參數(shù)資料
型號(hào)： 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(yè)數(shù)： 17/23頁(yè)
文件大?。?/td> 194K
代理商： 935264535557
1999 Jul 01
3
Philips Semiconductors
Product specication
Single Chip DAVIC/DVB-RC Cable Modem
VES1848
1
GENERAL DESCRIPTION
FIGURE 1 : FUNCTIONAL BLOCK DIAGRAM
interface
application layers
interface
MAC
Up Stream
synchronisation
external
synchro
channel processing
Out Of Band
DQPSK
demodulator
ADC
IF
fixed
QPSK / 16QAM
burst modulator
DAC
Q
Up Stream
channel encoding
programmable
In Band
channel processing
symbol clock
MPEG2-TS
IF or I
1.1
ABREVIATIONS
AGC
Automatic Gain Control
BW
Bandwidth
CRC
Cyclic Redundancy Checking (type of error correction code)
DS
Down Stream (from the Headend to the set-top box)
HE
Headend
HEC
Header Error Control (CRC of the ATM cell header)
IB
In Band
IF
Intermediate Frequency
NIU
Network Interface Unit (physical and MAC layers of the STB)
OOB
Out Of Band
PWM
Pulse Wave Modulation
SL-ESF
Signalling Link Extended SuperFrame (name of the OOB frame)
STB
Set-Top Box
US
Up Stream (from the set-top box to the headend)
UW
Unique Word (=preamble)
1.2
NOTATION
References to programmation registers are done this way :
AD.7 = bit 7 (in decimal) of the register located at the address AD (in hexa).
AD.[7-5] = bits 7 down to 5 of the register located at the address AD.
1.3
FUNCTIONAL DESCRIPTION
ADC
The VES 1848 implements a 7-bit analog to digital converter. It directly samples the OOB IF signal. The IF value
can be chosen by the system designer.
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