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Wireless Headset

Block diagram (SBD) for Wireless Headset using TI’s Low Power Wireless RF Transceiver, Low Power Audio Processing Codecs, Low Power Amplifiers, Li-Ion Power Management

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AC/DC Adaptor

Design Considerations

The consumer electronics market is trending towards “cutting the cord” on traditional wired products. Adding flexible wireless features to headsets gives the user increased mobility whether using the headset for business or leisure. Customers demand high sound quality and longer range coupled with all-day battery life. An integrated solution from TI takes into account the cost sensitivities of the consumer electronics market and provides a simple way to get products to market faster.

RF

High packet loss and signal interference contribute to degraded audio performance in applications seeking to deliver an uncompressed data stream. The CC8520 PurePath™ 2.4GHz SoC seamlessly integrates wireless streaming audio into the application. A 5Mbps data rate and built-in software protocol that includes: adaptive frequency hopping, forward error correction and buffering ensure a high integrity audio stream. Adding the CC2590 RF Front End boosts the range to 35m and improves signal penetration. The 8051 processor in the CC8520 reduces total system costs by eliminating the need for an external MCU to configure the audio converter.

Audio Processing

Low-power and low-noise audio performance are realized by integrating the AIC3254. The AIC3254's miniDSP enables product differentiation by integrating higher complexity sound processing algorithms such as advanced filtering and active noise cancellation. The AIC3254 includes an on-chip PGA for microphone input, a LDO for power supply filtering and a programmable PLL for synchronization.

Power

Extending device runtime is a primary concern in mobile systems design. For single-cell Li-Ion powered applications, devices such as the TPS65720 integrate a Li-Ion battery charger with Dynamic Power Path Management (DPPM) that provide power to the system during the battery charge cycle. The TPS65720 also integrates an on-chip buck converter, power-save modes and a general purpose 200mA LDO in a WCS or QFN package to conserve board space.

An alkaline battery source combined with a boost converter provides a simple and cost effective power scheme. TI boost converters, such as the TPS61220, are a good fit for alkaline battery applications and deliver a clean stable output as the alkaline input rail degrades.

    

Reference Designs

Description Part # Company
CC85XX-CC2590EM Reference Design CC85XX-CC2590EM-RD Texas Instruments
CC85XXEM Reference Design CC85XXEM-RD Texas Instruments
PurePath Wireless Headset Reference Design CC85XXDK-HEADSET-RD Texas Instruments

Tools and Software

Name Part # Company Software/Tool Type
BQ24072 USB Li-Ion Battery Charger and Power-Path Management Evaluation Module | Linear BQ24072EVM Texas Instruments Evaluation Modules & Boards
Coefficient Calculator For Digital Biquad Filters COEFFICIENT-CALC Texas Instruments Calculation Tools
PurePath Wireless Configurator PUREPATH-WL-CFG Texas Instruments SW Development Tools, IDEs, Compilers
PurePath Wireless Development Kit CC85XXDK Texas Instruments Development Kits
PurePath Wireless Headset Development Kit CC85XXDK-HEADSET Texas Instruments Evaluation Modules & Boards
PurePath™ Studio Graphical Development Environment AICPUREPATH_STUDIO Texas Instruments SW Development Tools, IDEs, Compilers
Quick Search Selection Tool for Audio AUDIO_SELECTION_TOOL Texas Instruments Calculation Tools
SmartRF Studio SMARTRFTM-STUDIO Texas Instruments Calculation Tools
Software Drivers for Audio Converters CODECDRIVERS-SW Texas Instruments Circuit Design & Simulation
TLV320AIC3254 Evaluation Module (EVM) and USB motherboard TLV320AIC3254EVM-K Texas Instruments Evaluation Modules & Boards
TPS65720/1 EVM Evaluation Software TPS65720_1EVM-SW Texas Instruments Application Software & Frameworks

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