AD9161BBCZ datasheet(67/144 Pages) AD

67 / 144 page

Data Sheet

AD9161/AD9162

Rev. D | Page 67 of 144

–0.6

–0.5

–0.4

–0.3

–0.2

–0.1

BANDWIDTH (%

fDATA)

PASS-BAND RIPPLE

IMAGE REJECTION

Figure 163. Interpolation Filter Performance Beyond Specified Bandwidth for

the 80% Filters

Figure 163 shows the performance of the interpolation filters

beyond 0.4 × fDATA. The ripple increases much slower than the

image rejection decreases. This means that if the application can

tolerate degraded image rejection from the interpolation filters,

more bandwidth can be used.

Most of the filters are specified to 0.45 × fDATA (with pass band).

Figure 164 to Figure 171 show the filter response for each of the

interpolator filters on the AD9161/AD9162.

NORMALIZED FREQUENCY (Rad/Sample)

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

–140

–120

–100

–80

–60

–40

–20

Figure 164. First 2× Half-Band 80% Filter Response

NORMALIZED FREQUENCY (Rad/Sample)

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

–140

–120

–100

–80

–60

–40

–20

Figure 165. First 2× Half-Band 90% Filter Response

NORMALIZED FREQUENCY (Rad/Sample)

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

–160

–140

–120

–100

–80

–60

–40

–20

Figure 166. 3× Third-Band 80% Filter Response

NORMALIZED FREQUENCY (Rad/Sample)

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

–160

–140

–120

–100

–80

–60

–40

–20

Figure 167. 3× Third-Band 90% Filter Response

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