Description 
    With excellent RF transmission and excellent voice processing functions, this module is suitable for high-quality Bluetooth headset, Bluetooth stereo speakers and car hands-free system, and Bluetooth network access devices. BTM4805C2X module is a multi-functional Bluetooth module, which adopts the CSR BC05MM chipset. BC5-MM is a kind of multi-functional programmable chipset solution. It can realizes highly integrated on-chip radio, base band, DSP, stereo CODEC, charger and SMPS etc.. The embedded Kalimba DSP core has open processor, and advanced audio decoding (MP3/AAC/AAC+), echo cancellation, noise reduction, etc..
BTM4805C2X module provides a high quality but low cost Bluetooth voice communication solution, and it is a best choice for the high quality single-track and stereo headphones design. The built-in DSP empowers hands-free echo elimination;the way of high integrated design reduces the number of components and BOM cost, improving the cost performance. It can also applied to car hands-free devices, VoIP handheld devices, music player devices, Bluetooth adapter, USB multimedia adapter etc..audio decoding(MP3/AAC/AAC+), echo cancellation, noise reduction, etc.
For universal high-end stereo Bluetooth headphones and Bluetooth car hands-free devices can be developed, users do not need to think about programming and consider the complex RF circuit.

Features 

1. Compatible with Bluetooth v3.0 +EDR specification 
2. Output power level: Class 2 
3. Built-in antenna 
4. Effective distance: 10M 
5. Working temperature: -25℃~+85℃ 
6. Built-in DSP echo cancellation chip
7. Echo cancellation function: Acoustic echo cancellation—linear echo cancellation of 25~35 db and side-tones cancellation of 52~65dB. It can cancel echo in 200ms, empowering clear and fluent meantime synchronous mutual voice communication.
8. Noise reduction: 18dB, ensure loud and clear sound
9. Left & right double tracks 
10. A/D, D/A: 72dB SNR, sampling rate: 8~11K

Applications: 

1. stereo headphones 
2. car hands~free devices 
3. Bluetooth audio adapter 
4. Bluetooth speaker 
5. car speaker system 
6. Portable navigation devices