- 您现在的位置：买卖IC网 > PDF目录223860 > GS1515 (Electronic Theatre Controls, Inc.) HDTV Serial Digital Reclocker PDF资料下载
参数资料
| 型号： | GS1515 |
| 厂商： | Electronic Theatre Controls, Inc. |
| 英文描述： | HDTV Serial Digital Reclocker |
| 中文描述： | 高清晰度电视串行数字时钟恢复器 |
| 文件页数： | 5/17页 |
| 文件大小： | 336K |
| 代理商： | GS1515 |
522 - 23 - 01
13
G
S
1
515
JITTER DEMODULATION (DM)
The differential jitter demodulation (DM) signal is available
at the DM and DM pins. This signal is the phase correction
signal of the PLL loop, which is amplified and buffered. If
the input jitter is modulated, the PLL tracks the jitter if it is
within loop bandwidth. To track the input jitter, the VCO has
to be adjusted by the phase detector via the charge pump.
Thus, the signal which controls the VCO contains the
information
of
the
input
jitter
modulation.
The
jitter
demodulation signal is only valid if the input jitter is less
than 0.5UIp-p.
The DM/DM signals have 10k
output
impedance,
which
could
be
low
pass
filtered
with
appropriate capacitors to eliminate high frequency noise.
DFT_VEE should be connected to GND to activate DM/DM
signals.
The DM signals can be used as diagnostic tools. Assume
there is an HDTV SDI source, which contains excessive
noise during the horizontal blanking because of the
transient current flowing in the power supply. In order to
discover the source of the noise, one could probe around
the source board with a low frequency oscilloscope
(Bandwidth < 20MHz) that is triggered with an appropriately
filtered DM/DM signal. The true cause of the modulation will
be synchronous and will appear as a stationary signal with
respect to the DM/DM signal.
Figure 23 shows an example of such a situation. An HDTV
SDI signal is modulated with a modulation signal causing
about 0.2UI jitter in Figure 23 (Channel 1). The GS1515
receives this signal and locks to it. Figure 23 (Channel 2)
shows the DM signal. Notice the wave shape of the DM
signal, which is synchronous to the modulating signal. The
DM/DM signal could also be used to compare the output
jitter of the HDTV signal source.
Fig. 23 Jitter Demodulation Signal
POWER SUPPLY NOISE REDUCITON
See Application Note 522-61.
TABLE 2: RSET Values for Various Output Load Conditions
RSET RESISTOR
ADMITTANCE (g) OF
THE RSET RESISTOR
(= 1/RSET RESISTOR)
OUTPUT CURRENT
TRANSMISSION LINE,
TERMINATED AT THE
END. (PULL-UP
RESISTOR AT THE
SOURCE = 75
)
TRANSMISSION LINE,
TERMINATED AT THE
END. (PULL-UP
RESISTOR AT THE
SOURCE = 50
)
500.0
0.0020
2.506mA
0.094V
0.063V
150.0
0.0067
7.896mA
0.296V
0.197V
75.0
0.0133
15.161mA
0.569V
0.379V
53.6
0.0187
20.702mA
0.776V
0.517V
52.3
0.0192
21.216mA
0.796V
0.530V
49.9
0.0200
22.032mA
0.826V
相关PDF资料 |
PDF描述 |
|---|---|
| GS1515-CQM | HDTV Serial Digital Reclocker |
| GS1515-CTM | HDTV Serial Digital Reclocker |
| GS2008HET/R7 | 2 A, 800 V, SILICON, RECTIFIER DIODE |
| GS4576S09L-25 | DDR DRAM, PBGA144 |
| GS54180RK | 1 ELEMENT, 18 uH, GENERAL PURPOSE INDUCTOR, SMD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| GS1515-CQM | 制造商:Rochester Electronics LLC 功能描述: 制造商:Gennum Corporation 功能描述: |
| GS1515-CTM | 制造商:GENNUM 制造商全称:GENNUM 功能描述:HDTV Serial Digital Reclocker |
| GS1522 | 制造商:GENNUM 制造商全称:GENNUM 功能描述:HDTV Serial Digital Serializer |
| GS1522_04 | 制造商:GENNUM 制造商全称:GENNUM 功能描述:HDTV Serial Digital Serializer |
| GS1522-CQR | 制造商:Rochester Electronics LLC 功能描述: 制造商:Gennum Corporation 功能描述: |
发布紧急采购，3分钟左右您将得到回复。