AD6674 datasheet(31/97 Pages) AD

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AD6674

Data Sheet

Rev. C | Page 30 of 96

The recommended settings shown in Table 10 were used to

collect the data while changing only the contents of Register 0x018.

INPUT FREQUENCY (MHz)

110

160

210

260

310

360

410

460

1.5×

3.0×

4.5×

Figure 77. Buffer Current Sweeps, AD6674-1000 (SFDR vs. Input Frequency

and IBUFF); 10 MHz < fIN < 500 MHz; Front-End Network Shown in Figure 74

INPUT FREQUENCY (MHz)

503.4

677.6

851.9

1026.2

1200.5

1374.8

3.0×

4.0×

5.0×

6.0×

Figure 78. Buffer Current Sweeps, AD6674-1000 (SFDR vs. Input Frequency

and IBUFF); 500 MHz < fIN < 1500 MHz; Front-End Network Shown in Figure 74

INPUT FREQUENCY (MHz)

1513.4

1607.4

1701.5

1795.6

1889.8

4.5×

5.5×

6.5×

7.5×

8.5×

Figure 79. Buffer Current Sweeps, AD6674-1000 (SFDR vs. Input Frequency

and IBUFF); 1500 MHz < fIN < 2 GHz; Front-End Network Shown in Figure 74

In certain high frequency applications, the SFDR can be

improved by reducing the full-scale setting, as shown in Table 10.

At high frequencies, the performance of the ADC core is limited by

jitter. The SFDR can be improved by reducing the full-scale level.

1.52GHz

1.65GHz

1.76GHz

1.9GHz

1.95GHz

–3

–2

–1

INPUT LEVEL (dBFS)

1.52GHz

1.65GHz

1.76GHz

1.9GHz

1.95GHz

Figure 80. SNR/SFDR vs. Input Level and Input Frequencies, AD6674-1000

Figure 81, Figure 82, and Figure 83 show the SFDR vs. analog

input frequency for various buffer settings for the AD6674-500.

The recommended settings shown in Table 10 were used to take

the data while changing the contents of register 0x018 only.

INPUT FREQUENCY (MHz)

1.5×

2.0×

2.5×

3.5×

4.5×

Figure 81. Buffer Current Sweeps, AD6674-750 (SFDR vs. Input Frequency and

IBUFF); 10 MHz < fIN < 450 MHz; Front-End Network Shown in Figure 74

INPUT FREQUENCY (MHz)

450.3

480.3

510.3

515.3

610.3

765.3

810.3

985.3 1010.3

4.5×

5.5×

6.5×

7.5×

Figure 82. Buffer Current Sweeps, AD6674-750 (SFDR vs. Input Frequency and

IBUFF); 450 MHz < fIN < 800 MHz; Front-End Network Shown in Figure 74

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