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Dual Automotive, Audio Line Drivers with I²C Control and Diagnostic

Automotive Audio Line Drivers Reliably Transport High-Quality Analog Audio Within a Vehicle

Product Details

The MAX13325/MAX13326 dual audio line drivers provide a reliable differential interface between automotive audio components. The devices feature differential inputs and outputs, integrated output diagnostics, and are controlled using an I²C interface or operate in stand-alone mode. The outputs can deliver up to 4VRMS into 100Ω loads.

The MAX13325 buffers analog audio signals for transmission over long cable distances with a fixed gain of 12dB, whereas the MAX13326 provides a 0dB fixed gain. The diagnostics on the outputs report conditions on a per channel basis, including short to GND, short to battery, overcurrent, overtemperature, and excessive offset. The output amplifiers can drive capacitive loads up to 4nF to ground and 3nF differentially.

The outputs are protected according to IEC 61000-4-2 ±8kV Contact Discharge, and ±15kV Air Gap. The MAX13325/MAX13326 are specified from -40°C to +105°C and are available in a 28-pin TSSOP package with an exposed pad.

Key Features

  • Comprehensive Programmability and Diagnostics Using I²C Interface
  • Autoretry Function in Stand-Alone Mode
  • Drive Capacitive Loads ≤ 3nF Differentially, ≤ 4nF to Ground
  • 112dB Signal-to-Noise Ratio
  • Low 0.002% THD at 4VRMS into 2.7kΩ loads
  • High PSRR (70dB at 1kHz)
  • High CMRR (80dB at 1kHz)
  • Low Output Noise (3µVRMS), MAX13326
  • Excellent Channel-to-Channel Matching
  • Load-Dump Transient Protection
  • Protected Output Against Various Short-Circuit Conditions
  • ESD Protection for ±8kV Contact Discharge, ±15kV Air Gap
  • Long-Distance Drive Capability Typically Up to 15m or Greater
  • Noise-Rejecting Differential Inputs and Outputs
  • Low-Power Shutdown Mode < 10µA
  • Hardware or Software MUTE Function
  • 28-Pin TSSOP Package with Exposed Pad

Applications/Uses

  • Automotive Radio and Rear Seat Entertainment
  • Professional Remote Audio Amplifiers

Simplified Block Diagram

MAX13325, MAX13326: Typical Operating Circuit MAX13325, MAX13326: Typical Operating Circuit Zoom icon

Technical Docs

Design & Development

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Description

The MAX13325 evaluation kit (EV kit) provides a proven design to evaluate the MAX13325 dual, audio line driver, which provides a robust differential interface between automotive audio components. The EV kit also includes Windows® 2000-, Windows XP®-, and Windows Vista®-compatible software that provides a simple graphical user interface (GUI) for exercising the features of the MAX13325.

The MAX13325 EV kit comes with a MAX13325GUI/V+ installed. Contact the factory for free samples of the pin-compatible MAX13326GUI/V+ to evaluate this device.

View Details

Features

  • Fully Differential Inputs and Outputs
  • Jumper-Selectable I²C Slave Address
  • On-Board USB Interface Circuit Generates I²C-Compatible Signals
  • PCB Pads for Audio Inputs and Outputs
  • PCB Pads for User-Supplied I²C-Compatible Signals
  • Windows 2000-, Windows XP-, and Windows Vista (32-Bit)-Compatible Software
  • USB-PC Connection (Cable Included)
  • Proven PCB Layout
  • Fully Assembled and Tested

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Support & Training

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Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal

Parameters

Key Features

  • Comprehensive Programmability and Diagnostics Using I²C Interface
  • Autoretry Function in Stand-Alone Mode
  • Drive Capacitive Loads ≤ 3nF Differentially, ≤ 4nF to Ground
  • 112dB Signal-to-Noise Ratio
  • Low 0.002% THD at 4VRMS into 2.7kΩ loads
  • High PSRR (70dB at 1kHz)
  • High CMRR (80dB at 1kHz)
  • Low Output Noise (3µVRMS), MAX13326
  • Excellent Channel-to-Channel Matching
  • Load-Dump Transient Protection
  • Protected Output Against Various Short-Circuit Conditions
  • ESD Protection for ±8kV Contact Discharge, ±15kV Air Gap
  • Long-Distance Drive Capability Typically Up to 15m or Greater
  • Noise-Rejecting Differential Inputs and Outputs
  • Low-Power Shutdown Mode < 10µA
  • Hardware or Software MUTE Function
  • 28-Pin TSSOP Package with Exposed Pad

Applications/Uses

  • Automotive Radio and Rear Seat Entertainment
  • Professional Remote Audio Amplifiers

Description

The MAX13325/MAX13326 dual audio line drivers provide a reliable differential interface between automotive audio components. The devices feature differential inputs and outputs, integrated output diagnostics, and are controlled using an I²C interface or operate in stand-alone mode. The outputs can deliver up to 4VRMS into 100Ω loads.

The MAX13325 buffers analog audio signals for transmission over long cable distances with a fixed gain of 12dB, whereas the MAX13326 provides a 0dB fixed gain. The diagnostics on the outputs report conditions on a per channel basis, including short to GND, short to battery, overcurrent, overtemperature, and excessive offset. The output amplifiers can drive capacitive loads up to 4nF to ground and 3nF differentially.

The outputs are protected according to IEC 61000-4-2 ±8kV Contact Discharge, and ±15kV Air Gap. The MAX13325/MAX13326 are specified from -40°C to +105°C and are available in a 28-pin TSSOP package with an exposed pad.

Simplified Block Diagram

MAX13325, MAX13326: Typical Operating Circuit MAX13325, MAX13326: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal