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LOG300 40MHz, 98dB Logarithmic Detector With Integrated Low-Noise Amplifier

1 Features

•Input range:

–LNA + Log Detector: 7µV

P

to 200mV

P

–Log Detector: 20µV

P

to 1.6V

P

•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

2 Applications

•Ultrasonic distance and material sensing

•Flow cytometry

•ESD and high energy EMI signal detection

•Energy detection

•Bubble, occlusion detection

LNA_In

Log_InandLog_Out

-0.20

00.5

0.21

0.41.5

0.62

0.82.5

13

LNA_In

Log_In

Log_Out

3 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 7µV

P

. 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.

Package Information

PART NUMBERPACKAGE

(1)

PACKAGE SIZE

(2)

LOG300

D (SOIC, 16)9.9mm × 6mm

RGT (VQFN, 16)3mm × 3mm

(1)For more information, see Section 11.

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

includes pins, where applicable.

External BPF

Log Detector

Inverting

Buffer

Buffer

Freq_Out

DET

Inv_Buffer

Buffer

GND

C

F

R

F

LNA

LNA_In

LNA_Out

Log_Inp

Log_Out

Sensor

Time

Time

Log_Inm

Logarithmic Detector and Envelope Detector

LOG300

SLOSEB7C – SEPTEMBER 2024 – REVISED SEPTEMBER 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