AD9625 datasheet(72/74 Pages) AD

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AD9625

Data Sheet

Rev. C | Page 70 of 72

Bit No.

Access

Bit Description

[1:0]

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]

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]

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]

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]

Reserved.

Table 116. SYSREF± Setup Time Guardband Register, Address 0x13C (Default = 0x00)

Bit No.

Access

Bit Description

[7:5]

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]

Reserved.

AD9625 Datasheet(PDF) 72 Page - Analog Devices

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