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Denki Guy
2 posts
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19-02-2010 05:06
The ATM18 Radio Computer article introduced a really interesting part, the Si4735 DSP radio chip. The feature that really caught my interest is the ability of this chip to tune the short wave band. I ordered and received the Si4735 module offered by Elektor.
The problem I am having is that the data sheet on the Silicon Labs web site is incomplete. It seems that there is a application note called, “AN332: Si47xx Programming Guide.” I wrote to Silicon Labs technical support and asked for a copy of this document but they have not resonded to my inquiry.
Has anyone else had any success locating this document? I have a real cool idea for a shortwave receiver using this chip but, I need the programming guide to design the software.
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hrh1818
2 posts
Popping In
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22-02-2010 04:39
Download the software for the ATM18 Radio Computer. Along with the code the zip file contains AN332, pictures and a copy of the article in German . The name of the zip file is 090740-11.zip.
Howard
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Denki Guy
2 posts
Popping In
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27-02-2010 05:23
Howard, thank you for the pointer. I wasn't expecting to find the data sheet and Application Notes packaged along with the source code.
Looking at the data sheet, I see there are seperate power pins for the radio and the interface. The input voltage range for the radio (Vdd) 2.7 - 5.5 V where as the voltage range for the interface is 1.5 - 3.6 Volts. It certainly seems safe to power the entire part from a 3.3 Volt power supply but I wonder why the two ranges are different. Will I get better better receiver performance by powering it at 5.0 Volts and powering the interface at 3.3 Volts?
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hrh1818
2 posts
Popping In
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28-02-2010 05:57
The data sheet gives the receiver specifications for a range for Vdd from 2.7 to 5.5 volts. Hence I see no reason to believe the receiver will have better performance if Vdd = 5 volts. My guess for the difference in power supply voltages for Vdd and Vio is that micro controllers I/O pins predominantly use 3.3 volt logic and Silicon Labs designed their digital radio I/O pins to be compatible with micro controllers. If they specified the same voltage range for Vio as for Vdd then level shifters would be required if the used wanted to use a 5 volt Vdd supply.
Howard
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