TL441-EP_14 Datasheet, PDF (12/19 Pages) Texas Instruments – LOGARITHMIC AMPLIFIER

TL441ĆEP
LOGARITHMIC AMPLIFIER
SGLS268 − OCTOBER 2004
TRANSFER CHARACTERISTICS
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
10 ^{− 4} 10 ^−3 10 ^−2 10 ^−1
1
101
Input Voltage − V
1 kΩ
910 Ω
Input
100 Ω
VCC ₊ = 4 V
+
15 kΩ
−
VCC _− = − 4 V
5 kΩ
1 kΩ
910 Ω
VCC ₊ = 4 V
+
−
VCC _− = − 4 V
A1
Y
A2
Y
TL441
B1
Z
B2
Z
2 kΩ
Origin
20 kΩ
2 kΩ
2 kΩ
+
−
Slope
5 kΩ
Output
100 Ω
5 kΩ
NOTES: A. nputs are limited by reducing the supply voltages for the input amplifiers to ± 4 V.
B. The gains of the input amplifiers are adjusted to achieve smooth transitions.
Figure 14. Logarithmic Amplifier With Input Voltage Range Greater Than 80 dB
12
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