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參數(shù)資料
| 型號(hào)： | MT312T-Y |
| 廠商： | Marktech Optoelectronics |
| 英文描述： | 2x4mm Rectangular LED Lamps |
| 中文描述： | 2x4mm矩形發(fā)光二極管 |
| 文件頁(yè)數(shù)： | 39/90頁(yè) |
| 文件大小： | 318K |
| 代理商： | MT312T-Y |
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QPSK Demodulator
MT312
39
The Viterbi decoder will search for a signal with the code rates selected by this register. If one code rate is
selected, the MT312 will search for a signal with only that code rate. If the code rate is unknown then all B5:0
may be set, when the MT312 will search all code rates. It is possible to choose the starting point for the code
rate search by setting a bit in VIT SETUP[B3:1] register (86). After searching for a signal with the initial code
rate, if no signal is found the search proceeds to the next higher code rate, see 69.
In the DSS mode the code rate is not speci
fi
ed using VIT MODE register. If any of the two DSS bits of
Con
fi
guration Register (127) is set, then the code rates selected by the VIT MODE register are ignored. The
DSS code rate selection is carried out as described in section 1.1, see 10.
The result of the search is reported in the FEC STAT register (6), see 49.
6.1.3 QPSK Control. Register 26 (R/W)
B7:
Reserved
Must be set low.
B6:
Q IQ SP
Swap I and Q inputs before QPSK demodulation to overcome spectral inversion
caused by the receiver front-end, for example through the swapping I and Q wires on
the board.
High = I-Q swap
Low = No I-Q swap
B5:
Reserved
Must be set low.Q MANHigh = QPSK manual programming
B4:
Reserved
Must be set low.OP CALHigh = Output calculation disable
B3:
Reserved
Must be set low.FLD LKHigh = Use Frequency Lock Detector lock
B2:
AFC M
High = Use AFC mode, for low Symbol rates only, < 10MSym/s.
B1:
Reserved
Must be set low.
B0:
ROLL 20
High = Roll-off 0.20
Low = Roll-off 0.35
If any of the two DSS control bits of the Con
fi
guration Register (127) is active (see section 1.1 10), then bit B0
(ROLL 20) is ignored and the matched
fi
lter root-raised-cosine roll-off factor is taken as 0.20. Hence bit only
allows the choice of roll-off in the DVB mode.
NAME
ADR
B7
B6
B5
B4
B3
B2
B1
B0
Def
hex
QPSK
CTRL
26
Reserved
Q
IQ SP
Reserved Reserved Reserved AFC
M
Reserved ROLL
20
R/W
00
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| MT3371BNR | Wide Dynamic Range DTMF Receiver |
| MT3371BSR1 | Wide Dynamic Range DTMF Receiver |
| MT3371BSR | Wide Dynamic Range DTMF Receiver |
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| MT3133-Y | 制造商:MARKTECH 制造商全稱:Marktech Corporate 功能描述:Standard 10mm LED Lamps |
| MT3146-Y | 制造商:MARKTECH 制造商全稱:Marktech Corporate 功能描述:1X5 RECTANGULAR LED LAMPS |
| MT3149 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:六路閃燈IC，可選外圍元件改閃燈變順序及狀態(tài)。 |
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