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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.

NorDig Compliance

MBRAI Compliance

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.

关键词： 电子电路图，MAX3 DVB D