AD9856SLASHPCB datasheet(6/32 Pages) AD

6 / 32 page

AD9856

–6–

REV. B

Typical Modulated Output Spectral Plots

START 0Hz

5MHz/

STOP 50MHz

–8

REF LVL

–25dBm

1AP

–16

–24

–32

–40

–48

–56

–64

–72

–80

RBW

10kHz

RF ATT 10dB

VBW

1kHz

SWT

12.5s

Unit

dBm

Figure 1. QPSK at 42 MHz and 2.56 MS/s; 10.24 MHz

External Clock with REFCLK Multiplier = 12, CIC = 3,

HB3 On, 2

× Data

START 0Hz

4MHz/

STOP 40MHz

–8

REF LVL

–30dBm

1AP

–16

–24

–32

–40

–48

–56

–64

–72

–80

RBW

10kHz

RF ATT

10dB

VBW

1kHz

SWT

10s

UNIT

dBm

Figure 2. 64-QAM at 28 MHz and 6 MS/s; 36 MHz External

Clock with REFCLK Multiplier = 4, CIC = 2, HB3 Off, 3

× Data

START 0Hz

8MHz/

STOP 80MHz

–8

REF LVL

–25dBm

1AP

–16

–24

–32

–40

–48

–56

–64

–72

–80

RBW

10kHz

RF ATT

10dB

VBW

1kHz

SWT

20s

Unit

dBm

Figure 3. 16-QAM at 65 MHz and 2.56 MS/s; 10.24 MHz

External Clock with REFCLK Multiplier = 18, CIC = 9,

HB3 Off, 2

× Data

START 0Hz

5MHz/

STOP 50MHz

–8

REF LVL

–30dBm

1AP

–16

–24

–32

–40

–48

–56

–64

–72

–80

RBW

10kHz

RF ATT

10dB

VBW

1kHz

SWT

12.5s

UNIT

dBm

Figure 4. 256-QAM at 38 MHz and 6 MS/s; 48 MHz External

Clock with REFCLK Multiplier = 4, CIC = 2, HB3 Off, 4

× Data

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