TL441AMJB

Overview

The TL441AMJB is a monolithic logarithmic amplifier featuring four 30-dB stages for a theoretical 120-dB input range. It provides differential outputs proportional to the sum of logarithms of input voltages, with typical operation exceeding 80-dB range and ±0.5-dB log linearity. The device operates from DC to 40 MHz bandwidth. Electrical characteristics at ±6 V include a differential output offset voltage of ±70 mV max, quiescent output voltage of 5.85 V max, and supply current of 23 mA max from VCC+. Input impedance is 500 Ω, and output impedance is 200 Ω.

Feature Summary

• Contains four internal 30-dB logarithmic stages that can be interconnected to achieve wide dynamic range signal processing.
• Provides dual differential outputs (Y/Y and Z/Z) that are equal in amplitude but opposite in polarity for versatile circuit configurations.
• Includes built-in temperature compensation and detector compensation inputs to maintain log linearity across operating conditions.
• Features self-compensating differential input amplifiers that are relatively insensitive to common-mode noise.

Applications

• Military weapons systems
• Broadband radar
• Infrared reconnaissance systems
• Data compression
• Analog computation and compensation

Procurement Notes

Verify the specific ordering suffix matches the required military temperature range (-55°C to 125°C) and package type. Confirm RoHS status and lead finish details against the latest Package Option Addendum. Ensure compatibility with existing CDIP (J) footprint designs. Check for any recent design changes or reliability data updates in the production documentation before finalizing procurement specifications.

Selection Notes

Select this component when high dynamic range logarithmic amplification is required for RF or video signals. The device supports multiplication, division, and power functions through external resistor networks. Consider the 40 MHz bandwidth limit for frequency requirements. Verify that the ±6 V supply rails align with system power constraints. The J package requires appropriate thermal management given the dissipation ratings at elevated temperatures.

Part Context

The TL441AM is part of Texas Instruments' legacy logarithmic amplifier family, originally introduced in 1976. The AMJB variant denotes the military-grade version characterized for the full -55°C to 125°C temperature range. It utilizes a ceramic dual in-line package (CDIP) suitable for harsh environments. This component serves as a foundational building block for analog signal processing in defense and aerospace applications requiring precise log-linear response.

Replacement Considerations

Public confirmed substitute: 5962-9176301QEA. This part shares identical electrical specifications and pinout within the same military qualification standard. Verify package marking and traceability requirements match project needs.