SBOU301A July   2023  – January 2024 LOG200

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 Read this first: EVM Cleaning Guidelines
    2. 2.2 Input and Output Connections
    3. 2.3 Power Requirements
    4. 2.4 Jumper Information
    5. 2.5 Optional Photodiode Connections
  8. 3Hardware Design Files
    1. 3.1 Schematics
    2. 3.2 PCB Layout
    3. 3.3 Bill of Materials (BOM)
  9. 4Additional Information
    1. 4.1 Trademarks
  10. 5Revision History

1.1 Introduction

The LOG200EVM is the evaluation module (EVM) for the LOG200 precision, high-speed logarithmic amplifier. The device features two logarithmic amplifiers followed by a high-accuracy differential amplifier to convert current signals into a single-ended voltage that represents the log-compressed ratio of the two currents. The log amplifier ratio is internally set to 250 mV/decade of current-to-voltage conversion.

The LOG200 device integrates an uncommitted high-speed amplifier to allow the output to be configured for differential or filtered responses.

The LOG200EVM operates over a 4.5 V to 12 V range unipolar supply or dual supply of ±2.25V to ±6 V supply. See Table 3-2 for details. SMA and Test points provide convenient access to all critical functions of the LOG200.

Revision A / Revision E3 of LOG200EVM add a low-pass RC filter (R18, C12) between the VCM and REF25 connection through Jumper J8, and additional passive component footprints for flexibility. For a full schematic of the LOG200EVM and revision details, see Figure 4-1.