AD9625 datasheet(71/74 Pages) AD

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Data Sheet

AD9625

Rev. C | Page 69 of 72

Table 107. Trim Setting Control Register, Address 0x121 (Default = 0x00 for AD9625-2.5 and AD9625-2.6; Default = 0x03 for

AD9625-2.0)

Bit No.

Access

Bit Description

[7:2]

Reserved.

[1:0]

Select trim setting, based on sample rate (AD9625-2.0 and AD9625-2.5):

00: Trim 0: for 2.5 GSPS encode rate (default for AD9625-2.5) (not available for AD9625-2.0).

01: Trim 1: for 2.4 GSPS to 2.5 GSPS encode rate (not available for AD9625-2.0).

10: Trim 2: for 2.2 GSPS to 2.4 GSPS encode rate (not available for AD9625-2.0).

11: Trim 3: for 330 MSPS to 2.2 GSPS encode rate (default for AD9625-2.0).

Select trim setting, based on sample rate (AD9625-2.6):

00: Trim 0: for 2.55 GSPS to 2.6 GSPS encode rate (default for AD9625-2.6).

01: Trim 1: for 2.4 GSPS to 2.55 GSPS encode rate.

10: Trim 2: for 2.2 GSPS to 2.4 GSPS encode rate.

11: Trim 3: for 330 MSPS to 2.2 GSPS encode rate.

Table 108. Unused Register, Address 0x12A (Default = 0x05)

Bit No.

Access

Bit Description

[7:0]

Reserved; maintain default setting of 0x05.

Table 109. DDC 0 Gain Control Register, Address 0x130 (Default = 0x00)

Bit No.

Access

Bit Description

[7:6]

Unused.

[5:4]

DDC 0 polyphase (decimate by 2) gain in units of 6 dB.

00: 0 dB gain.

01: 6 dB gain.

10: 12 dB gain.

11: 18 dB gain.

[3:2]

Unused.

[1:0]

DDC 0 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 110. DDC 0 Phase Increment Least Significant Bits Register, Address 0x131 (Default = 0x00)

Bit No.

Access

Bit Description

[7:0]

DDC 0 NCO phase increment value. Phase increment for the NCO within DDC 0 (Bits[7:0]).

The output frequency = (decimal(Register 0x132[1:0]; Register 0x131[7:0]) × fS)/1024.

Table 111. DDC 0 Phase Increment Most Significant Bits Register, Address 0x132 (Default = 0x00)

Bit No.

Access

Bit Description

[7:2]

Unused.

[1:0]

DDC 0 NCO phase increment value. Phase increment for the NCO within DDC 0 (Bits[9:8]).

Table 112. DDC 1 Gain Control Register, Address 0x138 (Default = 0x00)

Bit No.

Access

Bit Description

[7:6]

Unused.

[5:4]

DDC 1 polyphase (decimate by 2) gain in units of 6 dB.

00: 0 dB gain.

01: 6 dB gain.

10: 12 dB gain.

11: 18 dB gain.

[3:2]

Unused.

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