Hi,
I study a PCB for a DSP adau1466 from Analog Device.
The datasheet proposes a layout implementation diagram as shown on page 200 of its datasheet. The layout diagram is attached.
A lot of capacitors are BYPASS caps and I would like to know what is the best type to use: MLCC ? Film (what type) ?
Thank you for your reply
I study a PCB for a DSP adau1466 from Analog Device.
The datasheet proposes a layout implementation diagram as shown on page 200 of its datasheet. The layout diagram is attached.
A lot of capacitors are BYPASS caps and I would like to know what is the best type to use: MLCC ? Film (what type) ?
Thank you for your reply
Attachments
The factory push-sheet has explicit notes on sides and layers. Much more than that tiny peek in post #1.
https://www.analog.com/media/en/technical-documentation/data-sheets/adau1462-1466.pdf pages 197 onward
Sadly it does not specify capacitor types, so your advice is valued.
Not COG/NP0. They should be X7R or X5R. COG is large package, high Q. COG is almost never used in decoupling and you can always realize a lower inductance overall PDN with the higher density MLCCs.
I agree that topside is safest, but it's not strictly necessary and perhaps not even optimal depending on board stack-up. However, if OP doesn't know exactly what they are doing and why it is the safer approach.
Some useful further info:
https://www.edn.com/bypass-capacitor-resonances/
https://techweb.rohm.com/knowledge/emc/s-emc/03-s-emc/7669
https://www.edn.com/bypass-capacitor-resonances/
https://techweb.rohm.com/knowledge/emc/s-emc/03-s-emc/7669
Thank you for your replies,
meantime I have found the information in the Datasheet of the 1466 Evaluation Board: it includes a detailed schematic with an exhaustive list of the parts that are soldered on the evaluation board.
This list specifies in a very detailed manner, each part: type, value, dielectric, tolerance, etc, not only for the capacitors but also for the resistors or anything else.
Obviously, the parts that are recommended by Analog Device for surrounding the 1466 DSP (in the 1466 datasheet) are present on the Evaluation board, so the answer is written on this datasheet 😎🙂 👍
meantime I have found the information in the Datasheet of the 1466 Evaluation Board: it includes a detailed schematic with an exhaustive list of the parts that are soldered on the evaluation board.
This list specifies in a very detailed manner, each part: type, value, dielectric, tolerance, etc, not only for the capacitors but also for the resistors or anything else.
Obviously, the parts that are recommended by Analog Device for surrounding the 1466 DSP (in the 1466 datasheet) are present on the Evaluation board, so the answer is written on this datasheet 😎🙂 👍