Specifications

27
Wireless Connectivity Guide Texas Instruments 4Q 2014
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PurePath™ Wireless Audio
PurePath™ Wireless Audio Overview
PurePath™ Wireless Audio
By employing proprietary technology
called PurePath Wireless, the CC85xx
device family provides robust, high-
quality, short-range 2.4-GHz wireless
digital audio streaming in low-cost,
single-chip solutions.
Two or more devices form a PurePath
Wireless audio network. Great care has
been taken to ensure that this audio
network provides gap-less and robust
audio streaming in varied environments
and that it can coexist with existing
wireless technologies in the crowded
2.4-GHz ISM band.
Most applications can be implemented
without any software development
and only require the CC85xx to be
connected to an external audio source
or sink (such as an audio codec,
S/PDIF interface or class-D amplifier)
and a few push buttons, switches or
LED for human interaction. Advanced
applications can interface a host
processor or DSP directly to the
CC85xx and directly stream audio
and control most aspects of device
and audio network operation.
Wireless headphone/headset design
•Cost-optimizeddesignwith100%
TI content
•2×longerbatterylifethantypical
headphone (22hr on 465mah battery)
•Wellsuitedforhigh-quality 
headphones/headsets
•DesignfilesavailablefromTI
The PurePath Wireless Configurator,
a PC-based configuration tool, is used
to set up the desired functionality and
parameters of the target system and
then produces firmware images that
subsequently must be programmed
into the embedded Flash memory of
each CC85xx.
All devices in the CC85xx family
interface seamlessly with the CC2590
RF range extender device to allow for
even wider RF coverage and improved
robustness in difficult environments.
Built-in wireless audio protocol with
excellent robustness and coexistence
through multiple techniques:
• Adaptivefrequencyhopping
• Forwarderrorcorrection
• Bufferingandretransmission
• Errorconcealment
• Optionalhigh-qualityaudio
compression
Digital audio support
• CD-qualityuncompressedaudio
(44.1/48 KHz, 16/24 bits)
• DigitalI
2
S audio interface supports
1–2 audio channels (CC852x) or
3–4 audio channels (CC853x) at
sample rates of 32, 40.275, 44.1 and
48-kHz/16-bit word-widths
• Audiolatencylessthan20ms
• Dataside-channelallowsdatatobe
sent alongside the audio between
external host controllers
Application areas
• Wirelessheadphones/headsets
• Wirelessspeakersystems
• Wirelesssignalcablereplacement
• Wirelesshometheatresystems
Wireless 25W Li-ion powered
speaker design
• UsesCC8520,TAS5727,BQ24610
(Li-Ion charger), LM2842Y
(step-down DC/DC)
• Targets~20hplayback(2aHr@CD
quality)
• WellsuitedforPC/portablespeakers
• iPhoneRCapplicationavailable
(with Bluetooth low energy)