ADP150 and capacitor choise

I am building an voltage source with an ADP150.

According the datasheet I need to use capacitors

with a low ESR for the best results. Ok, SMD is

not my favorite due all those datasheets. I can

find the X7R model but can someone tell me

which type is within the specs with an ESR of

0,001-0,2ohm? I really want to go for the

best results. The used capacitors are 1uF & 10uF.

Greetings Roelf.

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  • As seen in the pre-design, I have the C4 on the top-layer and FB on the bottem-layer what is the same layer for the supply circuits. But it is an overthinking worth at which point the FB/C4 filtering takes place. Design rules I have made are 1 separated supply for analog and 1 for digital (also ground), no crossings/long lines at regulated supply, exception is the RF lines with an 1206 0Ohm with the spacings filled as ground. The intention is to connect analog/digital ground together is under the DDS with FB's. Due this the internal ground of the DDS will also getting a lower internal resistence. BTW, the big square around the DDS is a heathsink for stabilizing frequency drift. The complete project will be 2 PCB's. 10x10 (DDS) and 10x6 (filter/amplifier). This is done to easily select/change the desired component for a specified frequency. And it will fit into an Eurocard format canning. The digital part will be controlled by a simple STM32F1 for bitbanging the selected protocol and doing the control lines. This STM will be serial controlled due a fiber by another controller at least there is 100% separation. You have now an idea on what I working at Jason. But it is freetime hobby so give me a year to finish it completely.

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  • As seen in the pre-design, I have the C4 on the top-layer and FB on the bottem-layer what is the same layer for the supply circuits. But it is an overthinking worth at which point the FB/C4 filtering takes place. Design rules I have made are 1 separated supply for analog and 1 for digital (also ground), no crossings/long lines at regulated supply, exception is the RF lines with an 1206 0Ohm with the spacings filled as ground. The intention is to connect analog/digital ground together is under the DDS with FB's. Due this the internal ground of the DDS will also getting a lower internal resistence. BTW, the big square around the DDS is a heathsink for stabilizing frequency drift. The complete project will be 2 PCB's. 10x10 (DDS) and 10x6 (filter/amplifier). This is done to easily select/change the desired component for a specified frequency. And it will fit into an Eurocard format canning. The digital part will be controlled by a simple STM32F1 for bitbanging the selected protocol and doing the control lines. This STM will be serial controlled due a fiber by another controller at least there is 100% separation. You have now an idea on what I working at Jason. But it is freetime hobby so give me a year to finish it completely.

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