TL441-EP_14 Datasheet, PDF (5/19 Pages) Texas Instruments – LOGARITHMIC AMPLIFIER

VCC+ VCC−
TL441ĆEP
LOGARITHMIC AMPLIFIER
SGLS268 − OCTOBER 2004
18 mV DC
100 mV Power
560 mV Supply
CA2 CA2_′ VCC+ VCC−
A1
Y
A2
Y
B1
Z
B2
Z
CB2 CB2_′ GND
DVM
ƪ ƫ Vout(560 _{mV)–Vout(18mV)} mV
Scale Factor +
30 dBV
ƪ ƫ _{Vout(100 mV)–0.5} Vout(560 _mV)–0.5 Vout(18 _mV)
Error +
Scale Factor
Figure 3
VCC+ VCC−
Pulse
Generator
50 Ω
CI
Atten
100 mV
0 mV
CA2 CA2_′ VCC+ VCC−
A1
Y
A2
Y
B1
Z
B2
Z
CB2 CB2_′ GND
CL
1000 pF
Tektronix
Sampling Scope
With Digital
Readout or
Equivalent
CL
NOTES: A. The input pulse has the following characteristics: tw = 200 ns, tr ≤ 2 ns, tf ≤ 2 ns, PRR ≤ 10 MHz.
B. Capacitor CI consists of three capacitors in parallel: 1 µF, 0.1 µF, and 0.01 µF.
C. CL includes probe and jig capacitance.
Figure 4
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