LM745 Bluetooth Audio Module Onboard Antenna.

LM745 Bluetooth Audio Module Onboard Antenna for use with external Antenna is an integrated module which runs LM’s own tried and tested 5 Profile Stack, BT2.1 EDR or BT2.0 EDR CSR Firmware. Which covers HFP, A2DP, AVRCP, SPP, PBAP as standard. Handsfree 1.5 (HFP1.5), A2DP, PBAP firmware available and AT Command and PIO firmware options upon request.

LM745 Bluetooth audio module Onboard Antenna Class 2 uses a CSR Bluecore 5 IC as a core and is coupled with a, Embedded Kalimba DSP Co-Processor and a Integrated 16 bit Stereo Audio CODEC 95dB SNR for DAC, Integrated Switched-Mode regulator and 8MB flash memory


LM745 Bluetooth Audio Module Onboard Antenna

LM745 Bluetooth Audio Module Onboard Antenna will interface PCM, I²S, SPI and UART, and input making it compatible with most UART PCBA's. It is RoHs compliant and operates within -20◦c to +70◦c working temperature range and can be fitted with RF Shield upon request.

With a small foot print of just 16 mm x 15 mm x 2 mm this Bluetooth Audio Module Onboard Antenna fits into the smallest of spaces, LM offers free hardware design in and will certify this module to your PCBA for customers who exceed 2000 pieces per annum.

Ideally suited for use with a printed circuit antenna and Class 2 use or to be tracked for use with External Antenna applications this SMT Surface Mount Bluetooth Audio Module Onboard Antenna has a range of 40m range in open space.



  1. Bluetooth v2.0 + EDR compliant backward compatible with Bluetooth v1.2/1.1 specification
  2. Class 2 Radio with 25 m range in open space
  3. High Quality Audio Streaming
  4. Low Power Consumption
  5. Integrated Switched-Mode regulator
  6. Embedded Kalimba DSP Co-Processor
  7. Integrated 16 bit Stereo Audio CODEC 95dB SNR for DAC
  8. Lead free RoHS compliant
  9. 16MB flash memory Options
  10. AT Command firmware LM-SRX-ATC offers 5 profiles -HFP, A2DP, AVRCP, SPP, PBAP
  11. PIO firmware LM-RX-HIC offers 3 profiles - HFC, A2DP, AVRCP
  12. LM556 development kit for LM745 module available


  1. Excellent solution for Bluetooth Multimedia applications
  2. Fast Design In

Product Variants

Part NumberDescription
745-0420LM745 Bluetooth Audio Module Onboard Antenna

Product Specifications

LM745 Bluetooth Audio Module Onboard Antenna
ManufacturerLM Technologies Ltd
ChipsetCSR Bluecore 5 Multimedia External (BC05 MM Ext)
Power ClassificationClass 2
Module TypeSurface Mount - SMT
Bluetooth SpecificationCore v2.1 + EDR
Frequency2402 – 2480 MHz
Temperature Range-20 C to +70 C
Data RateUpto 3 Mbps in HCI Mode
Range40m in open space
Rx Sensitivity-82 dBm typical
AntennaOn- Board
Voltage operation1.8 – 3.6v
Current Consumption (standby mode)0.06 mA
Current Consumption (ACL Connection, master role)4.4 mA
Current Consumption (data transfer, master role)9.1 mA
Current Consumption (ACL Connection, slave role)15 mA
Current Consumption (data transfer, slave role)21 mA
Power Output+4 dBm
InterfaceUART, PIO, SPI
Digital Audio BusPCM, I²S or SPDIF
CodecYes, Integrated 16 bit stereo Audio CODEC
DSP ProcessorEmbedded Kalimba DSP Co-Processor
Flash Memory Intergrated16 MB
RoHS CompliantYes
Dimensions16mm x 23.9mm x 2.6mm

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DatasheetLM745 Bluetooth Audio Module Datasheet