VCA8617

SBOS308B − AUGUST 2004 − REVISED NOVEMBER 2004

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12

At TA = +25°C, load resistance = 1kΩ on each output to ground, unless otherwise noted. The input to the preamp (LNA) is single-ended; pre-amp

gain is fixed at +20dB, fIN= 2MHz, PG = 01, ATN = 00, and the output from the VCA is differential, unless otherwise noted.

1100

1000

900

800

700

600

500

400

300

200

100

0

OUTPUT−REFERRED NOISE vs VCA

CNTRL

(ATN = 11, f

VCA

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

PG = 01

PG = 00

PG = 11

PG = 10

80

70

60

50

40

30

20

10

0

INPUT−REFERRED NOISE vs VCA

CNTRL

(ATN = 11, f

VCA

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

PG = 00

PG = 01

PG = 10

PG = 11

70

60

50

40

30

20

10

0

INPUT−REFERRED NOISE vs VCA

CNTRL

(ATN = 11, f

VCA

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

PG = 11

PG = 10

PG = 01

PG = 00

60

55

50

45

40

35

30

25

20

NOISE FIGURE vs VCA

CNTRL

(ATN = 11, f

VCA

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

PG = 00

PG = 01

PG = 10

PG = 11

55

51

47

43

39

35

31

27

23

17

NOISE FIGURE vs VCA

CNTRL

(ATN = 11, f

VCA

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

PG = 00

PG = 01

PG = 11

PG = 10

1.25

1.20

1.15

1.10

1.05

1.00

INPUT−REFERRED NOISE

Gain Setting

PG 00

PG 01

PG 11

PG 10

AT00

AT11