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AD9546/PCBZ 数据表(PDF) 77 Page - Analog Devices |
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AD9546/PCBZ 数据表(HTML) 77 Page - Analog Devices |
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77 / 205 page  Data Sheet AD9546 Rev. 0 | Page 77 of 205 REFERENCE CLOCK INPUT RESOURCES The AD9546 has eight reference clock inputs as shown in Figure 59. The eight inputs comprise two groups of four: • Four primary reference inputs (REFA, REFAA, REFB, and REFBB) • Four auxiliary reference inputs (auxiliary REF0, auxiliary REF1, auxiliary REF2, and auxiliary REF3) The two groups are functionally identical except for the configuration of their input receivers. The primary reference inputs have configurable input receivers (see the Reference Receivers section) and dedicated pins. The user can configure the REFA and REFAA inputs as a single differential receiver or as two independent, single-ended receivers. The REFB and REFBB inputs can be configured likewise. The auxiliary reference clock inputs have nonconfigurable, single-ended CMOS receivers, and rather than having dedicated pins, they are accessible only through Mx Pins (see the Status and Control Pins section). Each reference clock input has a dedicated reference monitor, reference divider (R divider), TDC, and reference demodulator. AD9546 TIME STAMPS REFA REFAA REFB REFBB TIME STAMPS TIME STAMPS TIME STAMPS TIME STAMPS TIME STAMPS TIME STAMPS TIME STAMPS AUX REF0 AUX REF1 AUX REF2 AUX REF3 M0 M1 M2 M3 M4 SDO/M5 CSB/M6 DEMOD TDC REF MON ÷R DEMOD REF MON DEMOD TDC REF MON ÷R DEMOD REF MON DEMOD TDC REF MON ÷R Mx PIN FUNCTION LOGIC Figure 59. Reference Inputs Block Diagram |
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