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LOG300
  • LOG300
  • LOG300
  • LOG300
  • LOG300

LOG300

ACTIVE

40MHz logarithmic detector with integrated low-noise amplifier

Texas Instruments LOG300 Product Info

1 April 2026 3

Parameters

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

Package

SOIC (D)-16-59.4 mm² 9.9 x 6

Features

  • 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

Description

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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