AD8331-EVAL datasheet(8/32 Pages) AD

Part #	AD8331-EVAL

Description	Ultralow Noise VGAs with Preamplifier and Programmable RIN

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AD8331/AD8332

Rev. C | Page 8 of 32

FREQUENCY (Hz)

–10

0

10

20

40

30

50

60

0.8V

0.6V

0.4V

0.2V

0V

1M

1G

100k

100M

10M

VGAIN = 1V

Figure 9. Frequency Response for Various Values of VGAIN, HILO = HI

–10

0

10

20

–40

30

–30

–20

1M

1G

100k

100M

10M

VGAIN =0.5 V

RIN =RS =50Ω,75Ω,100Ω

RIN =RS =1kΩ

RIN =RS = 500Ω

RIN =RS =200Ω

FREQUENCY (Hz)

Figure 10. Frequency Response for Various Matched Source Impedances

FREQUENCY (Hz)

–10

0

10

20

–40

30

–30

–20

1M

1G

100k

100M

10M

VGAIN = 0.5V

RFB = ∞

Figure 11. Frequency Response, Unterminated, RS = 50 Ω

FREQUENCY (Hz)

–70

0

–60

–50

–30

–40

–20

1M

100k

100M

10M

–10

–90

–80

0.7V

0.4V

0.9V

VGAIN = 1V

0.5V

VOUT = 1 V p-p

Figure 12. Channel-to-Channel Crosstalk vs.

Frequency for Various Values of VGAIN

FREQUENCY (Hz)

1M

100k

100M

10M

0

50

45

40

35

30

25

20

15

10

5

0.1

µF

COUPLING

1

µF

COUPLING

Figure 13. Group Delay vs. Frequency

1.1

0.4

0.2

0

0.3

0.1

0.9

0.7

0.5

0.8

0.6

1.0

–20

–10

0

10

20

–20

–10

0

10

20

T= +25

°C

LO GAIN

T= +25

°C

VGAIN (V)

HI GAIN

T= +85

°C

T= +85

°C

T = –40

°C

T = –40

°C

T = –40

°C

T= +25

°C

T= +85

°C

T = –40

°C

Figure 14. Representative Differential Output Offset Voltage vs. VGAIN at Three

Temperatures

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