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參數(shù)資料
| 型號： | 935264535557 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | SPECIALTY TELECOM CIRCUIT, PQFP208 |
| 封裝： | SOT-316, MQFP-208 |
| 文件頁數(shù)： | 8/23頁 |
| 文件大?。?/td> | 194K |
| 代理商： | 935264535557 |
1999 Jul 01
16
Philips Semiconductors
Product specication
Single Chip DAVIC/DVB-RC Cable Modem
VES1848
FIGURE 4 : APPLICATION EXAMPLE 1
tuner
IF
fixed
VES1820
(QAM demod
+FEC)
MPEG
demux
broadcast
MPEG2-TS
LPF1
I2C
OnOff
interactive
application layers
micro-processor
MAC
interactive
data
8
16
symbol
clock
or
PctrPWM
digital
command
LPF1
analog power
command
Qana
Iana
VES1848
LPF3
MAC data
diplexer
cable
+ DS IB
broadcast
only IB DS with a specific PID for
direct IF synthesys between 5 and 46MHz
2 micro-processors interface
interactive application MPEG2-TS packets,
BB_IF(AD.2)=1, DStype(88.[7-6])=0, IB_ATM(83.6)=0, InExt(88.1)=0, utopia(pin33)=0, nb_micro(pin36)=0
FIGURE 5 : APPLICATION EXAMPLE 2
diplexer
splitter
tuner
IF
fixed
VES1820
(QAM demod
+FEC)
MPEG
demux
cable
broadcast
MPEG2-TS
LPF1
I2C
OnOff
interactive
application layers
micro-processor
MAC
8
16
tuner
IF
fixed
DS OOB
LPF1
VAGC
or
PctrPWM
digital
command
LPF1
analog power
command
Qana
Iana
VES1848
broadcast
modulator
LPF2
only OOB DS
2 micro-processors interface
base band outputs US
If the frequency range achieved by the direct IF synthesys (5 to 46 MHz) is not convenient,
BB_IF(AD.2)=0, DStype(88.[7-6])=1 or 2, InExt(88.1)=0, utopia(pin33)=0, nb_micro(pin36)=0
an external modulator can be used. It is controled by the MAC micro-processor to set the desired IF.
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