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LOG305 95dB Dynamic Range, Logarithmic Detector for Cost-Sensitive Applications

1 Features

•Input Range: 18µV

RMS

to 1V

RMS

•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

2 Applications

•Ultrasonic distance and material sensing

•Flow cytometry

•ESD and high energy EMI signal detection

•ARC fault detection

3 Description

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.

Package Information

PART NUMBERPACKAGE

(1)

PACKAGE SIZE

(2)

LOG305DRV (WSON, 6)2mm × 2mm

(1)For more information, see Section 11.

(2)The package size (length × width) is a nominal value and

includes pins, where applicable.

Log

Detector

Log_Out

Log_In

VEE

VCC

V

BIAS

1.7V

Opamp

Log_En

+

–

FB

96k



R

F

C

F

DET

90pF

V

DET

Logarithmic Detector

LOG305

SLOSEG0A – NOVEMBER 2025 – REVISED NOVEMBER 2025

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Produktspecifikationer