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AD9959/PCBZ 数据表(PDF) 23 Page - Analog Devices |
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AD9959/PCBZ 数据表(HTML) 23 Page - Analog Devices |
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23 / 44 page  Data Sheet AD9959 Rev. C | Page 23 of 44 Eight-Level Modulation—No RU/RD The modulation level bits (FR1[9:8]) are set to 10 (eight-level). The AFP select bits (CFR[23:22]) are set to a nonzero value. The RU/RD bits (FR1[11:10]) and the linear sweep enable bit (CFR[14]) are disabled. Note that the AFP select bits of the three channels not being used must be set to 00. Table 11 shows the assignment of profile pins and channels. For the condition in Table 11, the choice of channel word registers is based on the 3-bit value presented to Profile Pins [P0:P2]. For example, if PPC = X10 and [P0:P2] = 111, the contents of the Channel Word 7 register of Channel 2 are presented to the output of Channel 2. 16-Level Modulation—No RU/RD The modulation level bits (FR1[9:8]) are set to 11 (16-level). The AFP select bits (CFR[23:22]) are set to the desired modulation type. The RU/RD bits (FR1[11:10]) and the linear sweep enable bit (CFR[14]) are disabled. The AFP select bits of the three channels not being used must be set to 00. Table 12 displays how the profile pins and channels are assigned. For the conditions in Table 12, the profile register chosen is based on the 4-bit value presented to Profile Pins [P0:P3]. For example, if PPC = X11 and [P0:P3] = 1110, the contents of the Channel Word 14 register of Channel 3 is presented to the output of Channel 3. Two-Level Modulation Using Profile Pins for RU/RD When the RU/RD bits = 01, Profile Pin P2 and Profile Pin P3 are available for RU/RD. Note that only a modulation level of two is available in this mode. See Table 13 for available pin assignments. Eight-Level Modulation Using a Profile Pin for RU/RD When the RU/RD bits = 10, Profile Pin P3 is available for RU/RD. Note that only a modulation level of eight is available in this mode. See Table 14 for available pin assignments. Table 11. Profile Pin and Channel Assignments for Eight-Level Modulation (No RU/RD) Profile Pin Config. (PPC) (FR1[14:12]) P0 P1 P2 P3 Description X00 CH0 CH0 CH0 X Eight-level modulation on CH0, no RU/RD X01 CH1 CH1 CH1 X Eight-level modulation on CH1, no RU/RD X10 CH2 CH2 CH2 X Eight-level modulation on CH2, no RU/RD X11 CH3 CH3 CH3 X Eight-level modulation on CH3, no RU/RD Table 12. Profile Pin and Channel Assignments for 16-Level Modulation (No RU/RD) Profile Pin Config. (PPC) (FR1[14:12]) P0 P1 P2 P3 Description X00 CH0 CH0 CH0 CH0 16-level modulation on CH0, no RU/RD X01 CH1 CH1 CH1 CH1 16-level modulation on CH1, no RU/RD X10 CH2 CH2 CH2 CH2 16-level modulation on CH2, no RU/RD X11 CH3 CH3 CH3 CH3 16-level modulation on CH3, no RU/RD Table 13. Profile Pin and Channel Assignments for Two-Level Modulation (RU/RD Enabled) Profile Pin Config. (PPC) (FR1[14:12]) P0 P1 P2 P3 Description 000 CH0 CH1 CH0 RU/RD CH1 RU/RD Two-level modulation on CH0 and CH1 with RU/RD 001 CH0 CH2 CH0 RU/RD CH2 RU/RD Two-level modulation on CH0 and CH2 with RU/RD 010 CH0 CH3 CH0 RU/RD CH3 RU/RD Two-level modulation on CH0 and CH3 with RU/RD 011 CH1 CH2 CH1 RU/RD CH2 RU/RD Two-level modulation on CH1 and CH2 with RU/RD 100 CH1 CH3 CH1 RU/RD CH3 RU/RD Two-level modulation on CH1 and CH3 with RU/RD 101 CH2 CH3 CH2 RU/RD CH3 RU/RD Two-level modulation on CH2 and CH3 with RU/RD Table 14. Profile Pin and Channel Assignments for Eight-Level Modulation (RU/RD Enabled) Profile Pin Config. (PPC) (FR1[14:12]) P0 P1 P2 P3 Description X00 CH0 CH0 CH0 CH0 RU/RD Eight-level modulation on CH0 with RU/RD X01 CH1 CH1 CH1 CH1 RU/RD Eight-level modulation on CH1 with RU/RD X10 CH2 CH2 CH2 CH2 RU/RD Eight-level modulation on CH2 with RU/RD X11 CH3 CH3 CH3 CH3 RU/RD Eight-level modulation on CH3 with RU/RD |
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