CSR8645 Low Power Bluetooth V4.0 Audio Amplifier Support aptX

(2 customer reviews)

In stock

SKU: 130287
  1. Improved Audio Quality.
  2. Music Enhancements.
  3. Module Version: V1.0
  4. Bluetooth Version: V4.0
  5. Power supply: 3.3-4.2V
  6. Working current:≤30mA


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Category: Bluetooth and NRF Modules
Tags: CSR8645 4.0, Bluetooth audio Amplifier

This Bluetooth Audio Module based on the CSR8645, with latest Bluetooth V4.0. It is an Intelligent wireless audio data transmission product, low price, and high-efficiency stereo audio wireless transmission. With this module, you will easy to make your music wireless transmission, mainly used for short-distance transmission of music, you can easily connect Bluetooth laptop, cell phone, PDA and other digital products connected devices for wireless transmission of music.

It has a total of 6 function keys which is  POWER-EN, PLAY, VOL+, VOL-, PREV, NEXT.
The key function is introduced as follows:
  1. POWER-EN: the switch control module when the switch, the toggle switch, when the POWER-EN is connected toBAT, module startup; When POWER-EN disconnect BAT, module shutdown, usually used when battery power. Adopting the module electrically powered, only the 10K POWER-EN series resistor connected to BAT, can realize the module electrically powered, usually used in the external power supply.
  2. PLAY: Play/Pause (short press), with the hang-up (by a long, time slightly longer), repairing (long press).
  3. VOL+: Volume plus.
  4. VOL-: the volume Minus.
  5. PREV: To the Previous Track.
  6. NEXT: To the Next Track.



Bluetooth Profiles:

  1. Bluetooth v4.0 specification support.
  2. HFP v1.6 wideband speech (HD voice ready).
  3. HSP v1.2.
  4. A2DP v1.2.
  5. AVRCP v1.4.
  6. Support for smartphone applications (apps).

Improved Audio Quality:

  1. 2-mic far-end audio enhancements.
  2. Near-end audio enhancements (noise suppression and AEQ).
  3. Wind noise reduction.
  4. Packet loss concealment.
  5. Bit error concealment.
  6. Automatic gain control and automatic volume control.
  7. Frequency expansion for improved speech intelligibility.
  8. mSBC codec support for wideband speech.

Music Enhancements:

  1. Configurable 5-band EQ for music playback (rock, pop, classical, jazz, dance etc).
  2. APTX, SBC, MP3, AAC, and Faststream decoder.
  3. Stereo widening (S3D).
  4. Volume Boost Additional Functionality Additional Functionality.
  5. Support for voice recognition.
  6. Support for multi-language programmable audio prompts.
  7. CSR’s proximity pairing and CSR’s proximity connection.
  8. Multipoint support for HFP connection to 2 handsets for voice.
  9. Multipoint support for A2DP connection to 2 A2DP sources for music playback.
  10. Talk-time extension.

Package Includes:

1 x CSR8645 4.0 Low Power Bluetooth Audio Amplifier Module.



Module Version


Bluetooth Version


Input Voltage (V)

3.3 ~ 4.2

Bluetooth protocol

HFP V1.6/A2DP V1.2/AVRCP V1.4/HSP V1.2

Working current (mA)


Standby Current (µA)


Operating Temperature (℃)

-40 ~ +80

Wireless transmission range (m)

> 10

Transmission power




Frequency Range (GHz)

2.4 ~ 2.480

Audio SNR (dB)


Length (mm):


Width (mm):


Height (mm):


Weight (g):


Shipping Weight 0.007 kg
Shipping Dimensions 7 × 5 × 2 cm
15 Days Warranty

This item is covered with a standard warranty of 15 days from the time of delivery against manufacturing defects only. This warranty is given for the benefit of Robu customers from any kind of manufacturing defects.  Reimbursement or replacement will be done against manufacturing defects.

What voids warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.

Based on 2 reviews

4.5 overall

Add a review

  1. sreeharipavithran@hotmail.com (verified owner)

    Connection diagram needed


  2. Vishal Chauhan (verified owner)

    Product arrived early..
    the sound is really awesome..
    Thanks robu.in and the seller of the product.

    Vishal Chauhan


IC datasheet

Questions and answers of the customers

    Hello, Actually, I have 2 questions for this sp... Read more
  1. 0 votes
    Q Hello, Actually, I have 2 questions for this specific or any bluetooth module. 1. Can this mo...... Read more answer now
    Asked by zakir.designer0708 on December 3, 2022 8:59 pm

    1. Yes, this module can communicate with both a... Read more

  2. WIll this drive a big senheiser hd206 or similar h... Read more
  3. 0 votes
    Q WIll this drive a big senheiser hd206 or similar headphones? Or does it need external amp? answer now
    Asked by Mahesh Vasudevan on March 11, 2020 11:07 pm

    No! You will need an external amplifier to ampl... Read more

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Country Of Origin: China