CSR8640 - Qualcomm
Qualcomm® BlueCore™
Audio Platform
Bluetooth dual-mode ROM
audio System on Chip (SoC)
Bluetooth® audio ROM platform with
Qualcomm® cVc™ technology for entry
level to mid-range audio products
Solution Highlights
The CSR8640 offers various capabilities
found in the CSR8670 SoC, including cVc
voice processing technology in a ROM-based
package, ideal for entry-level to mid-range
wireless audio products with support for
voice and music.
The CSR8640 is part of the CSR86xx portfolio,
a range of silicon platforms for wireless audio
applications which integrate a dual-mode Bluetooth
radio, a low power DSP, an application processor,
a battery charger, memory and various audio and
hardware interfaces into a single-chip solution.
Developed for entry-level to mid-range wireless audio
devices, the CSR8640 supports Bluetooth Advanced
Audio Distribution Profile (A2DP) decoding and cVc
audio processing technology to deliver high quality
voice and music capabilities in a cost-efficient ROMbased single-chip package. The battery charger
architecture enables the CSR8640 BGA to operate
independently from the charger supply, ensuring
dependable operation for all battery conditions.
The CSR8640 is an easy and cost-effective
platform for developing wireless audio products and
supports reduced development time. It is ideal for
stereo headphones, speakers, speakerphones and
Qualcomm BlueCore, Qualcomm cVc, and CSR8640 are products of Qualcomm Technologies International, Ltd.
Ideal for entry-level to mid-range
wireless audio products
The CSR8640 SoC has a reduced feature set supporting
the essential features expected from Bluetooth audio
products while providing cost efficiency for entry-level
Integrated single-chip solution
for smaller designs
Application processor, Bluetooth and Bluetooth low
energy radios, DSP and memory integrated into a single
SoC helps reduce system complexity and eBOM while
supporting small form factor designs.
No software development
Pre-loaded Bluetooth and audio applications allow
manufacturers to develop end-products without writing
code, while customization tools support quick modification
of device behaviour and user interface.
cVc 6th generation 2-mic audio
cVc technology is a suite of algorithms designed to work
on the transmit and receive path of voice calls to deliver
optimum voice quality on Bluetooth headsets, handsets,
hands-free devices, and automotive.
This material is subject to change without notice.
Bluetooth Audio Applications
Stereo Speakers
Stereo Headphones
Stereo Headsets
CSR8640 Block Diagram
Bluetooth 4.0 specification compliant
£ Flexible ROM-based platform with fully
configurable MMI and tool chain
£ Support for various profiles including:
HFP 1.6, A2DP 1.2 AVRCP 1.4
£ 80MHz Qualcomm® Kalimba™ DSP with
integrated multipoint A2DP and HFP audio
£ £
2-mic cVc 6th Generation voice processing
technology with wideband speech
Audio tuning suite with audio
enhancements and 5-band EQs
£ Internal ROM, serial flash memory and
EEPOM interfaces
£ MP3, AAC and SBC audio codecs
CSR8640 Specifications
GAIA V1 and associated Android and iOS
apps for connectivity with mobile devices
£ £ Reference speaker and headset
applications pre-loaded on the ROM
Fast charging support up to 200mA with
no external components
Integrated dual-mode radio and balun (50 Ω)
-92dBm (typical) receiver sensitivity; +9dBm transmitter power
Bluetooth v4.0 firmware
£ £
80MHz non-programmable RISC processor
for application code and user interface
Integrated non-programmable 24-bit fixed-point
80MHz Kalimba DSP
Pin compatible with CSR8645
£ Product
Part Number
CSR8640 BGA Dev Kit
CSR8640 BGA Dev Board
Battery Support &
Power Management Audio Interfaces
Physical Interfaces
To learn more visit:
qualcomm.com or
Packaging Li-Ion battery charger with support up to 200mA
2x high-efficiency switch-mode regulators with
1.8V & 1.35V outputs from battery supply
Stereo 16-bit ADC; up to 48kHz sampling frequency
Stereo 16-bit DAC; up to 96kHz sampling frequency
Microphone inputs: up to 2x analog or digital (MEMS)
I2S and PCM interfaces
Up to 22x GPIOs, USB2.0, I2C, SPI, UART
3x hardware LED controllers
Integrated ROM memory
56kB system MCU RAM
64k x 24-bit data & 12k x 32-bit program memory dedicated to DSP
5.5 x 5.5 x 1mm, 0.5mm pitch 68-ball VFBGA
Qualcomm Kalimba is a product of Qualcomm Technologies International, Ltd.
©2017 Qualcomm Technologies International, Ltd. All Rights Reserved. Qualcomm is a trademark of Qualcomm Incorporated, registered in the
United States and other countries. CSR, BlueCore, cVc and Kalimba are trademarks of Qualcomm Technologies International, Ltd., registered
in the United States and other countries. The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and
any use of such marks by Qualcomm Technologies International, Ltd. is under license. Other products and brand names may be trademarks or
registered trademarks of their respective owners.
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