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GS2962 Datasheet(PDF) 28 Page - Semtech Corporation |
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GS2962 Datasheet(HTML) 28 Page - Semtech Corporation |
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28 / 82 page  GS2962 3G/HD/SD-SDI Serializer with Complete SMPTE Video Support Data Sheet 48005 - 7 October 2010 28 of 82 The GS2962 is a high performance 3Gb/s capable transmitter. In order to optimize the output jitter performance across all operating conditions, input levels and overshoot at the parallel video data inputs of the device need to be controlled. In order to do this, source series termination resistors should be used to match the impedance of the PCB data trace line. IBIS models can be used to simulate the board effects and then optimize the output drive strength and the termination resistors to allow for the best transition (one that produces minimal overshoot). If this is not viable, Gennum recommends matching the source series resistance to the trace impedance, and then adjusting the output drive strength to the minimum value that will give zero errors. The above also applies to the PCLK input line. HVF should also be well terminated, however due to the lower data rates and transition density, it is not as critical. 4.2.1 Parallel Input in SMPTE Mode When the device is operating in SMPTE mode (SMPTE_BYPASS = HIGH), data must be presented to the input bus in either multiplexed or demultiplexed form, depending on the setting of the 20BIT/10BIT pin. 20-bit demultiplexed HD format HIGHLOW LOW HIGHLOW Chroma Luma 20-bit data Input HD format HIGH LOW LOW LOW LOW DATA DATA 20-bit demultiplexed SD format HIGHHIGHX HIGHLOW Chroma Luma 20-bit data input SD format HIGHHIGH X LOW LOW DATA DATA 10-bit multiplexed 3G DDR format LOW LOW HIGHHIGHLOW High Impedance Data Stream One/Data Stream Two 10-bit multiplexed HD format LOW LOW LOW HIGHLOW High Impedance Luma/Chroma 10-bit data input HD format LOW LOW LOW LOW LOW High Impedance DATA 10-bit multiplexed SD format LOW HIGHX HIGHLOW High Impedance Luma/Chroma 10-bit multiplexed SD format LOW HIGHX LOW LOW High Impedance DATA 10-bit ASI input SD format LOW HIGH X LOW HIGHHigh Impedance DVB-ASI data Table 4-2: GS2962 Input Video Data Format Selections (Continued) Input Data Format Pin/Register Bit Settings DIN[9:0] DIN[19:10] 20BIT /10BIT RATE _SEL0 RATE _SEL1 SMPTE _BYPASS DVB_ASI |
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