リファレンスデザイン4173
に含まれる内容：
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 1. The reference design for the NorDig and MBRAI DVB-T tuner features the MAX3580.
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. Figure 4. Here the data shows that there is 3.5dB to about 5dB margin to NorDig 1.0.2 in the UHF band.
Parameter
Conditions
Measured
NorDig
Units
Operating Frequency Range
VHF-III Band: 170MHz to 230MHz
–
UHF Band: 470MHz to 870MHz
–
Sensitivity, Gaussian Channel
QPSK, 8k, CR = 1/2, GI = 1/4
-97.3
-94.6
dBm
16QAM, 8k, CR = 3/4, GI = 1/4
-88.5
-85.1
64QAM, 8k, CR = 7/8, GI = 1/4
-79.6
-77.2
Sensitivity, Gaussian Channel
QPSK, 8k, CR = 1/2, GI = 1/4
-96.6
-92.1
dBm
16QAM, 8k, CR = 3/4, GI = 1/4
-87.9
-82.6
64QAM, 8k, CR = 7/8, GI = 1/4
-79.6
-74.7
Maximum Input, Gaussian Channel
64-QAM, 8k, CR = 2/3, GI = 1/8
> 0
-35
dBm
64-QAM, 8k, CR = 2/3, GI = 1/4
> 0
-35
64-QAM, 8k, CR = 3/4, GI = 1/8
> 0
-35
Maximum Input, Gaussian Channel
64-QAM, 8k, CR = 2/3, GI = 1/8
> 0
-35
dBm
64-QAM, 8k, CR = 2/3, GI = 1/4
> 0
-35
64-QAM, 8k, CR = 3/4, GI = 1/8
> 0
-35
Adjacent Channel Selectivity
N+1 DVB-T adjacent channel
47
≥ 28
dBc
N-1 DVB-T adjacent channel
45
N+2 DVB-T adjacent channel
47.8
≥ 38
N-2 DVB-T adjacent channel
46
Case
Category
Measure
MBRAI
Units
Selectivity, S1 Pattern
N+1
Category a, b1
48
37
dBc
N+1
Category b2, c
45
37
dBc
N-1
Category a, b1
54
37
dBc
N-1
Category b2, c
51
37
dBc
N+2
Category a, b1
47
37
dBc
N+2
Category b2, c
55
37
dBc
N-2
Category a, b1
45
37
dBc
N-2
Category b2, c
58
37
dBc
Selectivity, S2 Pattern
N+1
Category a, b1 and b2, c
39
29
dBc
N-1
Category a, b1 and b2, c
38
29
dBc
N+2
Category a, b1
43
40
dBc
N+2
Category b2, c
45
40
dBc
N-2
Category a, b1
42
40
dBc
N-2
Category b2, c
44
40
dBc
Linearity L1
–
Category a, b1
45.5
45
dBc
–
Category b2, c
47
45
dBc
Linearity L2
–
Category a, b1
45.2
45
dBc
–
Category b2, c
47
45
dBc
Linearity L3
–
Category a, b1
40.7
40
dBc
–
Category b2, c
42
40
dBc
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
Parameter
Conditions
Measured
Units
5V LNA Supply Current
12
mA
5V for Tuner and LNA*
{8k, QPSK , CR = 1/2, GI = 1/4}
196
mA
{8k, 64QAM, CR = 7/8, GI = 1/4}
196
mA
3.3V Digital Supply Current for Demodulator
{8k, QPSK, CR = 1/2, GI = 1/4}
8
mA
{8k, 64QAM, CR = 7/8, GI = 1/4}
10
mA
2.5V Analog Supply Current for Demodulator
{8k, QPSK, CR = 1/2, GI = 1/4}
36
mA
{8k, 64QAM, CR = 7/8, GI = 1/4}
36
mA
1.0V Digital Supply Current for Demodulator
{8k, QPSK, CR = 1/2, GI = 1/4}
90
mA
{8k, 64QAM, CR = 7/8, GI = 1/4}
92
mA
1.0V Analog Supply Current for Demodulator
{8k, QPSK, CR = 1/2, GI = 1/4}
3
mA
{8k, 64QAM, CR = 7/8, GI = 1/4}
3
mA
*Note: the MAX3580 uses 3.3V voltage drawn from a 5V LDO .
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.
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.
フィードバックをお寄せください。 フィードバックをお待ちしています。 —マキシムはお客様からいただく訂正、提案を元に改善していきます。
このページを評価し、フィードバックを送信する。
APP 4173: May 12, 2008
リファレンスデザイン4173,
AN4173,
AN 4173,
APP4173,
Appnote4173,
Appnote 4173
試験済み回路 
