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LOG300

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40MHz logarithmic detector with integrated low-noise amplifier

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Data sheet

LOG300

ACTIVE
Data sheet Order now

Product details

Vs (±) (min) (V) 3 Vs (±) (max) (V) 5.25 Iq (max) (mA) 7.2 Dynamic range (typ) (dB) 97 Reference type Ext, External Full-scale output voltage (min) (±V) 0.082 Full-scale output voltage (max) (±V) 4.7 Conformity error (initial 5 decades) (max) (%) 1 Conformity error (initial 5 decades) (typ. over temp) (%/°C) 1.1 Operating temperature range (°C) -40 to 125 Rating Catalog
Vs (±) (min) (V) 3 Vs (±) (max) (V) 5.25 Iq (max) (mA) 7.2 Dynamic range (typ) (dB) 97 Reference type Ext, External Full-scale output voltage (min) (±V) 0.082 Full-scale output voltage (max) (±V) 4.7 Conformity error (initial 5 decades) (max) (%) 1 Conformity error (initial 5 decades) (typ. over temp) (%/°C) 1.1 Operating temperature range (°C) -40 to 125 Rating Catalog
SOIC (D) 16 59.4 mm² 9.9 x 6 VQFN (RGT) 16 9 mm² 3 x 3
  • Input range:
    • LNA + Log Detector: 7µVP to 200mVP
    • Log Detector: 20µVP to 1.6VP
  • Adjustable output to input slope and response time
  • Supports single-ended and differential inputs
  • Dynamic range: 98dB with log conformance error (LCE) = ±1dB
  • Signal detection from 50Hz to 40MHz; even higher with reduced LCE
  • Input frequency detection, zero cross detect
  • Supply: 3V to 5.25V
  • Input range:
    • LNA + Log Detector: 7µVP to 200mVP
    • Log Detector: 20µVP to 1.6VP
  • Adjustable output to input slope and response time
  • Supports single-ended and differential inputs
  • Dynamic range: 98dB with log conformance error (LCE) = ±1dB
  • Signal detection from 50Hz to 40MHz; even higher with reduced LCE
  • Input frequency detection, zero cross detect
  • Supply: 3V to 5.25V

The LOG300 is an integrated analog front end (AFE) consisting of low-noise amplifier (LNA) and a Log Detector block. This device supports an input frequency range from 50Hz to 40MHz and a typical dynamic range of 98dB. The LOG300 is intended for use in applications that require a wide dynamic range of voltage and signal measurement. The Log Detector block of LOG300 supports both single-ended and differential inputs. The low input noise of the integrated LNA, allows measurement of signals as low as 7µVP. The transient output response can be adjusted by tuning the capacitor connected at the Log_Out pin. The integrated frequency detect feature of LOG300 enables users to extract input signal frequency and zero-crossing information.

The LOG300 is available in a 16-pin SOIC and 16-pin VQFN package. The LOG300 is operational from a 3V to 5.25V supply and over the full ambient temperature range of –40°C to +125°C.

The LOG300 is an integrated analog front end (AFE) consisting of low-noise amplifier (LNA) and a Log Detector block. This device supports an input frequency range from 50Hz to 40MHz and a typical dynamic range of 98dB. The LOG300 is intended for use in applications that require a wide dynamic range of voltage and signal measurement. The Log Detector block of LOG300 supports both single-ended and differential inputs. The low input noise of the integrated LNA, allows measurement of signals as low as 7µVP. The transient output response can be adjusted by tuning the capacitor connected at the Log_Out pin. The integrated frequency detect feature of LOG300 enables users to extract input signal frequency and zero-crossing information.

The LOG300 is available in a 16-pin SOIC and 16-pin VQFN package. The LOG300 is operational from a 3V to 5.25V supply and over the full ambient temperature range of –40°C to +125°C.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet LOG300 40MHz, 98dB Logarithmic Detector With Integrated Low-Noise Amplifier datasheet (Rev. C) PDF | HTML 22 Sep 2025
Application brief Improving Arc Fault Detection with Log Amplifier (Rev. A) PDF | HTML 31 Mar 2026
Application note Ultrasonic Sensing Using LOG Detector Amplifier PDF | HTML 01 Oct 2024
Certificate LOG300DEVM EU Declaration of Conformity (DoC) 24 Sep 2024

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LOG300DEVM — LOG300D evaluation module

<p>The LOG300D evaluation module (EVM) is the LOG300 amplifier in the 16-pin SOIC package. This EVM is designed to quickly and easily demonstrate the functionality and versatility of the amplifier. The EVM is ready to connect to power, signal sources and test instruments through the use of (...)

User guide: PDF | HTML
Not available on TI.com
Evaluation board

LOG300RGTEVM — LOG300 evaluation module in RGT 16-pin VQFR package

The LOG300 evaluation module is for the LOG300 logarithmic detector with integrated low noise amplifier in the 16-pin VQFR package. This evaluation module is designed to quickly and easily demonstrate the functionality and versatility of the device. The EVM is ready to connect to power (3V to (...)

User guide: PDF | HTML
Not available on TI.com
Simulation model

LOG300 TINA-TI Model

SLOM524.ZIP (34 KB) - TINA-TI Spice Model
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
User guide: PDF
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Reference designs

TIDA-010971 — AC arc fault detection with edge AI for circuit breakers reference design

This reference design features an analog front end that enables AC arc fault detection. An AI model runs on an embedded microcontroller. Multiple sensing channels evaluate AI arc fault detection through current filters, voltage sensing, and log detection for high frequency arc energy. A PCB (...)
Design guide: PDF
Reference designs

TIDA-010987 — Rogowski coil current sensor reference design

This reference design enables end users to evaluate PCB Rogowski coils of different sizes and sensitivities for a wide range of current-sensing applications. The design supports low and high current measurements up to 500A, high precision at 0.2%, and wide bandwidth sensing exceeding 1MHz. The (...)
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Package Pins CAD symbols, footprints & 3D models
SOIC (D) 16 Ultra Librarian
VQFN (RGT) 16 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

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