c'mon guys, lets put our heads together to control a STA310 ac3 decoder

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#101
macgyver said:
Tomek_j:
Have you measured cut off frequency of the ST310 filter, when all speakers are set to "small"?

I couldn't see that in the datasheet.
Click to expand...

I can't measure this frequency - I hven't coding AC3 function generator sinus signal (for LFE channel) 🙂.
I thing, this frequency is describe in Dolby Digital (or DTS) documentation.
 
#102
hi guys,
i'm also working with a STA310. i acctually got two chips today but i would need a little help from you guys to get the thing running.

ps:
@tomek: can you please send me your shematics?? would be a great help and could save me a lot of time..
 
#105
Tomek,
I've a question about the STA310. To which voltage did you connect the VDDA and GNDA? Those two are the power supply for the S/PDIF link on the decoder. (Pin 28 and 29 on the chip)
I wanted to connect AGND to the "normal" digital ground. And AVDD I wanted to connect over an L-C-Filter to digital VDD with 3.3V. I don't know normaly there shouldn't come up these questions, but the datasheet of this device is very worse....
So, Tomek, how did you do it? Thanks.
Cheers
Holger
 
#106
flybysun said:
Tomek,
I've a question about the STA310. To which voltage did you connect the VDDA and GNDA? Those two are the power supply for the S/PDIF link on the decoder. (Pin 28 and 29 on the chip)
I wanted to connect AGND to the "normal" digital ground. And AVDD I wanted to connect over an L-C-Filter to digital VDD with 3.3V. I don't know normaly there shouldn't come up these questions, but the datasheet of this device is very worse....
So, Tomek, how did you do it? Thanks.
Cheers
Holger
Click to expand...
VDDA and GNDA pins power analog part S/PDIF receiver (PLL). You must have "clean" this voltage. It is important to prevents the switching noise present on the digital
supply from contaminating the analog power supply. In my project I have separate voltage regulator +3,3VA and sparate analog ground wire GNDA. Digital and analog ground are connect in one special point on the board.
 
#107
ok, so, that means you really connected it to the same ground as you used for the operational amplifiers for example. And the you have one star ground point on the board for digital and analog ground. I was alittle bit afraid to connect it to the analog power supply, 'cause I thought it's still a digital device. But ok, if it worked out ok with your design it should be ok. Then I'll spend a voltage regulator, too which makes 3.3 Volt.
Thanks, Tomek.
 
#108
flybysun said:
ok, so, that means you really connected it to the same ground as you used for the operational amplifiers for example. And the you have one star ground point on the board for digital and analog ground.
Click to expand...

That's right
I was alittle bit afraid to connect it to the analog power supply, 'cause I thought it's still a digital device. But ok, if it worked out ok with your design it should be ok. Then I'll spend a voltage regulator, too which makes 3.3 Volt.
Thanks, Tomek.
Click to expand...

You MUST connect digital ground and analog ground on the board. Without this your application will work incorrect. You see your digital to analog converter datasheet. Choose that point is very impotant
 
#109
ok, then I understood it right.
Yes I was looking at the datasheet of the DAC's. Did you really used just one connection between AGND and DGND? I was thinking to connect them (the power planes) via a silver wire. But I will do it in a way that I can change it later. So I can think about the place where to do it. I will have a transformer with power supply for the Analog and one transformer with power supply for the Digital part. On the pcb I will have voltage regulators for the different voltages. Like one seperate 3,3 regulator for the S/PDIF - supply of the STA310.
 
#111
hi guys,

i got a general question..
I'm working on the shematics and layouts right now but i have a little problem:
I make all my shematics in Eagle but the program has the needed librarys not.
I made the ST310 on my own, was no problem because the datasheet has all infos included, but i have problems creating the DACs.
I use the PCM1604 and the PCM1737 but there are no measuring datas or dimensions in the datasheet and so i got little trouble making the packages..

Just want to know if anyone of you maybe has Eagle librarys for those devices (PCM1604, PCM1737) or maybe measuring datas..

thanks,
Wolfi
 
#113
On page 2 of this thread are posts referring to datasheets for 6300 and 8200 chips. These are assembled in DVD players by very many names and are set up to decode any sort of audio that is derived from the on board DVD reader. The 8200 datasheet gives almost enough info to enable turning on the facility of the chip to handle an IEC60958 stream from any other box. You can tell from my name that I am an electric power man, but I have been breaking my head trying to use the on board decoder fro outputs from satellite boxes, HDTV etc. I reckon this route offers the simplest way to own a stand-alone 5.1, DTS etc decoder. My current opinion is that the three least significant bits in register 3 need to be altered from 001 to 010 or 011. The people on this thread must know how. A challenge from a Megawatt Man to a Microwatt Man or preferably, Woman! and I don't even think it could offenmd holders of IP, the licence fees have already been paid. it's just that the manufacturer chooses to select only for decoding of the on board reader.
 
#114
emuman100 said:
The only thing I could find is a simple prototyping board from www.twinindustries.com. It'll fit on a TQFP100 prototyping board. I was looking for a TQFP100 or TQFP80 to PGA or DIP, but I never had any luck. I found a TQFP80 to QFP80, and then I can put that on a QFP to DIP or PGA adapter which is easy to find. Aries electronics has them. If you know any other suppliers, please let me know.
Click to expand...

emuman.... the STA450's are easy enough to pull from any old XM radio.

The QFP80 with a .65 pitch to DIP adapters are available from http://www.accutekmicro.com/product_detail.cfm?Product=DIP Adapters

10 bux each Ouch. Service is good. Quality is OK.

The adapter is model :
AK80D900-QFP.65mm
QFP 0.65mm PITCH
TO 80 PIN DIP

Just an FYI
 
#118
I'm not sure what decoder you're talking about but my current project uses the STA400/STA450 decoder. I can get those from XM radios on Ebay all day long for much less than new without any minimums.

Sure, I have to remove them but, it's a hobby project, not an assembly line so, I don't mind the time factor.

I'm not sure what item uses the STA310 that you want but you might consider swapping to a more available model with the same or similar features.
 
#119
The STA310 Datasheet list the device contains 256 registers.
Two types of registers exist:
- From address 0x00 to 0x3F, the registers are real registers that can be initialized after reset.
- From address 0x40 to 0x100, they are memory locations. This means that the registers located at the
address 0x40 to 0x100 can have different meanings and usage according to the mode in which the
device operates.
Be careful that they can not be hardware reset: they contain undefined values at reset and require to
be initialized after each hardware reset.
In this document, only the user registers are described.
The undocumented registers are reserved. These registers must never be accessed (neither in Read nor in
Write mode).
The Read only registers must never be written

I not that understand this place,who can tell me??
 
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