SLOSEB7C September   2024  – September 2025 LOG300

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics Low Noise Amplifier (LNA) 
    6. 5.6 Electrical Characteristics Log Detector
    7. 5.7 Electrical Characteristics LNA + Log Detector (AFE)
    8. 5.8 Typical Characteristics: VCC = 5V
    9. 5.9 Typical Characteristics: VCC = 3.3V
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Offset Correction Loop (OCL)
      2. 7.3.2 Single and Differential Input
      3. 7.3.3 Input Frequency Detect
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Ultrasonic Distance Measurement
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Third-Party Products Disclaimer
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • RGT|16
  • D|16
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.3.1 Offset Correction Loop (OCL)

The LOG300 comes with an internal offset correction loop (OCL) designed to correct for any small offset voltage errors due to external factors or due to the internal gain mismatch. The LOG300 internal gain blocks offer very high gain; therefore, any small error voltage is sufficient to saturate the respective gain block resulting in degradation of dynamic range.

The Offset_Cap pin (see Section 6) sets the time constant of the OCL. Set the value of the OCL pole to less than the incoming signal frequency so that the OCL does not respond to the incoming signal. Use the following formula to calculate the value of COffset_Cap based on the frequency of the incoming signal.

Equation 1. C O f f s e t _ C a p   ( n F )   ≥   6000 F r e q u e n c y   o f   i n p u t   s i g n a l   ( k H z )

where

  • COffset_Cap is never less than 1nF. If the formula yields a value of COffset_Cap less than 1nF, use 1nF.
  • When the value of COffset_Cap is greater than the calculated value, using Equation 1 is acceptable because the OCL loop is set to a lower frequency.
  • If the frequency of the input signal is in kHz, then by default the COffset_Cap value is in nF.