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GS1528BCTAE3 Arkusz danych(PDF) 8 Page - Gennum Corporation |
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GS1528BCTAE3 Arkusz danych(HTML) 8 Page - Gennum Corporation |
8 / 14 page 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. |
Podobny numer części - GS1528BCTAE3 |
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Podobny opis - GS1528BCTAE3 |
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