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RRD-303：

The RRD-303 Bluetooth-compatible module is a multi-functional wireless audio transmission product. It is a cost-effective stereo wireless transmission solution. The module uses the QCC3003 chip to provide high-quality sound quality and compatibility for the module, and the overall performance is superior.

Application areas:

The module is mainly used for short-distance music transmission, and can be conveniently connected with Bluetooth-compatible devices of digital products such as notebook computers, mobile phones, PDAs, etc., to realize wireless transmission and control of music. Applicable in BBluetooth-compatible audio. Bluetooth-compatible stereo headset, hands-free phone. Wireless transmission audio equipment.

Module hardware version: RRD-303 V 1 .0
Bluetooth specification: Bluetooth V5.0 π/4 DQPSK 8DPSK
Supply voltage: DC3.3V-4.2V
Support Bluetooth protocol: HFPV1.7 A2DPV1.3.1, AVRCPV1.6 HSP1.2
Current: ≤22mA during working playback
Connection does not play 30S after ≤ 5mA Shutdown: ≤ 30uA
Temperature range: -40 to +80 degree
Wireless transmission range ≥10M
Transmission power: CLASS2 0dBm
Sensitivity: -80dBm <0.1% BER
Frequency range: 2.402GHz-2.480GHz
External interface: Audio IN/OUT PIO SPI USB2.0
Audio performance: SBC, AAC, MP3 Stereo
Signal to noise ratio: ≥80dB
Module size: 17X12.7X2MM

The RRD-305：

The RRD-305 Bluetooth-compatible module is a multi-functional wireless audio transmission product. It is a cost-effective and cost-effective stereo wireless transmission solution. The module uses the QCC3005 chip to provide high-quality sound quality and compatibility for the module, and the overall performance is superior.

Second, the application area:

Basic characteristics:

Module hardware version RRD-305V1.0
Bluetooth specification Bluetooth V5.0 π/4 DQPSK 8DPSK
Supply voltage DC3.3V-4.2V
Support Bluetooth protocol HFPV1.7 A2DPV13.1, AVRCPV1.6 HSP1.2
Current working playback ≤22mA
After the connection does not play 30S: ≤ 5mA
Shutdown: ≤30uA
Temperature range -40°C to +80%C
Wireless transmission range ≥10M
Transmission power CLASS2 0dBm
Sensitivity -80dBm <0.1% BER
Frequency range 2.402GHz-2.480GHz
External interface Audio IN/OUT PIO UART USB2.0 SPI
Audio performance SBC, AAC, MP3 Stereo
Signal to noise ratio ≥ 80dB
Module size 25x13.5x2mm

RRD-5190L：

The RRD-5190L Bluetooth-compatible module is a versatile wireless audio transmission product. It is a cost-effective, cost-effective stereo/mono wireless transmission solution. The module provides high-quality sound quality and compatibility, and overall performance. More superior. And support music and ambience lights multiple device networking functions.

Application Area:

This module is mainly used for short-distance music transmission. It can be easily connected with Bluetooth-compatible devices of digital products such as laptops, mobile phones, PDAs, etc., to realize wireless transmission of music, control. Application in Bluetooth-compatible audio. Bluetooth-compatible stereo speakers, wireless transmission audio equipment. And optimize multiple speaker audio and data connection low latency algorithm. Applicable in the hotel lobby. Conference hall, large-scale multi-source synchronous low-power environment

Basic Characteristics:

Module hardware version RRD-5190L V1.0
Bluetooth-compatible Specifications Bluetooth-compatible V5.0 GFSK π/4 DQPSK 8DPSK
Supply voltage DC3.3V-5.0V
Support Bluetooth-compatible protocol A2DP V1.2
Current ≤122mA during operation
Shutdown: ≤30uA
Temperature range -40°C to +80°C
Wireless transmission range ≥10M between Bluetooth-compatible and mobile phone, ≥20M between main and auxiliary machines
Transmission power CLASS2 0dBm
Sensitivity -80dBm <0.1%BER
Frequency range 2.402GHz-2.480GHz
External interface Audio IN/OUT PIO USB2.0
Audio performance SBC, MP3 Stereo MONO
Signal to noise ratio 2 80dB
Module size 21X15.24X2MM

Circuit connection note:

During the application of the RRD-5190L module, please pay attention to avoiding the influence of interference sources such as power amplifier and booster line on the module, and avoid forming a series circuit between the power supply loop of the module and the high-power circuit unit, so as to improve the SNR of the whole machine.

Note:

Regarding the use environment of wireless Bluetooth-compatible, wireless signals, including Bluetooth-compatible applications, are greatly affected by the surrounding environment. Obstacles such as trees and metals will absorb wireless signals. In practical applications, the distance of data transmission is limited. influences.
The Bluetooth-compatible module must be equipped with an existing system and placed in the housing. Because the metal casing is shielded from the radio frequency signal. Therefore, it is not recommended to install it in a metal case.
PCB layout: The antenna part of the Bluetooth-compatible module is a built-in antenna. Since the metal will weaken the function of the antenna, when the module is laid, the bottom of the module is preferably hollowed out.