參數(shù)資料
型號(hào)： 935264530157
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP100
封裝： SOT-317, MQFP-100
文件頁(yè)數(shù)： 28/43頁(yè)
文件大?。?/td> 254K
代理商： 935264530157
1999 March 01
34
Philips Semiconductors
Product specication
Single chip DVB-C channel receiver
VES1820X
FRAME SYNCHRONIZATION
Frame synchronization is performed at the output of the demodulator to both synchronize the Forney convolutional
de-interleaver and to determine the boundaries of the Reed-Solomon blocks.
MPEG2 transport packets consist of 204 bytes: one sync byte (as the first byte of the packet), 187 data bytes, and
16 redundancy bytes. The sync byte is used in frame synchronization.
The frame synchronization state machine operates in two phases:
Acquisition Phase. When
α consecutive sync bytes (or sync bytes) are detected, the output signal FSYNC
goes high and the state machine switches to the Tracking Phase.
Tracking Phase. When
β consecutive sync bytes (or sync bytes) are missed, the output signal FSYNC
goes low and the state machine switches back to the Acquisition Phase.
(See FIGURE 16 page 35 for details of the state machine operation).
The parameters
α and β are programmable via the I2C interface. The following table shows the value of the
parameters as a function of C[1:0]:
C[1]
C[0]
ab
0
1
5
6
8
1
0
1
6
10
15
PERFORMANCE
The following table shows an example of frame synchronization algorithm performance. Computed values for
maximum average re-frame time (TRF), the meanframe misalignment time (TMF) and the probability of false
alignment (PF) are given as a function of the BER at the output of the demodulator output in the case of :
α = 5 and β = 8.
BER
Acquisition
(
α = 5)
Procedure
Tracking
Proce-
dure(
β = 8)
5X10
-2
TRF(fra-
mes)
69 .95
PF
1.15X10
-8
TMF(fra-
mes)
9.15X10
3
10-2
5X10
-3
10-3
5X10
-4
15 .97
13 .47
2.22X10-9
1.81X10
-9
11 .78
11 .59
1.54X10-9
1.51X10
-9
8.54X108
1.83X10
11
6.18X1016
1.15X10
19
相關(guān)PDF資料
PDF描述
935264533557 SPECIALTY CONSUMER CIRCUIT, PQFP100
935264539557 SPECIALTY CONSUMER CIRCUIT, PQFP100
935266871557 SPECIALTY CONSUMER CIRCUIT, PBGA292
935266917557 SPECIALTY CONSUMER CIRCUIT, PBGA292
935268386557 SPECIALTY CONSUMER CIRCUIT, PBGA292
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
935267356112 制造商:NXP Semiconductors 功能描述:IC TEA1507PN
935268081112 制造商:NXP Semiconductors 功能描述:SUB ONLY IC
935268721125 制造商:NXP Semiconductors 功能描述:Buffer/Line Driver 1-CH Non-Inverting 3-ST CMOS 5-Pin TSSOP T/R
935269304128 制造商:ST-Ericsson 功能描述:IC AUDIO CODEC W/TCH SCRN 48LQFP
935269544557 制造商:NXP Semiconductors 功能描述:SUB ONLY TDA9587-2US1-V1.3
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*