hochopeper,
I participated to win the pole position for the F1 Australian Gran Prix.
wktk_smile I'm sorry,
the photophinish assigns you the victory! You win
hirez69
In that case, unfortunately, you might be more like Mark Webber than Fernando Alonso
Both good drivers but, Alonso's statistics speak volumes and he is the more accomplished driver for good reason, he is better.
What, another list and i'm missing?
Si570 interest list:
1. bigpandahk
2. tagheuer
3. hochopeper
4. qusp
5. AR2 - definitely!
6. wktk_smile
7. hirez69
8. CeeVee - you bet!
9. number9
10. analog_sa - GB maniac
Correct list:
Si570 interest list:
1. bigpandahk
2. tagheuer
3. hochopeper
4. qusp (of course)
5. AR2 - definitely!
6. wktk_smile
7. hirez69
8. CeeVee - you bet!
9. number9
10. analog_sa - GB maniac
number9: are you really interested in this GB, or did you just want to see yourself next to number 9? hehe
guys, please read the page carefully to make sure you are copying the complete list
Si570 interest list:
1. bigpandahk
2. tagheuer
3. hochopeper
4. qusp (of course)
5. AR2 - definitely!
6. wktk_smile
7. hirez69
8. CeeVee - you bet!
9. number9
10. analog_sa - GB maniac
number9: are you really interested in this GB, or did you just want to see yourself next to number 9? hehe
guys, please read the page carefully to make sure you are copying the complete list
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Power supply issue of Si570 clock board
The biggest challenge to the Si570 clock board project is the power supply. Silabs declared that Si570 has high PSRR performance and not that sensitive to the supply noise, but trust me, that’s not true. It needs more than 100mA power consumption, much bigger than normal XO oscillators. Although ADP151 is rated at 200mA output, but it really can’t keep good low noise performance at this current level.
Using a 3.2V LiFePO4 battery cell (together with the management board) powering si570 directly is a good solution, which I’m running right now. It works fine and sounds great. The only problem is that the output voltage of the battery is not fixed. During the whole discharge progress, voltage will keep dropping from 3.4V to 3.0V. Actually that’s not bad for a battery, but the interesting thing is, si570 has a sweet point on power supply voltage. It will take around half hour to make the battery running into that point and then Si570 becomes more and more sweet.
TPS7A4700 seems to be one of the best alternatives. It rated at 1A output, with only 4.17uVrms noise, industrial best so far. I designed a TPS7A4700 PCB last night and placed the order today. Hopefully it works for Si570.
Ian
The biggest challenge to the Si570 clock board project is the power supply. Silabs declared that Si570 has high PSRR performance and not that sensitive to the supply noise, but trust me, that’s not true. It needs more than 100mA power consumption, much bigger than normal XO oscillators. Although ADP151 is rated at 200mA output, but it really can’t keep good low noise performance at this current level.
Using a 3.2V LiFePO4 battery cell (together with the management board) powering si570 directly is a good solution, which I’m running right now. It works fine and sounds great. The only problem is that the output voltage of the battery is not fixed. During the whole discharge progress, voltage will keep dropping from 3.4V to 3.0V. Actually that’s not bad for a battery, but the interesting thing is, si570 has a sweet point on power supply voltage. It will take around half hour to make the battery running into that point and then Si570 becomes more and more sweet.
TPS7A4700 seems to be one of the best alternatives. It rated at 1A output, with only 4.17uVrms noise, industrial best so far. I designed a TPS7A4700 PCB last night and placed the order today. Hopefully it works for Si570.
Ian
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Ian, your productivity appears limitless!!
That's my daily job, my hobby takes the advantage of
.
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You are correct, running clock from a isolated clean PSU is one of the goals.
That three pin connector is to connect directly to the on board socket. Isolator will be powered from Si570 clock board by the FPC/FFC cable, no need any additional connection.
Ian