[linux-dvb] Re: Twinhan Visionplus USB DVB-t with at76c651/tua6010xs?

[F.J.Bernd.Wagner@t-online.de (Bernd Wagner)]

Hi Patrick,

it is in fact as you say: I identified also on my photos that the vp7041 
has a TUA6010XS as PLL. (The chip is in the shielded metal box). You can 
find a data sheet for this PLL on the pages of Infineon.

PLL means something like "power locked loop" as far as I remember. You 
stabilize an oscillator having a high frequency by dividing this 
frequency and comparing the quotient to the (very stable) frequency of a 
crystal oscillator of a lower frequency. So you can tune the high 
frequency as a multiple of the crystal oscillators frequency digitally 
by setting the divisor. (There may be additionally a constant offset 
between the high frequency and the the frequency of the TV station.)

Best regards

Bernd



Patrick Boettcher wrote:

> Hi,
>
> By accident I found some interesting lines in at76c651.c. The part, where
> the driver prepares the buffer for setting the frequency. The
> ready-to-send buffer is identical to the one I have to send to the vp7041
> for the exact same reason.
>
> So it seems that the vp7041 has also a tua6010xs for PLL (I don't know
> exactly what PLL is, but I can imagine what it does..).
>
> Is anyone aware of a dvb-t frontend which uses a tua6010xs?
>
> This could be important for the vp7041 users, because I don't know the
> dvb-chip on the device and there is no label on it (after removing
> the cooler). And just sending anonymous buffers to a device make it
> hard to optimize.
>
> Thanks,
> Patrick
>
>
>
>