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LOG305

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Low power, 95dB dynamic range, logarithmic detector

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Data sheet

LOG305

ACTIVE
Data sheet Order now

Product details

Offset voltage (input amplifiers) (max) (mV) 150 Vs (±) (min) (V) 2.7 Vs (±) (max) (V) 5.25 Iq (max) (mA) 1.8 Dynamic range (typ) (dB) 95 Reference type Ext, External Full-scale output voltage (min) (±V) 0.12 Full-scale output voltage (max) (±V) 5.05 Conformity error (initial 5 decades) (max) (%) 1.4 Conformity error (initial 5 decades) (typ. over temp) (%/°C) 2 Operating temperature range (°C) -40 to 125 Rating Catalog
Offset voltage (input amplifiers) (max) (mV) 150 Vs (±) (min) (V) 2.7 Vs (±) (max) (V) 5.25 Iq (max) (mA) 1.8 Dynamic range (typ) (dB) 95 Reference type Ext, External Full-scale output voltage (min) (±V) 0.12 Full-scale output voltage (max) (±V) 5.05 Conformity error (initial 5 decades) (max) (%) 1.4 Conformity error (initial 5 decades) (typ. over temp) (%/°C) 2 Operating temperature range (°C) -40 to 125 Rating Catalog
WSON (DRV) 6 4 mm² 2 x 2
  • Input Range: 18µVRMS to 1VRMS
  • Temperature: –40°C to +125°C
  • Dynamic range: 95dB
  • Log conformance error (LCE) = ±2dB
  • Signal detection from 200kHz to 100MHz
  • Quiescent current: 2.1mA max across temperature
  • Supply: 2.7V to 5.25V
  • Integrated Op Amp for buffering / gain adjustment
  • Input Range: 18µVRMS to 1VRMS
  • Temperature: –40°C to +125°C
  • Dynamic range: 95dB
  • Log conformance error (LCE) = ±2dB
  • Signal detection from 200kHz to 100MHz
  • Quiescent current: 2.1mA max across temperature
  • Supply: 2.7V to 5.25V
  • Integrated Op Amp for buffering / gain adjustment

The LOG305 is a Log Detector / RSSI Detector with very low power consumption. This device supports an input frequency from 200kHz to 100MHz and a typical dynamic range of 95dB. The LOG305 can support beyond these frequencies at reduced sensitivity. The LOG305 is intended for use in applications that require a wide dynamic range of voltage and signal measurement. This device supports single ended inputs and unipolar or bipolar supplies.

The LOG305 is available in a 6-pin DRV package. The LOG305 is operational from a 2.7V to 5.25V supply and over the full ambient temperature range of –40°C to +125°C.

The LOG305 is a Log Detector / RSSI Detector with very low power consumption. This device supports an input frequency from 200kHz to 100MHz and a typical dynamic range of 95dB. The LOG305 can support beyond these frequencies at reduced sensitivity. The LOG305 is intended for use in applications that require a wide dynamic range of voltage and signal measurement. This device supports single ended inputs and unipolar or bipolar supplies.

The LOG305 is available in a 6-pin DRV package. The LOG305 is operational from a 2.7V to 5.25V supply and over the full ambient temperature range of –40°C to +125°C.
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* Data sheet LOG305 95dB Dynamic Range, Logarithmic Detector for Cost-Sensitive Applications datasheet (Rev. A) PDF | HTML 18 Nov 2025
Application note Ultrasonic Sensing Using LOG Detector Amplifier PDF | HTML 01 Oct 2024

Design & development

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Evaluation board

LOG305DRVEVM — LOG305 evaluation module

The LOG305DRVEVM is the evaluation module for the LOG305 Log detector / RSSI Detector in the 6-pin WSON (DRV) 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 (2.7V to 5.25V), signal (...)
User guide: PDF | HTML
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Simulation model

LOG305 TINA-TI Reference Design

SLOM537.TSC (547 KB) - TINA-TI Reference Design
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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 (...)
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