GS2964 Datasheet, PDF (13/17 Pages) Gennum Corporation – SMPTE 424M, SMPTE 292M and SMPTE 259M compliant

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