GS9077 데이터 시트보기 (PDF) - Gennum -> Semtech
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GS9077 Datasheet PDF : 14 Pages
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4. Detailed Description
GS9077 Data Sheet
4.1 Input Interfacing
DDI/DDI are high impedance differential inputs. The equivalent input circuit is shown
in Figure 3-1.
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 DC Electrical
Characteristics on page 4.
• For input trace lengths longer than approximately 1cm, the inputs should be
terminated as shown in the Typical Application Circuit.
The GS9077 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.
4.2 Output Interfacing
The GS9077 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 GS9077 to meet this specification, the
output application circuit shown in Typical Application Circuit on page 10 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 10 for more details.
44619 - 0 May 2007
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