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See Technical Specifications

TL441CN

Logarithmic amplifier with scale factor of 8 mV/decade

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

TL441CN
Datasheet:

TL441CN Datasheet (PDF)
Amplifier Type:

Logarithmic
Number of Circuits:

1
Current - Supply:

18.5mA
Current - Output / Channel:

30 mA
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TL441CN General Description

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 logarithm of the input voltage over the 30-dB input voltage range. Each half of the circuit contains two 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. The four stages may be interconnected to obtain a theoretical input voltage range of 120-dB. In practice, this permits the input voltage range typically to be greater than 80-dB with log linearity of ± 0.5-dB (see application data). Bandwidth is from dc to 40 MHz.

This circuit is useful in data compression and analog compensation. This logarithmic amplifier is used in log IF circuitry as well as video and log amplifiers.

The TL441 is characterized for operation over 0°C to 70°C.

Key Features

Excellent Dynamic Range
Wide Bandwidth
Built-In Temperature Compensation
Log Linearity (30-dB Sections).1 dB Typ
Wide Input Voltage Range

Specifications

Category	Integrated Circuits (ICs)LinearAmplifiersInstrumentation, OP Amps, Buffer Amps	Series	-
Amplifier Type	Logarithmic	Number of Circuits	1
Output Type	-	Slew Rate	-
Current - Supply	18.5mA	Current - Output / Channel	30 mA
Operating Temperature	0°C ~ 70°C	Mounting Type	Through Hole
Base Product Number	TL441