參數(shù)資料
型號： VES1848
英文描述： MODEM CIRCUIT|MODEM|CMOS|QFP|208PIN|PLASTIC
中文描述： 調(diào)制解調(diào)器電路|調(diào)制解調(diào)器|的CMOS | QFP封裝| 208PIN |塑料
文件頁數(shù)： 17/18頁
文件大?。?/td> 223K
代理商： VES1848
VES 1848 rev 1.2 / July 99 / p 17
FIGURE 6 : APPLICATION EXAMPLE 3
OOB (MAC and application data) and
IB (application data with a specific PID)
BB_IF(AD.2)=1, DStype(88.[7-6])=1 or 2, IB_ATM(83.6)=0, InExt(88.1)=0, utopia(pin33)=0, nb_micro(pin36)=1
IF between 5 and 65MHz
1 micro-processor interface
An other solution to get an US frequency band larger than the direct IF synthesys range is to use the
sinewave generated on Q and mixed it with the modulated signal (output on I).
The carrier frequency on I and the sinewave frequency on Q are chosen equal to IF/2.
Thus after multiplication we get one spectrum centered on the IF frequency and the second centered on 0.
diplexer
splitter
tuner
IF
fixed
VES1820
(QAM demod
+FEC)
MPEG
demux
cable
broadcast
+ DS IB
broadcast
MPEG2-TS
LPF1
I2C
OnOff
interactive
application layers
micro-processor
micro-processor
MAC
interactive
data
16
tuner
IF
fixed
DS OOB
LPF1
VAGC
or
PctrPWM
digital
command
LPF1
analog power
Qana
Iana
VES1848
LPF4
LPF4
PBF1
IF/2
IF/2
IF
FIGURE 7 : APPLICATION EXAMPLE 4
MPEG
demux
broadcast
OnOff
interactive
application layers
micro-processor
micro-processor
MAC
16
or
PctrPWM
digital
LPF1
analog power
Qana
Iana
VES1848
LPF3
diplexer
cable
EXT_SYNC
tuner
IF
fixed
VES1900
(QAM demod
+FEC)
LPF1
+ DS IB
broadcast
MPEG2-TS
MAC and application
data
I2C
(FPGA)
MCNS deframing
DS MCNS
single micro-processor interface
direct IF synthesys between 5 and 46MHz
BB_IF(AD.2)=1, InExt(88.1)=1, utopia(pin33)=0, nb_micro(pin36)=1
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