GS2978CNE3 GENNUM, GS2978CNE3 Datasheet - Page 8

• 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

4. Detailed Description
4.1 Input Interfacing
4.2 Output Interfacing
DDI/DDI are high impedance differential inputs. The equivalent input circuit is shown
in
Several conditions must be observed when interfacing to these inputs:
•
•
•
The GS2978 inputs are self-biased, allowing for simple AC coupling to the device.
For serial digital video, a minimum capacitor value of 4.7µF should be used to allow
coupling of pathological test signals. A tantalum capacitor is recommended.
SD/HD Input Pin
The GS2978 SDO rise and fall times can be set to comply with both SMPTE
259M/344M and SMPTE 424M / SMPTE 292M. For all SMPTE 259M standards,
or any data rate that requires longer rise and fall time characteristics, the SD/HD
pin must be set HIGH by the application layer. For SMPTE 424M and SMPTE
292M standards and signals which require faster rise and fall times, this pin should
be set LOW.
The GS2978 outputs are current mode, and will drive typically 800mV into a 75Ω
load. These outputs are protected from accidental static damage with internal ESD
protection diodes.
In order for a DDI output circuit using the GS2978 to meet this specification, the
output application circuit shown in
recommended.
The value of L
5.6nH. A 4.7µF capacitor is used for AC coupling the output of the device. This
value is chosen to ensure that pathological signals can be coupled without a
significant DC component occurring. Please see
page 10
37186 - 5
Figure
The differential input signal amplitude must be between 100 and 2200mVpp.
The common mode voltage range must be as specified in the
Characteristics on page
For input trace lengths longer than approximately 1cm, the inputs should be
terminated as shown in the Typical Application Circuit.
for more details.
3-1.
October 2007
COMP
will vary depending on the PCB layout, with a typical value of
4.
Typical Application Circuit on page 10
Application Information on
GS2978 Data Sheet
DC Electrical
is
8 of 14