BM62 datasheet(19/70 Pages) MICROCHIP

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DS60001403A - Page 19

BM62/64

3.0

TRANSCEIVER

The BM62/64 module is designed and optimized for

Bluetooth 2.4 GHz system. It contains a complete radio

frequency transmitter/receiver section. An internal syn-

thesizer 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 is used to sample the input analog signal and

convert it into digital signal for de-modulator 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

image frequency for low-IF architecture. This filter for

low-IF architecture is intented to reduce external Band

Pass Filter (BPF) component for super heterodyne

architecture.

Received Signal Strength Indicator (RSSI) signal feed-

back to the processor is used to control the RF output

power to make a good trade-off for effective distance

and current consumption.

3.3

Synthesizer

A 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 2 Mbps, 3

Mbps and 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 packet rep-

resents 2/3 bits. This is achieved by using two different

modulations, π/4 DQPSK and 8 DPSK.

3.5

Adaptive Frequency Hopping

(AFH)

The BM62/64 module has AFH function to avoid RF

interference. It has an algorithm to check the nearby

interference and to choose clear channel for

transceiver Bluetooth signal.

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