AD9680 datasheet(39/97 Pages) AD

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Data Sheet

AD9680

Rev. C | Page 39 of 97

Figure 128, Figure 129, and Figure 130 show the SFDR vs.

analog input frequency for various buffer settings for the

AD9680-500. The recommended settings shown in Table 10

were used to take the data while changing the contents of

100

10.3

95.3

150.3

180.3

240.3

301.3

340.7

390.3

450.3

ANALOG INPUT FREQUENCY (MHz)

1.0×

1.5×

2.0×

3.0×

4.5×

Figure 128. Buffer Current Sweeps, AD9680-500 (SFDR vs. IBUFF);

fIN < 500 MHz; Front-End Network Shown in Figure 115 Buffer Control 1

(0x018) = 1.0×, 1.5×, 2.0×, 3.0×, or 4.5×

450.3

480.3

510.3

515.3

ANALOG INPUT FREQUENCY (MHz)

610.3

765.3

810.3

985.3

4.0×

5.0×

6.0×

7.0×

8.0×

Figure 129. Buffer Current Sweeps, AD9680-500 (SFDR vs. IBUFF);

450 MHz < fIN < 1000 MHz; Front-End Network Shown in Figure 115

1010.3

1205.3

1410.3

1600.3

1810.3

1950.3

ANALOG INPUT FREQUENCY (MHz)

4.0×

5.0×

6.0×

7.0×

8.0×

Figure 130. Buffer Current Sweeps, AD9680-500 (SFDR vs. IBUFF);

1 GHz < fIN < 2 GHz; Front-End Network Shown in Figure 115

AD9680 Datasheet(PDF) 39 Page - Analog Devices

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