Speaker Dock

Audio Subsystem: Speaker Dock Solutions from Texas Instruments

Description

Notes: PCM1808 requires external mux for ≥ 2 inputs

The core subsystems include:

Portable Audio Converters with miniDSP

The miniDSP can support:

  • Branded third-party algorithms. SRS WOW-HD is a standard feature for all miniDSP devices with stereo DAC. • Due to resource limitations, complex compression algorithms such as AAC and MP3 are not supported.
  • Multiband DRC and speaker-protection algorithms to boost loudness and sound quality without damaging the speaker.

How to Use the miniDSP

Each miniDSP device can be programmed via a graphical-development-environment software called PurePath™ Studio. The software is loaded on a host PC and used to configure the codec and miniDSP and to create process flows. Predefined components are provided with a simple “drag/ drop” implementation of advanced audio processing flows. The miniDSP instruction memory is loaded with the customized desired algorithms over an I2C or SPI.

Medium- and High-Power, Analog-Input Class-D Speaker Amplifiers

Output Power per Channel

  • Maximum power is decided primarily by power supply (output voltage and current) and speaker impedance.
  • Efficiency of Class-D amplifiers is typically between 80% and 90%, which reduces demands on the power supply design.
  • The maximum input signal level dictates the required power amplifier gain to achieve the desired output power.
  • For best noise performance, the gain should be as low as possible.

Output Filter Design

  • Most of TI’s Class-D amplifiers operate without a filter when speaker wires are less than 10 cm.
  • When speaker wires are long, place a second-order low-pass (LC) filter as close as possible to the amplifier’s output pins.
  • The filter must be designed specifically for the speaker impedance because the load resistance affects the filter’s quality factor, or Q.
  • A ferrite bead may also eliminate very high-frequency interference.

Application notes & user guides

Application Notes (7)

Title Abstract Type Size (KB) Date Views
HTM 8 KB 07 Jun 2012 343
HTM 8 KB 18 Jun 2010 869
HTM 8 KB 24 May 2004 2113
HTM 8 KB 24 Jun 2002 73
HTM 8 KB 02 Oct 2000 2319
HTM 9 KB 24 Aug 1999 677
HTM 8 KB 23 Aug 1999 1018

User Guides (3)

Title Abstract Type Size (KB) Date Views
htm 8 KB 28 Apr 2009 131
pdf 676 KB 06 Aug 2006 497
pdf 757 KB 16 Jun 2006 363

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