8 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

8.1 Application Information

The LOG300 is a good fit for multiple applications involving ultrasound receive signal measurement, power,

and energy measurements. The wide dynamic range and high input sensitivity makes the LOG300 an excellent

option for applications such as the example in Section 8.2.1 involving measurement of low amplitude signals

without the need of expensive, high-bandwidth, low-noise components.

8.2 Typical Application

8.2.1 Ultrasonic Distance Measurement

This design example demonstrates the circuit calculations and discrete component selection around the LOG300

to achieve a highly sensitive receive signal chain for a typical ultrasonic distance based measurement sensor.

Vbias

Log Detector

Inverting

Buffer

Buffer

VCC

LNA_En

Ultrasonic

Sensor

Ultrasonic

Driver

AFE_En

DET

Obstacle

RS

GND

Offset_Cap

Rbias

GND

Inv_Buffer

Buffer

Freq_Out

External BPF

GND

CF

RF

LNA_Out

Log_In

Log_Out

COffset_Cap

LNA

330pF

70µH

1nF

GND

Figure 8-1. Ultrasonic Distance Sensor

8.2.1.1 Design Requirements

Table 8-1. Design Parameters

PARAMETER

VALUE

Supply (VCC)

5V

Minimum input signal measuring capability

7µVP

Maximum input signal measuring capability: Linear

200mVP

Maximum input signal handling capability (Vmax)

100VP

Frequency of Tx and Rx signal

1MHz

Log_Out; Output range

0.5V to 4.5V

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LOG300

SLOSEB7A – SEPTEMBER 2024 – REVISED OCTOBER 2024

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