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ADF4401ABCEZ датащи(PDF) 28 Page - Analog Devices |
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ADF4401ABCEZ датащи(HTML) 28 Page - Analog Devices |
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28 / 39 page ![]() ADF4401A Data Sheet Rev. 0 | Page 28 of 39 Address: 0x22, Default: 0x00, Name: REG0022 Choos e Between Single-Ended or Differential REFin. RDIV2. Reference Doubler. 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 [7] RESERVED [3:0] RESERVED [6] REFIN_MODE (R/W) [4] RDIV2 (R/W) [5] REF_DOUB (R/W) Table 24. Bit Descriptions for REG0022 Bit(s) Bit Name Description Default Access 7 RESERVED Reserved. 0x0 R 6 REFIN_MODE Choose Between Single-Ended or Differential REFIN. 0x0 R/W 0: single-ended REFIN. 1: differential REFIN. 5 REF_DOUB Reserved. 0x0 R/W 4 RDIV2 RDIV2. Controls the reference divide by 2 clock. This feature can be used to provide a 50% duty cycle signal to the PFD. 0x0 R/W 0: RDIV2 disabled. 1: RDIV2 enabled. [3:0] RESERVED Reserved. 0x0 R Address: 0x24, Default: 0x80, Name: REG0024 Feedback. Divis ion Selection. 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 1 [7] FB_SEL (R/W) [3:0] RESERVED [6:4] DIV_SEL (R/W) Table 25. Bit Descriptions for REG0024 Bit(s) Bit Name Description Default Access 7 FB_SEL Feedback. 0x1 R/W 0: divider feedback to N counter. 1: fundamental feedback to N counter. [6:4] DIV_SEL Division Selection. 0x0 R/W 0: divide 1. 1: divide 2. 10: divide 4. 11: divide 8. 100: divide 16. 101: divide 32. 110: divide 64. 111: reserved. [3:0] RESERVED Reserved. 0x0 R |
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