AD6684 datasheet(46/107 Pages) AD

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AD6684

Data Sheet

Rev. 0 | Page 46 of 107

Chip

Application

Layer

Chip

Decimation

Ratio

DDC Input

Type

DDC

Output

Type

Bandwidth

Per DDC1

No. of

Virtual

Converters

Required

Two DDCs

Complex

40%× fS

0x0009 = 0x01, 0x02, or 0x03 (pair selection)

0x0200 = 0x22 (two DDCs; I only selected)

0x0201 = 0x01 (chip decimate by 2)

0x0310, 0x0330 = 0x4B (complex mixer; 6 dB gain;

variable IF; complex output; HB1 filter)

0x0311, 0x0331 = 0x04 (DDC 0 I input = ADC

Channel A/Channel C; DDC 0 Q input = ADC

Channel B/Channel D)

0x0314, 0x0315, 0x0316, 0x0317, 0x0318, 0x031A,

0x031D, 0x031E, 0x031F, 0x0320, 0x0321, 0x0322 =

FTW and POW set as required by application for

DDC 0

0x0334, 0x0335, 0x0336, 0x0337, 0x0338, 0x033A,

0x033D, 0x033E, 0x033F, 0x0340, 0x0341, 0x0342=

FTW and POW set as required by application for

DDC 1

Two DDCs

Complex

20% × fS

0x0009 = 0x01, 0x02, or 0x03 (pair selection)

0x0200 = 0x02 (two DDCs; I/Q selected)

0x0201 = 0x02 (chip decimate by 4)

0x0310, 0x0330 = 0x80 (complex mixer; 0 dB gain;

variable IF; complex outputs; HB2 + HB1 filters)

0x0311, 0x0331 = 0x04 (DDC I input = ADC

Channel A/Channel C; DDC Q input = ADC

Channel B/Channel D)

0x0314, 0x0315, 0x0316, 0x0317, 0x0318, 0x031A,

0x031D, 0x031E, 0x031F, 0x0320, 0x0321, 0x0322 =

FTW and POW set as required by application for

DDC 0

0x0334, 0x0335, 0x0336, 0x0337, 0x0338, 0x033A,

0x033D, 0x033E, 0x033F, 0x0340, 0x0341, 0x0342=

FTW and POW set as required by application for

DDC 1

Two DDCs

Complex

Real

10% × fS

0x0009 = 0x01, 0x02, or 0x03 (pair selection)

0x0200 = 0x22 (two DDCs; I only selected)

0x0201 = 0x02 (chip decimate by 4)

0x0310, 0x0330 = 0x89 (complex mixer; 0 dB gain;

variable IF; real output; HB3 + HB2 + HB1 filters)

0x0311, 0x0331 = 0x04 (DDC I input = ADC

Channel A/Channel C; DDC Q input = ADC

Channel B/Channel D)

0x0314, 0x0315, 0x0316, 0x0317, 0x0318, 0x031A,

0x031D, 0x031E, 0x031F, 0x0320, 0x0321, 0x0322 =

FTW and POW set as required by application for

DDC 0

0x0334, 0x0335, 0x0336, 0x0337, 0x0338, 0x033A,

0x033D, 0x033E, 0x033F, 0x0340, 0x0341, 0x0342=

FTW and POW set as required by application for

DDC 1

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