GS2978CNE3 GENNUM, GS2978CNE3 Datasheet - Page 10

• Manufacturer Part Number: GS2978CNE3
• Description: IC SLEW RATE CABLE DRIVER 2.97GBPS QFN16
• Manufacturer: GENNUM

Specifications of GS2978CNE3

• Supply Voltage Range: 3.135V To 3.465V
• Operating Temperature Range: 0°C To +70°C
• Digital Ic Case Style: QFN
• No. Of Pins: 16
• Termination Type: SMD
• Control Interface: Serial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

5. Application Information
5.1 PCB Layout
5.2 Typical Application Circuit
DIFFERENTIAL
DATA INPUT
NOTE: All resistors in Ohms, capacitors in Farads,
and inductors in Henrys, unless otherwise noted.
10n
4u7
4u7
DISABLE
SD/HD
49.9
49.9
VCC
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:
•
•
•
•
Figure 5-1: Typical Application Circuit
37186 - 5
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 ground plane is removed under the GS2978 output components to
minimize parasitic capacitance.
The PCB ground plane is removed under the GS2978 R
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 which
are curved to minimize impedance variations due to change of PCB trace
width.
750
October 2007
4
6
1
2
3
DDI
DDI
VEE
RSET
DISABLE
GS2978
SD/HD
SDO
SDO
VCC
VCC
10n
12
11
10
9
* TYPICAL VALUE: VARIES WITH LAYOUT
5.6n
5.6n
75
75
75
75
GS2978 Data Sheet
*
*
VCC
SET
4u7
4u7
pin and resistor to
10n
10 of 14
BNC
BNC