BM63 datasheet(17/56 Pages) MICROCHIP

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DS60001431A-Page 17

BM63

3.0

TRANSCEIVER

The BM63 module is designed and optimized for Blue-

tooth 2.4 GHz system. It contains a complete radio fre-

quency transmitter/receiver section. An internal

synthesizer generates a stable clock for synchronizing

with another device.

3.1

Transmitter

The internal power amplifier (PA) has a maximum out-

put power of +4 dBm. This is applied for class 2 or class

3 radios without an external RF PA.

The transmitter performs IQ conversion to minimize the

frequency drift.

3.2

Receiver

The low-noise amplifier (LNA) operates with TR-com-

bined mode for single port application. It can save a pin

on package without having an external Tx/Rx switch.

The ADC can sample the input analog signal and con-

vert it into a digital signal for demodulator analysis. A

channel filter has been integrated into 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 fre-

quency for low-IF architecture. This filter for low-IF

architecture is intended to reduce external Band Pass

Filter (BPF) component for super heterodyne architec-

ture.

The Received Signal Strength Indicator (RSSI) signal

feedback to the processor is used to control the RF out-

put power to make a good trade-off for effective dis-

tance and current consumption.

3.3

Synthesizer

Synthesizer generates a clock for radio transceiver

operation. There is a VCO inside, with a tunable inter-

nal LC tank that can reduce variation for components.

A crystal oscillator with internal digital trimming circuit

provides a stable clock for synthesizer.

3.4

Modem

For Bluetooth 1.2 specification and below, 1 Mbps was

the standard data rate based on Gaussian Frequency

Shift Keying (GFSK) modulation scheme. This basic

rate modem meets Basic Data Rate (BDR) require-

ments of Bluetooth 2.0 with Enhanced Data Rate

(EDR) specification.

For Bluetooth 2.0 and above specifications, EDR has

been introduced to provide data rates of 3/2/1 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 packets represents 2 or 3 bits.

This is achieved by using two different modulations,

π/4 DQPSK and 8 DPSK.

3.5

Adaptive Frequency Hopping

(AFH)

The BM63 module has AFH function to avoid RF inter-

ference. It has an algorithm to check the nearby inter-

ference and to choose clear channel for transceiver

Bluetooth signal.

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