AD6679 datasheet(61/81 Pages) AD

61 / 81 page

Data Sheet

AD6679

Rev. B | Page 61 of 81

Table 32. VDR Tuning Words and Absolute Frequency

Values, 25% BW, Complex Mode (fS = 491.52 MSPS)

Tuning

Word

Lower

Band Edge

(MHz)

Center

Frequency

(MHz)

Upper Band

Edge (MHz)

0 (0x00)

−61.44

0.00

61.44

1 (0x01)

−30.72

30.72

92.16

2 (0x02)

0.00

61.44

122.88

3 (0x03)

30.72

92.16

153.6

4 (0x04)

61.44

122.88

184.32

5 (0x05)

92.16

153.6

215.04

6 (0x06)

122.88

184.32

245.76

7 (0x07)

153.6

215.04

276.48

8 (0x08)

184.32

245.76

307.2

9 (0x09)

215.04

276.48

337.92

10 (0x0A)

245.76

307.2

368.64

11 (0x0B)

276.48

337.92

399.36

12 (0x0C)

307.2

368.64

430.08

13 (0x0D)

337.92

399.36

460.8

14 (0x0E)

368.64

430.08

491.52

15 (0x0F)

399.36

460.8

522.24

Table 33 and Table 34 show the tuning words and frequency

values for the 43% complex mode. Table 33 shows the relative

frequency values, and Table 34 shows the absolute frequency

values based on a sample rate of 491.52 MSPS. Figure 83 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

–30

Figure 83. 43% VDR Bandwidth, Complex Mode

Table 33. 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 34. VDR Tuning Words and Absolute Frequency

Values, 43% BW, Complex Mode (fS = 491.52 MSPS)

Tuning Word

Lower Band

Edge (MHz)

Center

Frequency

(MHz)

Upper Band

Edge (MHz)

0 (0x00)

−105.37

0.00

105.87

1 (0x01)

−75.09

30.72

136.53

2 (0x02)

−44.68

61.44

167.33

3 (0x03)

−13.65

92.16

197.97

4 (0x04)

16.95

122.88

228.61

5 (0x05)

47.79

153.6

259.41

6 (0x06)

78.64

184.32

290.17

7 (0x07)

109.23

215.04

320.85

8 (0x08)

140.43

245.76

351.09

9 (0x09)

170.67

276.48

382.29

10 (0x0A)

201.35

307.2

412.88

11 (0x0B)

232.11

337.92

443.73

12 (0x0C)

262.91

368.64

474.57

13 (0x0D)

293.55

399.36

505.17

14 (0x0E)

324.19

430.08

536.2

15 (0x0F)

354.99

460.8

566.61

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