AD9689-2000EBZ datasheet(56/134 Pages) AD

56 / 134 page

AD9689

Data Sheet

Rev. A | Page 56 of 134

Table 16. DDC Decimation Filter Characteristics

Filter Name

Filter Type

Decimation

Ratio

Pass Band

(rad/sec)

Stop Band

(rad/sec)

Pass-Band

Ripple (dB)

Stop Band

Attenuation (dB)

HB4

FIR low-pass

0.1 x π/2

1.9 x π/2

<±0.001

>100

HB3

FIR low-pass

0.2 x π/2

1.8 x π/2

<±0.001

>100

HB2

FIR low-pass

0.4 x π/2

1.6 x π/2

<±0.001

>100

HB1

FIR low-pass

0.8 x π/2

1.2 x π/2

<±0.001

>100

TB2

FIR low-pass

0.4 x π/3

1.6 x π/3

<±0.002

>100

TB1 1

FIR low-pass

0.8 x π/3

1.2 x π/3

<±0.005

>100

FB2

FIR low-pass

0.4 x π/5

1.6 x π/5

<±0.001

>100

TB1 is only supported in DDC0 and DDC1.

Table 17. DDC Filter Configurations1

ADC

Sample

Rate

DDC Filter Configuration

Real (I) Output

Complex (I/Q) Outputs

Alias

Protected

Bandwidth

Ideal2 SNR

Improvement

(dB)

Decimation

Ratio

Sample

Rate

Decimation

Ratio

Sample Rate

HB1

fS/2 (I) + fS/2 (Q)

fS/2 × 80%

TB1 3

N/A

fS/3 (I) + fS/3 (Q)

fS/3 × 80%

2.7

HB2 + HB1

fS/2

fS/4 (I) + fS/4 (Q)

fS/4 × 80%

TB2 + HB1

fS/3

fS/6 (I) + fS/6 (Q)

fS/6 × 80%

5.7

HB3 + HB2 + HB1

fS/4

fS/8 (I) + fS/8 (Q)

fS/8 × 80%

FB2 + HB1

fS/5

fS/10 (I) + fS/10 (Q)

fS/10 × 80%

TB2 + HB2 + HB1

fS/6

fS/12 (I) + fS/12 (Q)

fS/12 × 80%

8.8

FB2 + TB13

N/A

fS/15 (I) + fS/15 (Q)

fS/15 × 80%

9.7

HB4 + HB3 + HB2 + HB1

fS/8

fS/16 (I) + fS/16 (Q)

fS/16 × 80%

FB2 + HB2 + HB1

fS/10

fS/20 (I) + fS/20 (Q)

fS/20 × 80%

TB2 + HB3 + HB2 + HB1

fS/12

fS/24 (I) + fS/24 (Q)

fS/24 × 80%

11.8

HB2 + FB2 + TB13

N/A

fS/30 (I) + fS/30 (Q)

fS/30 × 80%

12.7

FB2 + HB3 + HB2 + HB1

fS/20

fS/40 (I) + fS/40 (Q)

fS/40 × 80%

TB2 + HB4 + HB3 + HB2 + HB1

fS/24

fS/48 (I) + fS/48 (Q)

fS/48 × 80%

14.8

N/A means not applicable.

Ideal SNR improvement due to oversampling + filtering = 10log(bandwidth/fS/2).

TB1 is only supported in DDC0 and DDC1.

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