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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)： | 9/23頁 |
| 文件大?。?/td> | 194K |
| 代理商： | 935264535557 |
1999 Jul 01
17
Philips Semiconductors
Product specication
Single Chip DAVIC/DVB-RC Cable Modem
VES1848
FIGURE 6 : APPLICATION EXAMPLE 3
OOB (MAC and application data) and
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
IB (application data with a specific PID)
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
MAC
interactive
data
16
tuner
IF
fixed
DS OOB
LPF1
VAGC
or
PctrPWM
digital
command
LPF1
analog power
command
Qana
Iana
VES1848
LPF4
PBF1
IF/2
IF
FIGURE 7 : APPLICATION EXAMPLE 4
MPEG
demux
broadcast
OnOff
interactive
application layers
micro-processor
MAC
16
or
PctrPWM
digital
command
LPF1
analog power
command
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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