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参数资料
| 型号： | AT76C651 |
| 厂商： | ATMEL CORP |
| 元件分类： | 消费家电 |
| 英文描述： | Digital Reception/Transmission Integrated DVB compliant QAM Demodulator(兼容DVB的正交振幅调制解调电路) |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 封装： | TQFP-100 |
| 文件页数： | 14/37页 |
| 文件大小： | 497K |
| 代理商： | AT76C651 |
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AT76C651
14
Figure 6.
Received Spectrum Used to Measure Degradation with Echoes
Phase Noise Tolerance
Table 7 indicates the additional degradation when a phase
noise of -80 dBc at 10 kHz is present after the tuner, for
uncoded QAM at BER = 10
-4
.
AM Hum Tolerance
Input amplitude variation of 20% peak-to-peak can be sup-
ported by the demodulation at frequencies 100 - 120 Hz.
Locking Time
5 to 10 ms, when no echoes are present
20 ms typical when echoes are present (see Figure 6)
Carrier Offset
Up to 12% of the symbol rate: ± 1 MHz at 8M baud.
Timing Offset
Up to 4000 ppm of the symbol rate (± 30 kHz at 8M baud).
Table 7.
Modulation Scheme
C/N Degradation at BER = 10
-4
QPSK
0.1 dB
QAM-16
0.1 dB
QAM-32
0.1 dB
QAM-64
0.1 dB
QAM-128
0.1 dB
QAM-256
0.1 dB
QAM-512
0.3 dB
QAM-1024
0.9 dB
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