BM83 datasheet(36/74 Pages) MICROCHIP

36 / 74 page

Transceiver

The BM83 module is designed and optimized for the Bluetooth 2.4 GHz system. It contains a complete RF

Transmitter (TX)/Receiver (RX) section. An internal synthesizer generates a stable clock for synchronizing with

another device.

4.1

Transmitter

The IS2083BM device has an internal Medium Power Amplifier (MPA) and a Low Power Amplifier (LPA). The MPA

supports up to +11 dBm output power for Bluetooth Class1 applications, and the LPA supports +1 dBm output power

for the Class 2 applications. The transmitter performs the I/Q conversion to minimize the frequency drift.

4.2

Receiver

• The Low-Noise Amplifier (LNA) operates with TR-Combined mode with LPA for single port application. It

removes the need for an external TX/RX switch.

• The ADC is used to sample the input analog signal and convert it into a digital signal for demodulator analysis. A

channel filter has been integrated into the receiver channel before the ADC, which is used to reduce the external

component count and increase the anti-interference capability.

• The image rejection filter is used to reject the image frequency for low-Intermediate Frequency (IF) architecture

and to reduce external Band Pass Filter (BPF) component for a super heterodyne architecture.

• Received Signal Strength Indicator (RSSI) signal feedback to the processor is used to control the RF output

power to make a good trade-off for effective distance and current consumption.

4.3

Synthesizer

A synthesizer generates a clock for radio transceiver operation. There is a Voltage-Controlled Oscillator (VCO) inside

with a tunable internal LC tank that can reduce variation for components. A crystal oscillator with an internal digital

trimming circuit provides a stable clock for the synthesizer.

4.4

Modem

• For Bluetooth 1.2 specification and below, 1 Mbps is the standard data rate based on the Gaussian Frequency

Shift Keying (GFSK) modulation scheme. This BR modem meets BDR requirements of Bluetooth 2.0 with EDR

specifications.

• For Bluetooth 2.0 and above specifications, EDR is introduced to provide the data rates of 1/2/3 Mbps.

• For baseband, both BDR and EDR utilize the same 1 MHz symbol rate and 1.6 kHz slot rate.

• For BDR, symbol 1 represents 1-bit. However, each symbol in the payload part of EDR packet represents 2/3

bits. This is achieved by using two different modulations – π/4 Differential Quadrature Phase Shift Keying

(DQPSK) and 8-Differential Phase Shift Keying (DPSK).

4.5

Adaptive Frequency Hopping

The BM83 module has an AFH function to avoid RF interference. It has an algorithm to check the nearby interference

and to choose clear channel for transceiver Bluetooth signal.

BM83

Transceiver

Preliminary Datasheet

DS70005402A-page 36

BM83 Datasheet(PDF) 36 Page - Microchip Technology

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