ADA4961 datasheet(10/25 Pages) AD

Part #	ADA4961

Description	Digitally adjustable gain

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Data Sheet

ADA4961

Rev. A | Page 9 of 24

0

500

1000

1500

2000

FREQUENCY (MHz)

0

5

10

15

20

25

GAIN = 15dB

GAIN = 8dB

GAIN = 0dB

Figure 10. Noise Figure vs. Frequency at 15 dB, 8 dB, and 0 dB Gain

Settings, 3.3 V, with Low-Pass Filter

0

500

1000

1500

2000

FREQUENCY (MHz)

–160

–155

–150

–140

–145

–135

–130

5V, GAIN = 15dB

5V, GAIN = 7dB

5V, GAIN = 0dB

3.3V, GAIN = 15dB

3.3V, GAIN = 7dB

3.3V, GAIN = 0dB

Figure 11. Noise Spectral Density vs. Frequency at 15 dB, 7 dB, and 0 dB

Gain Settings, 5.0 V, 3.3 V, with Low-Pass Filter

0

400

1000

1400 1600 1800

200

600

800

1200

2000

0

10

20

30

40

50

60

70

FREQUENCY (MHz)

5V, HP, AV15, 25°C

3.3V, LP, AV15, 25°C

5V, HP, AV0, 25°C

3.3V, LP, AV0, 25°C

5V, LP, AV15, 25°C

5V, LP, AV0, 25°C

Figure 12. OIP3 vs. Frequency at 15 dB and 0 dB Gain Settings, 5.0 V, 3.3 V,

with Low-Pass Filter

0

400

1000

1400 1600 1800

200

600

800

1200

2000

FREQUENCY (MHz)

0

10

20

30

40

50

60

70

5V, HP, AV15, –40°C

3.3V, LP, AV15,–40°C

5V, LP, AV15, –40°C

5V, HP, AV15, +25°C

3.3V, LP, AV15, +25°C

5V, LP, AV15, +25°C

5V, HP, AV15, +85°C

3.3V, LP, AV15, +85°C

5V, LP, AV15, +85°C

Figure 13. OIP3 vs. Frequency at Three Temperatures, Maximum Gain,

5.0 V, 3.3 V, with Low-Pass Filter

40

41

42

43

44

45

46

47

48

49

50

–2

–1

012

3456

TOTAL POWER (dBm)

500MHz

1000MHz

1500MHz

Figure 14. OIP3 vs. Total Power at Three Frequencies

FREQUENCY (MHz)

0

400

1000

1400 1600 1800

200

600

800

1200

2000

–160

–140

–120

–100

–80

–60

–40

–120

–100

–80

–60

–40

–20

0

5V, GAIN = 15dB

3.3V, GAIN = 15dB

5V, GAIN = 7dB

3.3V, GAIN = 7dB

5V, GAIN = 0dB

3.3V, GAIN = 0dB

5V

3.3V

Figure 15. IMD3 vs. Frequency at 15 dB, 7 dB, and 0 dB Gain Settings, 5.0 V,

3.3 V, with Low-Pass Filter,

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