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PDF GS1504 Data sheet ( Hoja de datos )

Número de pieza GS1504
Descripción HDTV Adaptive Equalizer
Fabricantes ETC 
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HD-LINX GS1504
HDTV Adaptive Equalizer
FEATURES
• SMPTE 292M compliant
• Automatic, adjustment free cable equalization for
1.485Gb/s HDTV signals
• Differential serial outputs capable of driving 50loads
• Typically equalizes 100m of Belden 8281 or 150m of
Belden 1694 high quality co-axial cable
• Cable Length Indication
• Output Mute
• Maximum Cable Length Adjust
• Low power
• Minimal external components
• Single +5V or -5V power supply operation
APPLICATIONS
1.485Gb/s HDTV Serial Digital Receiver Interfaces for
Routers, Distribution Amplifiers, Switchers, and other
receiving equipment.
DESCRIPTION
PRELIMINARY DATA SHEET
The GS1504 is a high performance cable equalizer
designed to equalize HDTV component signal conforming
to SMPTE 292M. The adaptive cable equalizer is capable of
equalizing up to 100m of Belden 8281 co-axial cable.
The GS1504 features DC restoration for immunity to the DC
content in pathological test patterns. The device also
incorporates a Cable Length Indicator signal that provides
an indication of the amount of cable being equalized.
A voltage programmable mute threshold (MCLADJ) is
included to allow muting of the GS1504 output when a
selected cable length is reached. This feature allows the
GS1504 to distinguish between low amplitude HD SDI
signals and noise at the input of the device. The CD/Mute
pin provides an indication of the GS1504 mute status in
addition to functioning as a mute control input. The output
of the GS1504 may be forced to an active or a mute
condition by applying a voltage to the CD/Mute pin.
The GS1504 is a low power device that operates from a
single 5V power supply. The GS1504 is packaged in a
16 pin narrow SOIC and does not need external pull-up
resistors.
ORDERING INFORMATION
PART NUMBER
PACKAGE
GS1504-CKD
16 pin narrow SOIC
GS1504-CTD
16 pin Tape and Reel
TEMPERATURE
0°C to 70°C
0°C to 70°C
MCLADJ
SDI
SDI
CABLE LENGTH INDICATOR/ADJUSTOR
CARRIER DETECT
MUTE
EQUALIZER
DC
RESTORE
OUTPUT
CLI
CD/MUTE
SDO
SDO
AGC
PATENT PENDING
BLOCK DIAGRAM
Revision Date: March 2000
Document No. 522 - 05 - 02
GENNUM CORPORATION P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3
Tel. +1 (905) 632-2996 Fax. +1 (905) 632-5946 E-mail: [email protected]
www.gennum.com

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GS1504 pdf
TYPICAL PERFORMANCE CURVES (unless otherwise shown, VCC = 5V, TA = 25°C)
350
300
250
200
150 MCLADJ
MCLADJ
100
50
0
0 20 40 60
TEMPERATURE (˚C)
Fig. 7 Power Consumption
80
Uncompensated
MCLADJ
Temperature Compensated
MCLADJ
Fig. 10 Temperature Compensation of MCLADJ
800
700
600
500
400
300
200
100
0
0 50 100 150 200
CABLE LENGTH (m)
Fig. 8 Typical Peak to Peak Jitter, PRN 223-1, Belden 1694A
102
100
98
96
94
92
90
88
86
84
0
Compensated
Uncompensated
20 40 60
TEMPERATURE (˚C)
80
Fig. 11 Typical 1694A Cable Length vs. Temperature
800
700
600
500
400
300
200
100
0
0
50 100 150
CABLE LENGTH (m)
200
Fig. 9 Typical Peak to Peak Jitter, PRN 223-1, Belden 8281
90
80
70
60
50
40
30
20
10
0
0 50 100 150 200
CABLE LENGTH (m)
Fig. 12 MCLADJ Input Voltage vs 1694A Cable Length
5
522 - 05 - 02

5 Page





GS1504 arduino
GS1504 / GS1508 INTERFACING
Figures 30 through 34 show the artwork for a four layer
printed circuit evaluation board for the GS1504. The
schematic is shown in Fig 29. An FR-4 dielectric can be
used, however, controlled impedance transmission lines are
required for PCB traces longer than approximately 1cm.
Note the following PCB artwork features used to optimize
performance:
PCB trace width for HD rate signals is closely matched
to SMT component width to minimize reflections due to
change in trace impedance.
The PCB ground plane is removed under the
GS1504/GS1508 input components to minimize
parasitic capacitance.
The PCB ground plane is removed under the
GS1504/GS1508 output components to minimize
parasitic capacitance.
High speed traces are curved to minimize impedance
changes.
A picture of the GS1504/08 PCB assembly is shown in
Figure 34.
TP1
VCC
VCC
C1
C2
100n
C3
1n
TP2
GND
TP3
VCC CLI
J2
VIDEO IN
R16
L4 10n 75
R1
75
R15
37.5
C6
10n
C7
47p
C8
47p
C5
10n
1 CLI
2 VCC
3 VEE
4 SDI
5 SDI
6 VEE
7 MCLADJ
8 nc
CD/MUTE 16
VCC 15
VEE 14
SDO 13
SDO 12
VEE 11
nc 10
nc 9
2
J3
1
VCC
R4
2k
R8
75
J1 CLOSE
TO
VCC MUTE
C20
10n
C4
10n VCC
C16
1n
R7
75
R11
53.6
VCC
R8
75
U2
1 SDI SDO 8
2 SDI SDO 7
3
4
VEE GND
RSET VCC
6
5
C15
10n
C10
100n
R7
75
VCC
GS1508
L2 12n
R9
75
C17
1p
C18
1p
R10
75
L3 12n
C11 4µ7
J4
SDO
EDGEMNT_BNC
C12 4µ7
J5
SDO
EDGEMNT_BNC
C11 AND C12 ARE
TC3216 TANTALUM
CAPACITORS.
R5
10k
R6
15k
Fig. 29 GS1504/08 Evaluation Board Assembly
All resistors in ohms,
all capacitors in farads,
unless otherwise shown.
11
522 - 05 - 02

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