AD6674 datasheet(63/97 Pages) AD

63 / 97 page

AD6674

Data Sheet

Rev. C | Page 62 of 96

Table 30. VDR Tuning Words and Absolute Frequency

Values, 25% BW, Complex Mode (fS = 737.28 MSPS)

Tuning

Word

Lower

Band Edge

(MHz)

Center

Frequency

(MHz)

Upper Band

Edge (MHz)

0 (0x00)

−92.16

0.00

92.16

1 (0x01)

−46.08

46.08

138.24

2 (0x02)

0.00

92.16

184.32

3 (0x03)

46.08

138.24

230.40

4 (0x04)

92.16

184.32

276.48

5 (0x05)

138.24

230.40

322.56

6 (0x06)

184.32

276.48

368.64

7 (0x07)

230.40

322.56

414.72

8 (0x08)

276.48

368.64

460.80

9 (0x09)

322.56

414.72

506.88

10 (0x0A)

368.64

460.80

552.96

11 (0x0B)

414.72

506.88

599.04

12 (0x0C)

460.80

552.96

645.12

13 (0x0D)

506.88

599.04

691.20

14 (0x0E)

552.96

645.12

737.28

15 (0x0F)

599.04

691.20

783.36

Table 31 and Table 32 show the tuning words and frequency

values for the 43% complex mode. Table 31 shows the relative

frequency values, and Table 32 shows the absolute frequency

values based on a sample rate of 737.28 MSPS. Figure 122 shows

the frequency zones for the 43% BW VDR mode with a center

frequency (fVDR) of fS/4 (tuning word = 0x04). The frequency

zones where the amplitude may not exceed –30 dBFS are the

upper and lower portions of the Nyquist band extending into

the complex domain.

dBFS

1/29

1/4

20/43

1/2

–1/2

Figure 122. 43% VDR Bandwidth, Complex Mode

Table 31. VDR Tuning Words and Relative Frequency

Values, 43% BW, Complex Mode

Tuning Word

Lower Band

Edge (MHz)

Center

Frequency

(MHz)

Upper Band

Edge (MHz)

0 (0x00)

–14/65 fS

14/65 fS

1 (0x01)

–11/72 fS

1/16 fS

5/18 fS

2 (0x02)

–1/11 fS

1/8 fS

16/47 fS

3 (0x03)

–1/36 fS

3/16 fS

29/72 fS

4 (0x04)

1/29 fS

1/4 fS

20/43 fS

5 (0x05)

7/72 fS

5/16 fS

19/36 fS

6 (0x06)

4/25 fS

3/8 fS

49/83 fS

7 (0x07)

2/9 fS

7/16 fS

47/72 fS

8 (0x08)

2/7 fS

1/2 fS

5/7 fS

9 (0x09)

25/72 fS

9/16 fS

7/9 fS

10 (0x0A)

34/83 fS

5/8 fS

21/25 fS

11 (0x0B)

17/36 fS

11/16 fS

65/72 fS

12 (0x0C)

23/43 fS

3/4 fS

28/29 fS

13 (0x0D)

43/72 fS

13/16 fS

37/36 fS

14 (0x0E)

31/47 fS

7/8 fS

12/11 fS

15 (0x0F)

13/18 fS

15/16 fS

83/72 fS

Table 32. VDR Tuning Words and Absolute Frequency

Values, 43% BW, Complex Mode (fS = 737.28 MSPS)

Tuning Word

Lower Band

Edge (MHz)

Center

Frequency

(MHz)

Upper Band

Edge (MHz)

0 (0x00)

−158.80

0.00

158.80

1 (0x01)

−112.64

46.08

204.80

2 (0x02)

−67.03

92.16

250.99

3 (0x03)

−20.48

138.24

296.96

4 (0x04)

25.42

184.32

342.92

5 (0x05)

71.68

230.40

389.12

6 (0x06)

117.96

276.48

435.26

7 (0x07)

163.84

322.56

481.28

8 (0x08)

210.65

368.64

526.63

9 (0x09)

256.00

414.72

573.44

10 (0x0A)

302.02

460.80

619.32

11 (0x0B)

348.16

506.88

665.60

12 (0x0C)

394.36

552.96

711.86

13 (0x0D)

440.32

599.04

757.76

14 (0x0E)

486.29

645.12

804.31

15 (0x0F)

532.48

691.20

849.92

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