AD6688 datasheet(107/138 Pages) AD

107 / 138 page

Data Sheet

AD6688

Rev. 0 | Page 107 of 138

Addr.

Name

Bit(s) Bit Name

Setting

Description

Reset

Access

0x0350 DDC2 control

DDC2 mixer select

0x0

R/W

Real mixer (I and Q inputs must be from the same real channel).

Complex mixer (I and Q must be from separate, real and

imaginary quadrature ADC receive channels; analog

demodulator).

DDC2 gain select

Gain can be used to compensates for the 6 dB loss associated

with mixing an input signal down to baseband and filtering out

its negative component.

0x0

R/W

0 dB gain.

6 dB gain (multiply by 2).

[5:4] DDC2 IF mode

0x0

R/W

Variable IF mode.

0 Hz IF mode.

fS Hz IF mode.

Test mode.

DDC2 complex to real

enable

0x0

R/W

Complex (I and Q) outputs contain valid data.

Real (I) output only. Complex to real enabled. Uses extra fS mixing

to convert to real.

[2:0] DDC2 decimation rate

select

Decimation filter selection.

0x0

R/W

000

HB1 + HB2 filter selection: decimate by 2 (complex to real

enabled), or decimate by 4 (complex to real disabled).

001

HB1 + HB2 + HB3 filter selection: decimate by 4 (complex to real

enabled), or decimate by 8 (complex to real disabled).

010

HB1 + HB2 + HB3 + HB4 filter selection: decimate by 8 (complex

to real enabled), or decimate by 16 (complex to real disabled).

011

HB1 filter selection: decimate by 1 (complex to real enabled), or

decimate by 2 (complex to real disabled).

100

HB1 + TB2 filter selection: decimate by 3 (complex to real

enabled), or decimate by 6 (complex to real disabled).

101

HB1 + HB2 + TB2 filter selection: decimate by 6 (complex to real

enabled), or decimate by 12 (complex to real disabled).

110

HB1 + HB2 + HB3 + TB2 filter selection: decimate by 12 (complex

to real enabled), or decimate by 24 (complex to real disabled).

111

Decimation determined by Register 0x0351, Bits[7:4].

0x0351 DDC2 input

select

[7:4] DDC2 decimation rate

select

Only valid when Register 0x0310, Bits[2:0] = 3'b111

0x0

R/W

TB2 + HB4 + HB3 + HB2 + HB1 filter selection: decimate by 48

(complex to real disabled), or decimate by 24 (complex to real

enabled)

FB2 + HB1 filter selection: decimate by 10 (complex to real

disabled), or decimate by 5 (complex to real enabled)

FB2 + HB2 + HB1 filter selection: decimate by 20 (complex to real

disabled), or decimate by 10 (complex to real enabled)

100

FB2 + HB3 + HB2 + HB1 filter selection: decimate by 40 (complex

to real disabled), or decimate by 20 (complex to real enabled)

Reserved

Reserved.

0x0

DDC2 Q input select

0x0

R/W

Channel A.

Channel B.

Reserved

Reserved.

0x0

DDC2 I input select

0x0

R/W

Channel A.

Channel B.

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