MAX3580 DVB-T Reference Design
Abstract: The MAX3580 DVB-T reference design meets NorDig and MBRAI requirements. This NIM design includes the MAX3580 direct-conversion tuner and a COFDM DVB-T demodulator. A discrete, active loop-through with low power consumption and low cost is included.
Figure 2. System block diagram.![Figure 3. Data shows that there is at least 2dB margin to NorDig 1.0.2 in the VHF band.](//m.amcfsurvey.com/uphotos/fetch/201207_020/200881814912644.gif)
![Figure 4. Here the data shows that there is 3.5dB to about 5dB margin to NorDig 1.0.2 in the UHF band.](//m.amcfsurvey.com/uphotos/fetch/201207_020/200881814913945.gif)
Sensitivity Details for all Modes |
|
|
VHF |
UHF |
Frequency (MHz) |
177.5 |
226.5 |
474 |
570 |
674 |
770 |
858 |
QPSK, 8k, CR = 1/2, GI = 1/4 |
Sensitivity (dBm) |
-97.3 |
-97.3 |
-97.2 |
-97.1 |
-96.7 |
-96.5 |
-96.2 |
Max-Input (dBm) |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
QPSK, 8k, CR = 2/3, GI = 1/4 |
Sensitivity (dBm) |
-95.9 |
-95.7 |
-95.7 |
-95.6 |
-95.3 |
-94.9 |
-94.8 |
QPSK, 8k, CR = 3/4, GI = 1/4 |
Sensitivity (dBm) |
-94.8 |
-94.8 |
-94.7 |
-94.6 |
-94.5 |
-94.1 |
-94 |
QPSK, 8k, CR = 5/6, GI = 1/4 |
Sensitivity (dBm) |
-93.8 |
-93.7 |
-93.6 |
-93.6 |
-93.3 |
-93 |
-92.8 |
QPSK, 8k, CR = 7/8, GI = 1/4 |
Sensitivity (dBm) |
-93.3 |
-93.1 |
-93.1 |
-92.7 |
-92.7 |
-92.4 |
-92.2 |
16QAM, 8k, CR = 1/2, GI = 1/4 |
Sensitivity (dBm) |
-91.7 |
-91.7 |
-91.5 |
-91.5 |
-91.4 |
-90.9 |
-90.7 |
16QAM, 8k, CR = 2/3, GI = 1/4 |
Sensitivity (dBm) |
-89.8 |
-89.7 |
-89.5 |
-89.5 |
-89.3 |
-88.9 |
-88.8 |
16QAM, 8k, CR = 3/4, GI = 1/4 |
Sensitivity (dBm) |
-88.6 |
-88.3 |
-88.4 |
-88.1 |
-88.1 |
-87.5 |
-87.3 |
16QAM, 8k, CR = 5/6, GI = 1/4 |
Sensitivity (dBm) |
-87.1 |
-87 |
-87 |
-86.9 |
-86.9 |
-86.4 |
-86.3 |
16QAM, 8k, CR = 7/8, GI = 1/4 |
Sensitivity (dBm) |
-86.4 |
-85.7 |
-86.1 |
-85.9 |
-85.7 |
-85.4 |
-85.6 |
64QAM, 8k, CR = 1/2, GI = 1/4 |
Sensitivity (dBm) |
-87 |
-86.9 |
-86.9 |
-86.6 |
-86.7 |
-86.2 |
-85.9 |
64QAM, 8k, CR = 2/3, GI = 1/4 |
Sensitivity (dBm) |
-84.1 |
-84.1 |
-83.8 |
-83.8 |
-83.7 |
-83.3 |
-83.2 |
64QAM, 8k, CR = 3/4, GI = 1/4 |
Sensitivity (dBm) |
-82.5 |
-82.2 |
-82.3 |
-82.4 |
-81.8 |
-81.5 |
-81.4 |
64QAM, 8k, CR = 5/6, GI = 1/4 |
Sensitivity (dBm) |
-80.9 |
-80.9 |
-80.7 |
-80.7 |
-80.4 |
-80.2 |
-79.8 |
64QAM, 8k, CR = 7/8, GI = 1/4 |
Sensitivity (dBm) |
-79.9 |
-79.7 |
-79.5 |
-79.5 |
-79 |
-78.9 |
-78.8 |
Max-Input (dBm) |
-2 |
-0.2 |
0 |
0 |
0 |
0 |
0 |
Test conditions for supply current measurements include 75Ω terminations on RF input and TV output, active working mode, and system tuned to channel 69 (858MHz). This DVB-T receiver reference design is NorDig 1.0.2 and MBRAI compliant. It is intended for terrestrial set-top box applications and has a NIM form factor. The reference design covers the VHF-III band (170MHz to 230MHz) and UHF band (470MHz to 870MHz) and interfaces with a socket board for testing system performance.The reference design includes:
- A discrete LNA to realize an active loop-through. The loop-through has 14dB gain and less than 3.5dB noise figure, with 60mW of power consumption.
- A MAX3580 fully integrated silicon tuner, which includes an LNA, RF and IF VGAs, mixer and lowpass filtering in the baseband stages. The tuner operates from a single 3.3V power supply. Only a small number of passive components are needed to form a complete DVB-T RF front-end solution.
- A DVB-T/H-compliant demodulator that features the full DVB-T and DVB-H standards framing structure, channel coding, and demodulation.
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