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GS1508-CTA Schematic ( PDF Datasheet ) - ETC

Teilenummer GS1508-CTA
Beschreibung HDTV Cable Driver
Hersteller ETC
Logo ETC Logo 




Gesamt 8 Seiten
GS1508-CTA Datasheet, Funktion
HD-LINX GS1508
HDTV Cable Driver
FEATURES
• SMPTE 292M compliant
• dual cable driving outputs optimized for driving data
up to 1.485Gb/s
• ±7% tolerance output
• >17dB output return loss
• minimum external components
• seamless interface with the HD-LINX™ family of
products
• low power
• standard packaging
APPLICATIONS
1.485Gb/s HDTV Serial Digital Receiver Interfaces for:
Routers, Distribution Amplifiers, Switchers, and other
transmitting equipment.
DESCRIPTION
PRELIMINARY DATA SHEET
The GS1508 is a first generation very high speed bipolar
integrated circuit designed to drive two 75co-axial
cables. The GS1508 is a SMPTE 292M compliant cable
driver that directly interfaces with other Gennum HDTV
devices and can also be used as a general purpose high
speed cable driver.
The GS1508 features two complementary outputs whose
amplitude is controlled within a precise ±7% variation. The
output amplitude can be varied by adjusting the RSET
resistor value.
The serial inputs can be AC coupled. The GS1508 is a low
power device that does not require external pull down
resistors. The GS1508 is packaged in an 8 pin SOIC and
operates from a single 5V power supply.
ORDERING INFORMATION
PART NUMBER
PACKAGE
GS1508-CKA
8 pin SOIC
GS1508-CTA
8 pin Tape and Reel
TEMPERATURE
0°C to 70°C
0°C to 70°C
BANDGAP REFERENCE AND BIASING CIRCUIT
RSET
SDI INPUT
DIFFERENTIAL
PAIR
SDI
PATENT PENDING
OUTPUT STAGE &
CONTROL
BLOCK DIAGRAM
SDO
SDO
Revision Date: March 2000
Document No. 522 - 02 - 03
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






GS1508-CTA Datasheet, Funktion
TYPICAL APPLICATION CIRCUIT
PECL INPUT
Z0 Z0
1n
100n
VCC
75
1
SDI
8
SDO
2
SDI
7
SDO
3 GS1508 6
VEE GND
4
RSET
5
VCC
75
VCC
CCOMP
LCOMP
75
75
LCOMP
CCOMP
4µ7
+
+
4µ7
53.6
All resistors in ohms,
0µ1 all capacitors in farads,
unless otherwise shown.
OUT
OUT
TABLE 2: Typical Application Circuit Component Values
COMPONENT VALUE
COMMENT
RSET
53.6 For 800mV Output
Z0
50
For 50PCB trace impedance
LCOMP
12nH
Typical value. Component value will vary depending on PCB layout.
CCOMP
0.5pF
Typical value. Component value will vary depending on PCB layout.
APPLICATION INFORMATION
PCB LAYOUT
Special attention must be paid to component layout when
designing serial digital interfaces for HDTV. Figures 8
through 11 show the artwork for a four layer printed circuit
evaluation board for the GS1508. The schematic is shown in
Figure 7. 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 GS1508
output components to minimize parasitic capacitance.
The PCB ground plane is removed under the GS1508 RSET
pin and resistor to minimize parasitic capacitance
Input and output BNC connectors are surface mounted in-
line to eliminate a transmission line stub caused by a BNC
mounting via High speed traces are curved to minimize
impedance changes due to change of PCB trace width.
522 - 02 - 03
6

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