AD6676EBZ datasheet(72/90 Pages) AD

72 / 90 page

AD6676

Data Sheet

Rev. A | Page 72 of 90

ADC Profile Selection Register

Address: 0x118, Reset: 0x00, Name: ADC_PROFILE

Table 54. Bit Descriptions for ADC_PROFILE

Bits

Bit Name

Description

Reset

Access

[7:2]

RESERVED

0x00

[1:0]

ADC_PROFILE

ADC profile. Select which one of the four ADC profiles to use in operation. The

user may switch between multiple profiles if calibration has taken place for each.

Note that the four profiles also cover SPI Register 0x141 to SPI Register 0x145 if

the digital mixer settings are varied between profiles.

0x0

Force End of Calibration Register

Address: 0x11A, Reset: 0x00, Name: FORCE_END_CAL

Table 55. Bit Descriptions for FORCE_END_CAL

Bits

Bit Name

Description

Reset

Access

[7:1]

RESERVED

0x00

FORCE_END_CAL

Setting this bit high and then low (two write operations) allows the user to

terminate the calibration and hand control back to the SPI. This SPI operation

should only be performed if the AD6676 fails to clear Register 0x116 after 400 ms.

0x0

This is a user accessible SPI register only when the controller is performing a calibration.

Decimation Mode Register

Address: 0x140, Reset: 0x01, Name: DEC_MODE

Table 56. Bit Descriptions for DEC_MODE

Bits

Bit Name

Settings

Description

Reset

Access

[7:3]

RESERVED

0x00

[2:0]

DEC_MODE

Decimation Mode.

0x01

001

Decimate by 32.

010

Decimate by 24.

011

Decimate by 16.

100

Decimate by 12.

Coarse NCO Tuning Register

Address: 0x141, Reset: 0x05, Name: MIX1_TUNING

Table 57. Bit Descriptions for MIX1_TUNING

Bits

Bit Name

Description

Reset

Access

[7:6]

RESERVED

0x0

[5:0]

MIX1_TUNING

Mix1 Tuning. Coarse downconversion frequency, in units of F

ADC/64. For

example, setting bits to 000011 downconverts by F

ADC × (3/64).

0x5

This register has four copies, one for each of the ADC profiles. The default for Profile 0 is 0x05; the default for the other profiles is 0x00.

At the default ADC clock rate of 3.2 GHz; the default Profile 0 downconversion frequency is (5/64) × 3.6 GHz = 250 MHz

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