AD640 datasheet(6/16 Pages) AD

Teilenummer	AD640

Bauteilbeschribung	DC-Coupled Demodulating 120 MHz Logarithmic Amplifier

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AD640

REV. C

–6–

INPUT LEVEL – dBm

–2.5

–2.0

0.5

–40

–0.5

0

–1.5

–1.0

–50

–30

–20

–10

0

30MHz

60MHz

90MHz

120MHz

AD640

VS = 5 VOLTS

TEMPERATURE = +25 C

Figure 10. AC Response at 30 MHz, 60 MHz, 90 MHz and

120 MHz, vs. dBm Input (Sinusoidal Input)

FREQUENCY – MHz

1.0

DC

30

0.95

0.90

0.85

0.80

60

90

120

150

Figure 11. Slope Current, IY, vs. Input Frequency

Figure 12. Baseband Pulse Response of Single AD640,

Inputs of 1 mV, 10 mV and 100 mV

+25 C

+125 C

–55 C

+125 C

–55 C

+25 C

+125 C

–55 C

INPUT LEVEL – dBm

–2.5

0

–50

0

–2.0

–1.5

–1.0

–5

0.5

–40

–30

–20

–10

+1

0

–1

–2

+125 C

+25 C

AD640

FREQUENCY = 60MHz

Figure 13. Logarithmic Response and Linearity at 60 MHz,

TA for TA = –55 C, +25 C, +125 C

INPUT FREQUENCY – MHz

90

80

0

120

10

20

100 110

89

87

86

85

84

88

30

40

50

60

70

80

90

83

82

81

Figure 14. Intercept Level (dBm) vs. Frequency

(Cascaded AD640s – Sinusoidal Input)

10

0%

5µs

20mV

100

90

Figure 15. Baseband Pulse Response of Cascaded

AD640s, Inputs of 0.2 mV, 2 mV, 20 mV and 200 mV

–Typical AC Performance Characteristics

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