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AD9625BBPRL-2.5 Datasheet(PDF) 72 Page - Analog Devices |
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AD9625BBPRL-2.5 Datasheet(HTML) 72 Page - Analog Devices |
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72 / 74 page  AD9625 Data Sheet Rev. C | Page 70 of 72 Bit No. Access Bit Description [1:0] RW DDC 1 polyphase (decimate by 8) gain in units of 6 dB. 00: 0 dB gain. 01: 6 dB gain 10: 12 dB gain. 11: 18 dB gain. Table 113. DDC 1 Phase Increment Least Significant Bits Register, Address 0x139 (Default = 0x00) Bit No. Access Bit Description [7:0] RW DDC 1 NCO phase increment value. Phase increment for the NCO within DDC 1 (Bits[7:0]). The output frequency = (decimal(Register 0x13A[1:0]; Register 0x139[7:0]) × fS)/1024. Table 114. DDC 1 Phase Increment Most Significant Bits Register, Address 0x13A (Default = 0x00) Bit No. Access Bit Description [7:2] Unused. [1:0] RW DDC1 NCO phase increment value (Bits[9:8]). Table 115. SYSREF±Hold Time Guardband Register, Address 0x13B (Default = 0x00) Bit No. Access Bit Description [7:5] RW These bits increase the SYSREF± hold time guardband that is used to assert the SYSREF± hold IRQ flag in register 0x100[3]. This time is informational only and does not change the actual hold time for SYSREF±. 000: No additional guardband hold time. 001: 35 ps of additional hold time guardband for 0x100[3]. 010: 70 ps of additional hold time guardband for 0x100[3]. 011: 105 ps of additional hold time guardband for 0x100[3]. 100: 140 ps of additional hold time guardband for 0x100[3]. 101: 175 ps of additional hold time guardband for 0x100[3]. 110: 210 ps of additional hold time guardband for 0x100[3]. 111: 245 ps of additional hold time guardband for 0x100[3]. [4:0] RW Reserved. Table 116. SYSREF± Setup Time Guardband Register, Address 0x13C (Default = 0x00) Bit No. Access Bit Description [7:5] RW These bits increase the SYSREF± setup time guardband that is used to assert the SYSREF± setup IRQ flag in register 0x100[2]. This time is informational only and does not change the actual setup time for SYSREF±. 000: No additional guardband setup time. 001: 35 ps of additional setup time guardband for 0x100[2]. 010: 70 ps of additional setup time guardband for 0x100[2]. 011: 105 ps of additional setup time guardband for 0x100[2]. 100: 140 ps of additional setup time guardband for 0x100[2]. 101: 175 ps of additional setup time guardband for 0x100[2]. 110: 210 ps of additional setup time guardband for 0x100[2]. 111: 245 ps of additional setup time guardband for 0x100[2]. [4:0] RW Reserved. |
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