AD9853 datasheet(11/31 Pages) AD

Part #	AD9853

Description	Programmable Digital OPSK/16-QAM Modulator

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AD9853

–11–

REV. C

MAX CLOCK RATE – MHz

95

85

45

110 115

170

120 125 130 135 140 145 150 155 160 165

75

65

55

BIT RATE >2Mb/s

VCC = +5V

CONTINUOUS MODE

Figure 20. Max CLK Rate vs. Ambient Temperature

(To Ensure Max Junction Temp is Not Exceeded)

BIT RATE – Mb/s

2.6

1.2

0

0.5

3.5

1.0

1.5

2.0

2.5

3.0

2.4

2.0

1.8

1.6

1.4

2.2

VCC = +5.0V

CLK = 165MHz

CONTINUOUS MODE

VCC = +4.0V

Figure 21. Power Consumption vs. Bit Rate

BIT RATE – Mb/s

–45

–60

5.12

2.56

0.64

1.28

–50

–55

CLK = 122.88 MHz

VCC = +3.3V

–40

AOUT = 42MHz

AOUT = 32MHz

AOUT = 22MHz

AOUT = 12MHz

Figure 22. Spurious Emission vs. Bit Rate vs. AOUT

BIT RATE – Mb/s

0.80

0.75

0.55

01

6

23

4

5

0.70

0.65

0.60

CLK = 122.88 MHz

VCC = +3.3V

CONTINUOUS MODE

Figure 23. PWR Consumption vs. Bit Rate

BURST MODE DUTY CYCLE – %

2.4

1.9

0

20

100

40

60

80

2.3

2.2

2.1

2.0

2.5

CLK = 165MHz

VCC = +5.0V

BIT RATE = 3.4Mb/s

Figure 24. Power Consumption vs. Burst Duty Cycle

–40

–42

–52

3.5

1.75

0.44

0.88

–44

–46

–50

–48

BIT RATE – Mb/s

AOUT = 65MHz

AOUT = 40MHz

AOUT = 20MHz

CLK = 165MHz

VCC = +4.0V TO +5.0V

Figure 25. Spurious Emission vs. Bit Rate vs. AOUT

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