AD9853 Analog Devices, AD9853 Datasheet - Page 30

• Manufacturer Part Number: AD9853
• Description: Programmable Digital OPSK/16-QAM Modulator
• Manufacturer: Analog Devices

AD9853
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,
6 REFCLK enabled, SRRC filter function, A
Figure 42. Output of AD8320 Programmable Line Driver
Amplifier Driven by AD9853 Modulator
= 0.25, 50 MHz low-pass filter).
–105
–105
–25
–35
–45
–55
–65
–75
–85
–95
–25
–35
–45
–55
–65
–75
–85
–95
REF 50.0MHz
INC 10MHz
REF 50.0MHz
INC 10MHz
ATTEN 30dB 50
ATTEN 30dB 50
Figure 41. Direct DAC Output
TG off
TG off
10.0MHz/div
10.0MHz/div
500ms/div
500ms/div
2ND HARMONIC
OUT
RES bw 10MHz
VID bw 5.4kHz
RES bw 60MHz
VID bw 5.4kHz
= 40 MHz,
–30–
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,
6 REFCLK enabled, SRRC filter function, A
Figure 44. Output of AD8320 Programmable Line Driver
Amplifier Driven by AD9853 Modulator
= 0.25, 70 MHz low-pass filter).
–105
82.0
32.0
–2.0
12.0
22.0
52.0
62.0
72.0
42.0
–25
–35
–45
–55
–65
–75
–85
–95
REF 100.0MHz
INC 20MHz
ATTEN 30dB 50
REF 100.0MHz
INC 20MHz
ATTEN 10dB 50
Figure 43. Direct DAC Output
TG off
TG off
20.0MHz/div
20.0MHz/div
1s/div
1s/div
HARMONIC
2ND
OUT
RES bw 10MHz
VID bw 5.4kHz
RES bw 10MHz
VID bw 5.4kHz
HARMONIC
3RD
= 60 MHz,
REV. C