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GS1528B Datasheet(PDF) 8 Page - Gennum Corporation

Part # GS1528B
Description  HD-LINX II Multi-Rate Dual Slew-Rate Cable Driver
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Manufacturer  GENNUM [Gennum Corporation]
Direct Link  http://www.gennum.com
Logo GENNUM - Gennum Corporation

GS1528B Datasheet(HTML) 8 Page - Gennum Corporation

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GS1528B HD-LINX® II Multi-Rate Dual Slew-Rate Cable
Driver
Data Sheet
39623 - 4
August 2010
8 of 14
5. Detailed Description
5.1 Input Interfacing
DDI/DDI are high impedance differential inputs. The equivalent input circuit is shown in
Figure 4-1.
Several conditions must be observed when interfacing to these inputs:
• The differential input signal amplitude must be between 300 and 2200mVpp.
• The common mode voltage range must be as specified in the Table 2.2.
• For input trace lengths longer than approximately 1cm, the inputs should be
terminated as shown in the Typical Application Circuit.
The GS1528B 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 GS1528B SDO rise and fall times can be set to comply with both SMPTE 259M/344M
and 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 292M standards and signals which require faster rise and fall times,
this pin should be set LOW.
5.2 Output Interfacing
The GS1528B outputs are current mode, and will drive 800mV into a 75Ω load. These
outputs are protected from accidental static damage with internal ESD protection
diodes.
The SMPTE 292M, SMPTE 344M and SMPTE 259M standards require that the output of a
cable driver have a source impedance of 75Ω and a return loss of at least 15dB between
5MHz and 1.485GHz.
In order for a DDI output circuit using the GS1528B to meet this specification, the output
application circuit shown in the Typical Application Circuit on page 11 is
recommended.
The value of LCOMP will vary depending on the PCB layout, with a typical value of 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 Application Information on page 11 for more details.


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