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參數(shù)資料
| 型號： | GS9024-CTB |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Automatic Cable Equalizer |
| 中文描述： | 自動電纜均衡器 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大小： | 148K |
| 代理商： | GS9024-CTB |
GENNUM CORPORATION
521 - 70 - 06
7
G
Fig. 11
3. CARRIER DETECT THRESHOLD ADJUST
The threshold level at which loss of carrier is detected is
adjustable via external resistors at the CD_ADJ pin. The
control voltage at the CD_ADJ pin is set by a simple resistor
divider circuit. The threshold level is adjustable from 200m
to 350m. By default (no external resistors), the threshold is
typically 320m. Connecting this pin to Ground disables the
SDO/SDO muting function and allows for maximum
possible cable length equalization.
This feature is designed for use in applications such as
routers where signal crosstalk and circuit noise cause the
equalizer to output erroneous data when no input signal is
present. This problem is not solved by using a Carrier
Detect function with a fixed internal reference because the
signal to noise ratio on the circuit board may be significantly
less than the default signal detection level set by the on-
chip reference. To solve this problem, the GS9024 provides
a user adjustable threshold to meet the unique conditions
that exist in each user's application. Override and internal
default settings are provided to give the user total flexibility.
4. OUTPUT EYE MONITOR
The GS9024 provides an 'Output Eye Monitor' (OEM) which
allows the verification of signal integrity after equalization,
prior to reslicing. The OEM pin is an open collector current
output that requires an external 50
pullup resistor. When
the pullup resistor is not used, the OEM block is disabled
and the internal OEM circuit is powered down. The OEM
provides a 0.25Vp-p signal when driving a 5
0
oscilloscope input.
5. I/O DESCRIPTION
5.1. High Speed Analog Inputs (SDI/SDI)
SDI/SDI are high impedance inputs which accept
differential or single-ended input drive.
Figure 12 shows the recommended interface when a single-
ended serial digital signal is used.
Fig. 12
5.2. High Speed Outputs (SDO/SDO)
SDO/SDO are current mode outputs that require external
pullups (see Figure 13). The output signal swings are
800mV when 75
resistors are used. A diode can be
placed between V
CC
and the pullups to shift the signal
levels down by approximately 0.7 volts. When the output
traces are longer than 1 inch, controlled impedance traces
should be used. The pullup resistors should be placed at
the end of the output traces as they terminate the trace in
its characteristic impedance (75
).
Fig. 13
0
1
2
3
4
5
50
100
150
200
250
300
350
400
450
500
S
CABLE LENGTH (m)
0
CD_ADJ
CONTROL RANGE
SDI
GS9024
SDI
75
37.5
75
10nF
10nF
75
SDO
SDO
GS9024
75
75
V
CC
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| GS9024-CTBE3 | 制造商:Gennum Corporation 功能描述:Automatic Cable Equalizer 14-Pin SOIC T/R |
| GS9025 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:GENLINX II Serial Digital Receiver |
| GS9025 44PQFP | 制造商:Gennum Corporation 功能描述: |
| GS9025A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Serial Digital Receiver |
| GS9025A_05 | 制造商:GENNUM 制造商全稱:GENNUM 功能描述:Serial Digital Receiver |
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