1 Features
• Input range:
– LNA + log detector: 7μVP to 200mVP
– Log detector: 20μVP to 1.6VP
• Adjustable output to input slope and response
time.
• Dynamic range: 98dB with log conformance error
(LCE) = ±1dB
• Signal detection up 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

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 of up-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.