematic (ferrite + 10nF) and then from the ferrite/10nF junction add the second schematic for additional filtering i.e. 10nF + ferrite (BK0) + 100nF + 4.7uF?
Which one do I use or is it a combination of both?
Thanks in advance.
![upload_2021-5-12_20-37-3.png upload_2021-5-12_20-37-3.png](https://makerv2.webteractive.co/forums/data/attachments/50/50228-94f79579b9262e5cb8eff15cf38d488d.jpg)
![upload_2021-5-12_20-37-21.png upload_2021-5-12_20-37-21.png](https://makerv2.webteractive.co/forums/data/attachments/50/50229-cd4776eb2092438eb37cb76fd5d49026.jpg)
I have attached a part of the datasheet for a FTDi device.
The evaluation schematic board has a filter and 10nF connected between VBUS1 and 0V. I can't see the point of the filter as VBUS1 is connected directly to the FTDI chip (pin 12)?
The FTDI hardware recommendations state there is a different filter configuration. This makes more sense as the VBUS is filtered to obtain a clean 5V0 supply that would then power the FTDi chip.
Do I need to include the first schematic (ferrite + 10nF) and then from the ferrite/10nF junction add the second schematic for additional filtering i.e. 10nF + ferrite (BK0) + 100nF + 4.7uF?
Which one do I use or is it a combination of both?
Thanks in advance.
![upload_2021-5-12_20-37-3.png upload_2021-5-12_20-37-3.png](https://makerv2.webteractive.co/forums/data/attachments/50/50228-94f79579b9262e5cb8eff15cf38d488d.jpg)
![upload_2021-5-12_20-37-21.png upload_2021-5-12_20-37-21.png](https://makerv2.webteractive.co/forums/data/attachments/50/50229-cd4776eb2092438eb37cb76fd5d49026.jpg)