TL441CN Datasheet, PDF (9/20 Pages) Texas Instruments – LOGARITHMIC AMPLIFIER

APPLICATION INFORMATION
TL441
LOGARITHMIC AMPLIFIER
SLVS328 – OCTOBER 2000
output levels
Differential-output-voltage levels are low, generally less than 0.6 V. As demonstrated in Figure 12, the output
swing and the slope of the output response can be adjusted by varying the gain by means of the slope control.
The coordinate origin also can be adjusted by positioning the offset of the output buffer.
circuits
Figures 12 through 19 show typical circuits using this logarithmic amplifier. Operational amplifiers not otherwise
designated are TLC271. For operation at higher frequencies, the TL592 is recommended instead of the
TLC271.
TYPICAL TRANSFER
CHARACTERISTICS
1.4
1.2
Adjusted for Increased
1.0 Slope and Offset
0.8
0.6
0.4
0.2
0
Adjusted For Minimum
Slope With Zero Offset
– 0.2
10 ^{– 4} 10 ^–3 10 ^–2 10 ^–1
1
101
Input Voltage – V
Input
A1
Y
–+
1/2
TL441
A2 _GND Y
Origin
+
–
Slope
Output
Figure 12. Output Slope and Origin Adjustment
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