AD8309 데이터 시트보기 (PDF) - Analog Devices

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AD8309

5 MHz–500 MHz 100 dB Demodulating Logarithmic Amplifier with Limiter Output

Analog Devices 

AD8309–Typical Performance Characteristics

100

10

1

0.1

0.01

0.001

+25؇C

+85؇C

–40؇C

0.0001

0.00001

0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5

ENABLE VOLTAGE – V

Figure 1. Supply Current vs. Enable Voltage @

TA = –40°C, +25°C and +85°C

VLOG

500mV PER

VERTICAL

DIVISION

GROUND REFERENCE

+10dBm INPUT

LEVEL SHOWN

HERE

100ns PER HORIZONTAL

DIVISION

500mV PER

VERTICAL DIVISION

Figure 4. RSSI Pulse Response for Inputs Stepped from

Zero to –63 dBV, –43 dBV, –23 dBV, –3 dBV

VLOG

500mV PER

VERTICAL

DIVISION

–13dBV

–33dBV

–53dBV

–73dBV

–93dBV

GROUND REFERENCE

ENBL

5V PER

VERTICAL

DIVISION

500ns PER HORIZONTAL

DIVISION

VLOG

500mV PER

VERTICAL

DIVISION

GROUND REFERENCE

100ns PER HORIZONTAL

DIVISION

INPUT

1V PER VERTICAL

DIVISION

Figure 2. Power On/Off Response Time with RF Input of

–93 dBV to –13 dBV

Figure 5. Large Signal RSSI Pulse Response with RL = 100 Ω

and CL = 33 pF, 100 pF and 330 pF (Curves Overlap)

VLOG

500mV PER

VERTICAL DIVISION

GROUND REFERENCE

INPUT

500mV PER

VERTICAL DIVISION

200ns PER HORIZONTAL

DIVISION

Figure 3. Large Signal RSSI Pulse Response with

CL = 100 pF and RL = 50 Ω and 75 Ω (Curves Overlap)

27pF

VLOG

200mV PER

VERTICAL DIVISION

GROUND REFERENCE

270pF

3300pF

100␮s PER

HORIZONTAL

DIVISION

Figure 6. Small Signal AC Response of RSSI Output with

External Filter Capacitance of 27 pF, 270 pF and 3300 pF

–4–

REV. B

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