AD641 AD [Analog Devices], AD641 Datasheet - Page 5

• Manufacturer Part Number: AD641
• Description: 250 MHz Demodulating Logarithmic Amplifier
• Manufacturer: AD [Analog Devices]

Figure 11. Intercept Level (dBm) vs. Frequency (Cascaded
AD641s—Sinusoidal Input)
REV. C
Figure 10. AC Response at 50 MHz, 150 MHz, 190 MHz,
210 MHz at 250 MHz, vs. dBm Input (Sinusoidal Input)
Figure 12. Baseband Pulse Response of Single AD641,
Inputs of 1 mV, 10 mV and 100 mV
–2.25
–2.00
–1.75
–1.50
–1.25
–1.00
–0.75
–0.50
–0.25
70.0
0.00
0.25
87.5
85.0
82.5
80.0
77.5
75.0
72.5
50
–52
–48 –44 –40
100
150
INPUT FREQUENCY – MHz
–36 –32 –28 –24 –20 –16 –12 –8
INPUT LEVEL – dBm
170
190
210
230
–4
Typical AC Performance Characteristics–
0
250
2
150MHz
50MHz
190MHz
210MHz
250MHz
–5–
Figure 15. Baseband Pulse Response of Cascaded AD641s
at Inputs of 0.2 mV, 2 mV, 20 mV and 200 mV
Figure 13. Logarithmic Response and Linearity at
200 MHz, T
Figure 14. Slope Current, I
–2.00
–1.75
–1.50
–1.25
–1.00
–0.75
–0.50
–0.25
–0.00
0.90
0.85
0.80
0.95
0.75
0.25
0.50
1.0
50
–52
+125 C
–55 C
100
–48 –44 –40
0%
90
10
–55 C
A
for T
150
+125 C
20mV
+25 C
5µs
+25 C
INPUT FREQUENCY – MHz
A
–36 –32 –28 –24 –20 –16 –12 –8
ERROR
= –55 C, +25 C, +125 C
OUTPUT
INPUT LEVEL – dBm
190
Y
, vs. Input Frequency
20mV
5µs
210
+125 C
+25 C
+25 C
–55 C
+125 C
AD641
–4
–55 C
0
250
2
5
4
3
2
1
0
–1
–2
–3
–4
–5