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參數(shù)資料
| 型號(hào)： | GS9025A |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Serial Digital Receiver |
| 中文描述： | 串行數(shù)字接收機(jī) |
| 文件頁(yè)數(shù)： | 9/18頁(yè) |
| 文件大?。?/td> | 192K |
| 代理商： | GS9025A |
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GENNUM CORPORATION
522 - 75 - 00
9
G
Fig. 14 Typical Input Jitter Tolerance (Characterized)
Fig. 15 Typical IJT vs. Temperature (V
CC
= 5.0V) (Characterized)
DETAILED DESCRIPTION
The GS9025A Serial Digital Receiver is a bipolar integrated
circuit containing a built-in cable equalizer and reclocker.
Serial digital signals are applied to either the analog
SDI/SDI or digital DDI/DDI inputs. Signals applied to the
SDI/SDI inputs are equalized and then passed to a
multiplexer. Signals applied to the DDI/DDI inputs bypass
the equalizer and go directly to the multiplexer. The
analog/digital select pin (A/D) determines which signal is
then passed to the reclocker.
Packaged in a 44 pin MQFP, the receiver operates from a
single 5V supply to data rates of 540Mb/s. Typical power
consumption is 575mW.
1. CABLE EQUALIZER
The automatic cable equalizer is designed to equalize
serial digital data signals from 143Mb/s to 540Mb/s.
The serial data signal is connected to the input pins
(SDI/SDI) either differentially or single-ended. The input
signal passes through a variable gain equalizing stage
whose frequency response closely matches the inverse
cable loss characteristic. In addition, the variation of the
frequency response with control voltage imitates the
variation of the inverse cable loss characteristic with cable
length. The gain stage provides up to 40dB of gain at
200MHz which typically results in equalization of greater
than 350m at 270Mb/s of Belden 8281 cable.
The edge energy of the equalized signal is monitored by a
detector
circuit
which
produces
corresponding to the difference between the desired edge
energy and the actual edge energy. This error signal is
integrated by an external differential AGC filter capacitor
(AGC+/AGC-) providing a steady control voltage for the
gain stage. As the frequency response of the gain stage is
automatically varied by the application of negative
feedback, the edge energy of the equalized signal is kept
at a constant level which is representative of the original
edge energy at the transmitter.
an
error
signal
The equalized signal is also DC restored, effectively
restoring the logic threshold of the equalized signal to its
corrective level irrespective of shifts due to AC coupling.
1-1. Signal Strength Indication/carrier Detect
The GS9025A incorporates an analog signal strength
indicator/carrier detect (SSI/CD) output indicating both the
presence of a carrier and the amount of equalization
applied to the signal. The voltage output of this pin versus
cable length (signal strength) is shown in Figure 2 and
Figure 16.
With 0m of cable (800mV input signal levels), the SSI/CD
output voltage is approximately 4.5V. As the cable length
increases, the SSI/CD voltage decreases linearly providing
accurate correlation between the SSI/CD voltage and cable
length.
Fig. 16 SSI/CD Voltage vs. Cable Length
When the signal strength decreases to the level set at the
"Carrier Detect Threshold Adjust" pin, the SSI/CD voltage
goes to a logic "0" state (0.8 V) and can be used to drive
0
0.1
0.2
0.3
0.4
0.5
0.6
100
200
300
400
500
600
DATA RATE (Mb/s)
T
A
= 0 to 70
C, V
CC
= 4.75 to 5.25V
I
0.200
0.250
0.300
0.350
0.400
0.450
0.500
0.550
0.600
0
10
20
30
40
50
60
70
TEMPERATURE (C
)
I
143Mb/s
177Mb/s
270Mb/s
360Mb/s
540Mb/s
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| GS9025ACQM | Serial Digital Receiver |
| GS9025ACTM | Serial Digital Receiver |
| GS9028 | Cable Driver with Two Adjustable Outputs |
| GS9028-CKA | Cable Driver with Two Adjustable Outputs |
| GS9028-CTA | Cable Driver with Two Adjustable Outputs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| GS9025A_05 | 制造商:GENNUM 制造商全稱:GENNUM 功能描述:Serial Digital Receiver |
| GS9025ACQM | 制造商:Rochester Electronics LLC 功能描述: 制造商:Gennum Corporation 功能描述: |
| GS9025ACQME3 | 制造商:Semtech Corporation 功能描述:Cable Equalization 44-Pin MQFP Tray 制造商:Semtech Corporation 功能描述:GS9025 Series 540 Mb/s Cable Equalization Serial Digital Receiver - MQFP-44 制造商:Semtech Corporation 功能描述:Receiver |
| GS9025ACTM | 制造商:GENNUM 制造商全稱:GENNUM 功能描述:Serial Digital Receiver |
| GS9025ACTME3 | 制造商:Semtech Corporation 功能描述:Receiver |
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