This is another efficient way to
build a complete single or multi channel (up to
four) DOCSIS, EURODOCSIS, DVB-C, Cable modulator
(CMTS) or DVB-T modulator + RF Up converter.AD9789
: It's a 16-bit, 2400 MSPS DAC and supports up to
4 channels. It receives the data of the 4 sources
from the low cost FPGA in base band. The Digital
Upconverter can place the channels from 0 to 0.5
x fDAC. This permits 4 contiguous DOCSIS channels
to be synthesized and placed anywhere in the
DOCSIS band.
A CPU is needed to configure the AD9789
parameters (serial link). MVD IP cores base band
outputs are connected to the AD9789 DAC.
For parameters setting and PCB
recommendations, see Analog Devices AD9789
datasheet and app notes.
This solution supports up 4 channels. RF
engineering is greatly simplified by using
advanced digital techniques that reduces the
analog RF part of the design to very few
components.
Compact and high performance design can be
achieved at reasonable engineering and production
cost.
In order to allow customers to test this
solution, we have developped an evaluation board,
MVD-EV9789-V3 which converts
an MPEG TS stream into an IF or RF signal and
supports most of the digital TV standards (DVB-C,
J.83B, DVB-T, ATSC, DVB-S, ...).
Note d'application
- From MPEG-TS to RF using MVD FPGA IP
cores + Analog Devices AD9789 2.4 MSPS
TxDAC