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GS1679-INTE3Z Arkusz danych(PDF) 8 Page - Gennum Corporation |
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GS1679-INTE3Z Arkusz danych(HTML) 8 Page - Gennum Corporation |
8 / 16 page GS1679 Cable Driver with HD/SD Capability Data Sheet 54175 - 1 March 2011 8 of 16 3.3 Output Disable The GS1679 supports an output disable function for each serial digital differential output. Control of this function is determined by the setting of the DISABLE1 and DISABLE2 control pins. The serial output disables (DISABLE1 and DISABLE2), disable power to the current mode serial digital output drivers. When asserted LOW, the SDO/SDO output drivers are powered-down. When DISABLE1 and DISABLE2 are driven LOW simultaneously, the entire device is powered down, and the power consumption is minimized. 3.4 Output Amplitude (RSET) The output amplitude of the GS1679 can be adjusted by changing the value of the RSET resistor as shown in Figure 3-2. For an 800mVp-p output with a nominal ±7% tolerance, a value of 750Ω is required. A ±1% SMT resistor should be used. The RSET resistor is part of the GS1679’s high-speed output circuit. The resistor should be placed as close as possible to the RSET pin, and be connected directly to the VCC plane (traces/wires may cause instability). In addition, the PCB capacitance should be minimized at this node by removing the PCB groundplane beneath the RSET resistor and the RSET pin. NOTE: Care should be taken when considering layout of the RSET resistor. Please refer to Section 4.1 for more details. Table 3-1: Slew Rate Selection SD/HD Rise/Fall Time 0 292M compliant 1 SMPTE 259M compliant FloatingSMPTE 259M compliant Table 3-2: Output Disable DISABLE1 DISABLE2 SDO1/SDO1 SDO2/SDO2 0 0 or Floating All Chip Power Down 01 High-Impedance Operational 1 or Floating 0 or Floating Operational High-Impedance 1 or Floating 1 Operational Operational Floating Floating Operational High-Impedance |
Podobny numer części - GS1679-INTE3Z |
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Podobny opis - GS1679-INTE3Z |
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