LOG200RGTT

Overview

The LOG200RGTT is a high-speed precision logarithmic amplifier from Texas Instruments, designed for wide dynamic range current-to-voltage conversion. It features two logarithmic amplifiers and one high-precision differential amplifier within a VQFN-16 package. The device operates on single supplies of 4.5V to 12.6V or dual supplies of ±2.25V to ±6.3V. Key electrical parameters include a dynamic range of 160dB (rated) up to 180dB, a gain-bandwidth product of 60MHz, and an input bias voltage of -840µV. It supports operation temperatures from -40°C to +125°C with a typical operating supply current of 9.5mA.

Feature Summary

• Provides ultra-fast transient response for low current levels with rapid settling times across decade steps.
• Integrates a non-limited high-speed auxiliary amplifier configurable for differential outputs, filtering, or SAR ADC driving.
• Delivers high precision with maximum log consistency error of 0.2% over specified current ranges.

Applications

• Optical modules
• Data center interconnects
• Optical network terminal equipment
• Chemical/gas analyzers
• Erbium-doped fiber amplifiers

Procurement Notes

Verify the specific suffix 'RGTT' against official Texas Instruments documentation to confirm tape-and-reel packaging quantities and exact marking codes. Ensure compatibility with the LOG200EVM evaluation module for initial characterization. Confirm RoHS compliance status through the manufacturer's latest datasheet revision notes before finalizing procurement specifications.

Selection Notes

Select this component when designing systems requiring extreme dynamic range and fast settling times for photodiode or sensor signals. The integrated auxiliary amplifier simplifies interface design for analog-to-digital converters. Consider the VQFN-16 thermal performance and board layout requirements for optimal signal integrity in high-frequency applications.

Part Context

This part belongs to the LOG200 series of precision logarithmic amplifiers. It is distinct from the LOG300 series, which offers lower power consumption but reduced dynamic range. The LOG200 is optimized for high-performance optical sensing and industrial measurement applications where speed and linearity are critical constraints.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material. Verify pinout and functional compatibility if considering alternative logarithmic amplifiers from other manufacturers.