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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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GS1672 датащи(PDF) 73 Page - Semtech Corporation |
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GS1672 датащи(HTML) 73 Page - Semtech Corporation |
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73 / 116 page  GS1672 HD/SD-SDI Serializer with Complete SMPTE Audio & Video Support Data Sheet 53623 - 6 July 2011 73 of 116 The SDO and SDO pins of the device provide the serial digital output. Compliance with all requirements defined in Section 4.12.1 through Section 4.12.4 is guaranteed when measured across a 75Ω terminated load at the output of 1m of Belden 1694A cable, including the effects of the Gennum recommended ORL matching network, BNC and coaxial cable connection, except where otherwise stated. Figure 4-23 illustrates this requirement, which is in accordance with the measurement methodology defined in SMPTE 292 and SMPTE 259M. Figure 4-23: ORL Matching Network, BNC and Coaxial Cable Connection 4.12.1 Output Signal Interface Levels The Serial Digital Output signals (SDO and SDO pins), of the device meet the amplitude requirements as defined in SMPTE 424M for an unbalanced generator (single-ended). The signal amplitude is controlled to better than +/-7% of the nominal level defined in SMPTE 424M, when an external 750Ω 1% resistor is connected between the RSET pin of the device and VCC. The output signal amplitude can be reduced to less than 1/10th of the nominal amplitude, defined above, by increasing the value of the resistor connected between the RSET pin of the device and VCC. These requirements are met across all ambient temperature and power supply operating conditions described in the Electrical Characteristics on page 18. The output amplitude of the GS1672 can be adjusted by changing the value of the RSET resistor as shown in Table 4-29. For a 800mVp-p output a value of 750Ω is required. A ±1% SMT resistor should be used. The RSET resistor is part of the high speed output circuit of the GS1672. The resistor should be placed as close as possible to the RSET pin. In addition, an anti-pad should be used underneath the resistor. Table 4-28: Serial Digital Output - Serial Output Data Rate Parameter Symbol Conditions Min Typ Max Units Serial Output Data Rate BRSDO SMPTE 292 signal − 1.485, 1.485/1.001 − Gb/s SMPTE 259M-C signal − 270 − Mb/s DVB-ASI signal − 270 − Mb/s DUT GS1672 ORL Matching Network BNC BNC 75Ω resistive load Measuring device 1m Belden 1694A75Ω coaxialcable |
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