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GS1508 データシート(PDF) 5 Page - Gennum Corporation

部品番号 GS1508
部品情報  HDTV Cable Driver
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メーカー  GENNUM [Gennum Corporation]
ホームページ  http://www.gennum.com
Logo GENNUM - Gennum Corporation

GS1508 データシート(HTML) 5 Page - Gennum Corporation

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GS1508 HD-LINX™ HDTV Cable Driver
Data Sheet
9500 - 6
August 2010
5 of 14
3. Detailed Description
3.1 Input Interfacing
SDI/SDI are high-impedance differential inputs (see Figure 4-1 for equivalent input
circuit).
Several conditions must be observed when interfacing to these inputs:
1. The differential input signal amplitude must be between 150 and 800mVpp.
2. The common mode voltage range must be as specified in the DC Electrical
Characteristics table. For a 400mV input from the GS1504 HD cable equalizer, this
corresponds to a common mode voltage range of between 2.7V and 4.8V.
3. For input trace lengths longer than approximately 1cm, the inputs should be
terminated as shown in the Typical Application Circuit.
The GS1508 inputs are self biased, allowing for simple AC-coupling to the device. For
serial digital HDTV, a minimum capacitor value of 4.7μF should be used to allow
coupling of pathological test signals. A tantalum capacitor is recommended.
3.2 Output Interfacing
The GS1508 outputs are current-mode, and will drive 800mV into a 75Ω load. These
outputs are protected from accidental static damage with internal static protection
diodes.
The SMPTE 292M standard requires 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 an HD SDI output circuit using the GS1508 to meet this specification, the
output circuit shown in the Typical Application Circuit is recommended.
The values of LCOMP and CCOMP will vary depending on PCB layout, but typical values are
12nH and 0.5pF respectively. The small value of CCOMP can be easily swamped by
parasitic PCB capacitance, so it is recommended that the ground plane be removed
under the GS1508 output circuitry (see the Application Information section in this data
sheet for further details). A 4.7μF capacitor is used for AC-coupling the output of the
GS1508. This value is chosen to ensure that pathological signals can be coupled without
a significant DC component occurring.


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