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參數(shù)資料
| 型號(hào)： | GS1522 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | HDTV Serial Digital Serializer |
| 中文描述： | 高清晰度電視串行數(shù)字串行 |
| 文件頁(yè)數(shù)： | 14/20頁(yè) |
| 文件大?。?/td> | 414K |
| 代理商： | GS1522 |
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GENNUM CORPORATION
522 - 26 - 00
14
G
Fig. 21 Input Jitter Indicator (Typical at T
A
= 25
°
C)
15. JITTER DEMODULATION (DM)
The differential jitter demodulation (DM) signal is available
at the DM pin (86). 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
signal has a 10k
output impedance, which could be low
pass filtered with appropriate capacitors to eliminate high
frequency noise. DFT_V
EE
(88) should be connected to
GND to activate the DM signal.
The DM signal can be used as a diagnostic tool. 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 signal. The true cause of the modulation will be
synchronous and will appear as a stationary signal with
respect to the DM signal.
Figure 22 shows an example of such a situation. An HDTV
SDI signal is modulated with a modulation signal causing
about 0.2UI jitter in Figure 22 (Channel 1). The GS1522
receives this signal and locks to it. Figure 22 (Channel 2)
shows the DM signal. Notice the wave shape of the DM
signal, which is synchronous to the modulating signal. The
DM signal could also be used to compare the output jitter of
the HDTV signal source.
Fig. 22 Jitter Demodulation Signal
16. MUTE
The logic controls the mute block whenever the PLL_LOCK
(15) signal has a LOW logic state. Whenever the mute
signal is asserted, previous state of the output is latched.
17. CABLE DRIVER
The outputs of the GS1522 are a complimentary current
mode cable driver stages. The output swing and
impedance can be varied. Table 4
may be used to select
the R
SET
resistor for the desired output voltage level. Linear
interpolation can be used to determine the specific value of
the resistor for a given output swing at the load impedance.
For linear interpolation, either Figure 23 or the information in
Table 4 should be used. The admittance should be found
and then, by inverting the admittance, a resistor value for
the R
SET
can be found. The output can be used as dual
0.8V 75
cable drivers. It can also be used as a differential
transmission line driver. In this case, the pull-up resistor
should match the impedance of the transmission line
because the pull-up resistor acts as the source impedance.
When it is used in this case, a higher value of R
SET
resistor
could be used in order to reduce the swing and to save
power. Other HD-LINX
products can handle such low
input swings. It should be noted that the minimum R
SET
resistor cannot be less than 50
for reliability reasons
because of higher current density.
I
INPUT JITTER (UI)
0.00 0.20 0.40 0.60 0.80
5.0
4.8
4.6
4.4
4.2
4.0
3.8
3.6
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| GS1522-CQR | HDTV Serial Digital Serializer |
| GS1540 | HDTV Serial Digital Non-Equalizing Receiver |
| GS1540-CQR | HDTV Serial Digital Non-Equalizing Receiver |
| GS1545 | HDTV Serial Digital Equalizing Receiver |
| GS1545-CQR | HDTV Serial Digital Equalizing Receiver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| GS1522_04 | 制造商:GENNUM 制造商全稱: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: |
| GS1522-CQRE3 | 制造商:Gennum Corporation 功能描述:Monolithic Bipolar Integrated Circuit 128-Pin MQFP |
| GS1524 | 制造商:GENNUM 制造商全稱:GENNUM 功能描述:GS1524 HD-LINX-TM II Multi-Rate SDI Adaptive Cable Equalizer |
| GS1524_11 | 制造商:GENNUM 制造商全稱:GENNUM 功能描述:Multi-Rate SDI Adaptive Cable Equalizer |
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