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GS1528 View Datasheet(PDF) - Gennum -> Semtech

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GS1528 Datasheet PDF : 13 Pages
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4. Application Information
4.1 PCB Layout
Special attention must be paid to component layout when designing serial digital
interfaces for HDTV. 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:
• The PCB trace width for HD rate signals is closely matched to SMT component
width to minimize reflections due to changes in trace impedance
• The PCB groundplane is removed under the GS1528 output components to
minimize parasitic capacitance
• The PCB ground plane is removed under the GS1528 RSET pin and resistor to
minimize parasitic capacitance
• Input and output BNC connectors are surface-mounted in-line to eliminate
transmission line stubs caused by a BNC mounting via high-speed traces, which are
curved to minimize impedance variations due to change of PCB trace width
4.2 Typical Application Circuit
DIFFERENTIAL
DATA INPUT
4u7
49.9
10n
49.9
1
2 SDI
3 SDI
VEE
GS1528
8
SDO
7
SDO
6
SD/HD
4u7
VCC
4
5
VCC
750
10n
5.6n*
75
VCC
75
75
4u7
10n
75
5.6n*
4u7
* TYPICAL VALUE VARIES WITH LAYOUT
BNC
BNC
SD/HD
NOTE: All resistors in Ohms, capacitors in Farads,
and inductors in Henrys, unless otherwise noted.
Figure 4-1: GS1528 Typical Application Circuit
GS1528 HD-LINX II Multi-Rate SDI Dual Slew-Rate
Cable Driver
Data Sheet
16632 - 9
August 2010
11 of 13
 

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