I'm trying to put the CS5463 chip functional using the example circuitry on page 41 of the datasheet (attached bellow):
Right now, I'm working on the top part of the circuit, which is the IC power source. I've ran some simulations on Multisim and, apparently, this part is completely functional. But before proceeding to some other part of the circuit I want to understand what every component is there for. I did my research so I didn't arrive empty-handed.
470 nFcapacitor: is it a decoupling capacitor, which filters a possible DC signal from the power line? I couldn't extract this information from my simulations. I had the impression that it does something else…
500 ohmsresistor in series with the capacitor mentioned just before… Is it a simple current limiter? My guess is yes, it is, and its function is to limit the current from the negative cycle of the power line.
From the simulations, I've learned that this capacitor and resistor in series are exposed to great voltages. The capacitor, for instance, is exposed to tensions up to
295 Volts(the power grid I'm on is
220 Volts RMS). Are there any capacitors of the order of nanofarads that can handle that much?
About the diodes: the first one is there to close the circuit on the negative cycle. The second one's purpose is to prevent the power grid to drain energy stored on the
470nFcapacitor when the power grid is on the negative cycle.
470nFcapacitor: is the component that charges energy from the positive cycle of the power grid to discharge it on the negative cycle.
The Zener diode: works as a voltage regulator, keeping the voltage on, approximately,
500 ohmsresistor before the Zener diode: creates a voltage difference between the
470uFcapacitor and the Zener diode when the loaded tension on the capacitor is greater than the one the zener diode is holding (approximately
Are my hipothesys correct?
0.1 uFcapacitors: would they be
by-pass capacitors? Would they function as a "virtual ground" for the AC signal?
Why there is a
10 ohmsresistor between the VA+ and VD+ source pins? Why are the AGND and DGND ground pins short-circuited?
I chose the
1N4733Ato be the Zener diode. Is it a easily found component (local stores)? Would there be other suggestions?