AD8307_06 Datasheet, PDF (7/24 Pages) Analog Devices – Low Cost DC-500 MHz, 92 dB Logarithmic Amplifier

3.0
2.5
INT P_IN = 3.0V
10MHz, INT = –96.52dBm
2.0
INT P_IN = 4.0V
10MHz, INT = –87.71dBm
1.5
1.0
NO CONNECT ON INT
10MHz, INT = –82.90dBm
0.5
0
–80 –70 –60 –50 –40 –30 –20 –10 0 10 20
INPUT LEVEL (dBm)
Figure 9. VOUT vs. Input Level at 5 V Supply; Showing Intercept Adjustment
3.0
2.5
INT VOLTAGE
INT = 1.0V, INT = –86dBm
2.0
INT VOLTAGE
INT NO CONNECT, INT = –71dBm
1.5
1.0
0.5
INT VOLTAGE
INT = 2.0V, INT = –78dBm
0
–80 –70 –60 –50 –40 –30 –20 –10 0 10
INPUT LEVEL (dBm)
Figure 10. VOUT vs. Input Level at 3 V Supply Using AD820 as Buffer,
Gain = +2; Showing Intercept Adjustment
2.5
2.0
1.5
100MHz @ –40°C
1.0 100MHz @ +25°C
0.5
100MHz @ +85°C
0
–80
–60
–40
–20
0
20
INPUT LEVEL (dBm)
Figure 11. VOUT vs. Input Level at Three Temperatures (−40°C, +25°C, +85°C)
AD8307
3
100MHz
2
1
+INPUT
0
–1
–INPUT
–2
–3
–80
–60
–40
–20
0
20
INPUT LEVEL (dBm)
Figure 12. Log Conformance vs. Input Level at 100 MHz Showing
Response to Alternative Inputs
3
2
500MHz
1
0
–1 _100MHz
–2
–3
–90
–70
–50
–30
–10
10
INPUT LEVEL (dBm)
Figure 13. Log Conformance vs. Input at 100 MHz, 500 MHz;
Input Driven Differentially Using Transformer
3
2
500MHz
1
0
100MHz
–1
–2
10MHz
–3
–70 –60 –50 –40 –30 –20 –10 0
INPUT LEVEL (dBm)
10 20
Figure 14. Log Conformance vs. Input Level at 3 V Supply
Using AD820 as Buffer, Gain = +2
Rev. C | Page 7 of 24