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GS2964 Datasheet, PDF (13/17 Pages) Gennum Corporation – SMPTE 424M, SMPTE 292M and SMPTE 259M compliant | |||
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5. Application Information
5.1 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:
⢠PCB trace width for 3Gb/s 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 GS2964 input components to minimize
parasitic capacitance.
⢠The PCB ground plane is removed under the GS2964 output components to
minimize parasitic capacitance.
⢠High speed traces are curved to minimize impedance changes.
5.2 Typical Application Circuit
CD
MUTE
VCC
VCC
SDI
6.2n*
75
10n
1u
1u
16 15 14 13
10n
1
VEE_A
VEE_D 12
2
SDI
3
SDI
GS2964
11
SDO
10
SDO
75
37R4
4
NC
9
NC
4u7
+
+
4u7
5
6
7
8
470n
470n
SQ_ADJ
BYPASS
SDO
SDO
NOTE: All resistors in Ohms, capacitors in Farads,
and inductors in Henrys, unless otherwise noted.
* Value dependent on layout
Figure 5-1: GS2964 Typical Application Circuit
GS2964 Adaptive Cable Equalizer
Data Sheet
51913 - 3
March 2010
13 of 17
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