AD9853_15 datasheet(30/31 Pages) AD

30 / 31 page

OBSOLETE

AD9853

–30–

REV. C

Plots of typical output spectrum from the AD9853-45PCB

evaluation board (conditions: DUT supply voltage = +3.3 V,

QPSK modulation, 2.048 Mb/s, 20.48 MHz ext. REFCLK,

× REFCLK enabled, SRRC filter function, A

OUT = 40 MHz,

α = 0.25, 50 MHz low-pass filter).

–25

–35

REF 50.0MHz

INC 10MHz

RES bw 60MHz

VID bw 5.4kHz

10.0MHz/div

500ms/div

–65

–95

–105

–45

–55

–85

–75

ATTEN 30dB 50

TG off

Figure 41. Direct DAC Output

–25

–35

REF 50.0MHz

INC 10MHz

RES bw 10MHz

VID bw 5.4kHz

10.0MHz/div

500ms/div

–65

–95

–105

–45

–55

–85

–75

ATTEN 30dB 50

TG off

2ND HARMONIC

Figure 42. Output of AD8320 Programmable Line Driver

Amplifier Driven by AD9853 Modulator

Plots of typical output spectrum from the AD9853-65PCB

evaluation board (conditions: DUT supply voltage = +4.0 V,

QPSK modulation, 2.7792 Mb/s, 27.792 MHz ext. REFCLK,

× REFCLK enabled, SRRC filter function, A

OUT = 60 MHz,

α = 0.25, 70 MHz low-pass filter).

–25

–35

REF 100.0MHz

INC 20MHz

RES bw 10MHz

VID bw 5.4kHz

20.0MHz/div

1s/div

–65

–95

–105

–45

–55

–85

–75

ATTEN 10dB 50

TG off

Figure 43. Direct DAC Output

–2.0

12.0

REF 100.0MHz

INC 20MHz

RES bw 10MHz

VID bw 5.4kHz

20.0MHz/div

1s/div

42.0

72.0

82.0

22.0

32.0

62.0

52.0

ATTEN 30dB 50

TG off

2ND

HARMONIC

3RD

HARMONIC

Figure 44. Output of AD8320 Programmable Line Driver

Amplifier Driven by AD9853 Modulator

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