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TL441 LOGARITHMIC AMPLIFIER
SLVS328 – OCTOBER 2000
D Excellent Dynamic Range D Wide Bandwidth
N PACKAGE (TOP VIEW)
D Built-In Temperature Compensation D Log Linearity (30-dB Sections) . . . 1 dB Typ D Wide Input Voltage Range
CA2 VCC –
CA2′ A1
1 2 3 4
16 NC
15 CB2 14 CB2′ 13 GND
description
Y5
12 B1
This amplifier circuit contains four 30-dB logarithmic stages. Gain in each stage is such that the output of each stage is proportional to the
Y A2 VCC +
6 7 8
11 Z 10 Z 9 B2
logarithm of the input voltage over the 30-dB input
voltage range. Each half of the circuit contains two
NC — No internal connection
of these 30-dB stages summed together in one
differential output that is proportional to the sum of the logarithms of the input voltages of the two stages.