AD9857SLASHPCB datasheet(11/40 Pages) AD

11 / 40 page

AD9857

Rev. C| Page 11 of 40

TYPICAL PERFORMANCE CHARACTERISTICS

MODULATED OUTPUT SPECTRAL PLOTS

–10

–20

–30

–40

–50

–60

–70

–80

–90

–100

START 0Hz

5MHz/

STOP 50MHz

Figure 3. QPSK at 42 MHz and 2.56 MS/s; 10.24 MHz External Clock

with REFCLK Multiplier = 12, CIC Interpolation Rate = 3,

4× Oversampled Data

START 0Hz

4MHz/

STOP 40MHz

–8

–16

–24

–32

–40

–48

–56

–64

–72

–80

Figure 4. 64-QAM at 28 MHz and 6 MS/s; 36 MHz External Clock

with REFCLK Multiplier = 4, CIC Interpolation Rate = 2,

3× Oversampled Data

START 0Hz

8MHz/

STOP 80MHz

–10

–20

–30

–40

–50

–60

–70

–80

–90

–100

Figure 5. 16-QAM at 65 MHz and 1.28 MS/s; 10.24 MHz External Clock

with REFCLK Multiplier = 18, CIC Interpolation Rate = 9,

4× Oversampled Data

START 0Hz

5MHz/

STOP 50MHz

–8

–16

–24

–32

–40

–48

–56

–64

–72

–80

Figure 6. 256-QAM at 38 MHz and 6 MS/s; 48 MHz External Clock

with REFCLK Multiplier = 4, CIC Interpolation Rate = 2,

4× Oversampled Data

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