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GS6151 数据表(PDF) 23 Page - Semtech Corporation |
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GS6151 数据表(HTML) 23 Page - Semtech Corporation |
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23 / 77 page ![]() GS6151 Final Data Sheet Rev.4 PDS-060389 August 2015 23 of 77 Semtech Proprietary & Confidential www.semtech.com 4.5.1 Output Impedance Each of the GS6151’s output buffers include two on-chip, 50Ω termination resistors. 4.5.2 Output Signal Interface Levels The serial digital outputs operate within specification with an output CML power supply of 1.2V to 2.5V. 4.5.3 Adjustable Output Swing Through the GSPI, the output swing can be set in the range from approximately 230mVppd to 930mVppd in 45mVppd increments, when the outputs are terminated with 50Ω loads. For the exact values, please see Table 4-4 below. The output swing for each data rate is controlled using the bits in the DRIVER_CONTROL_REG_3, DRIVER_CONTROL_REG_4, DRIVER_CONTROL_REG_5, and DRIVER_CONTROL_REG_6 registers at addresses 1Ch through 1Fh. The device automatically adjusts the swing setting depending on the state of the device (i.e. detected rate, bypass mode, or mute). There are separate register controls for mute, bypass and each data rate. Table 4-4: Serial Digital Output Swing Settings Register Setting (See Note 1) Min Typ Max Units 0000b 175 230 290 mV 0001b 205 275 345 mV 0010b 245 325 405 mV 0011b (default) 280 370 460 mV 0100b 310 410 510 mV 0101b 345 460 575 mV 0110b 380 510 640 mV 0111b 420 560 700 mV 1000b 455 605 760 mV 1001b 490 655 820 mV 1010b 530 705 880 mV 1011b 565 755 945 mV 1100b 600 800 1000 mV |
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