Datasheet

TL441
LOGARITHMIC AMPLIFIER
SLVS328 – OCTOBER 2000
12
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
Output Voltage – V
10
– 4
10
–3
10
–2
10
–1
10
1
1
Input Voltage – V
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
TRANSFER CHARACTERISTICS
1 kΩ
910 Ω
V
CC +
= 4 V
V
CC –
= – 4 V
5 kΩ
1 kΩ
910 Ω
100 Ω
15 kΩ
2 kΩ 2 kΩ
20 kΩ
2 kΩ
Slope
5 kΩ
Input
Output
Z
Z
A1
A2
Y
Y
B1
B2
TL441
5 kΩ
Origin
100 Ω
+
–
+
–
+
–
V
CC +
= 4 V
V
CC –
= – 4 V
NOTES: A. Inputs 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 15. Logarithmic Amplifier With Input Voltage Range Greater Than 80 dB