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GS2978-CTE3 Scheda tecnica(PDF) 8 Page - Gennum Corporation |
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GS2978-CTE3 Scheda tecnica(HTML) 8 Page - Gennum Corporation |
8 / 15 page GS2978 HD-LINX® III Multi-Rate Dual Slew-Rate Cable Driver Data Sheet 37186 - 7 March 2009 8 of 15 4. Detailed Description 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 100 and 2200mVpp. • The common mode voltage range must be as specified in the DC Electrical Characteristics on page 5. • For input trace lengths longer than approximately 1cm, the inputs should be terminated as shown in the Typical Application Circuit. 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. 4.2 Output Interfacing 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 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. |
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