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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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GS2972 датащи(PDF) 86 Page - Semtech Corporation |
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GS2972 датащи(HTML) 86 Page - Semtech Corporation |
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86 / 125 page  GS2972 3G/HD/SD-SDI Serializer with Complete SMPTE Audio & Video Support Final Data Sheet Rev. 9 GENDOC-047479 September 2013 86 of 125 www.semtech.com 4.12.3 Slew Rate Selection The GS2972 supports two user-selectable output slew rates. Control of the slew rate is determined by the setting of the RATE_SEL0 input pin. When this pin is set HIGH, the output slew rate matches the requirements as defined by the SMPTE ST 259-C standard. When this pin is set LOW, the output slew rate is better than the requirements as defined by the SMPTE ST 424 standard. These requirements is met across all ambient temperature and power supply operating conditions described in Section 2. This requirement is summarized in Table 4-31: 4.12.4 Serial Digital Output Mute When the SDO_EN/DIS pin is LOW, the serial digital output signals of the device become high-impedance, reducing system power. The serial digital output is also placed in the high-impedance state when the LOCKED pin is LOW, or when the STANDBY pin is HIGH. Table 4-31: Serial Digital Output - Rise/Fall Time Parameter Symbol Conditions Min Typ Max Units Serial Output Rise/Fall Time 20% ~ 80% SDOTR SMPTE ST 292/ST 424 signal −− 135 ps SMPTE ST 259-C signal 400 − 800 ps |
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