IS2064 datasheet(19/74 Pages) MICROCHIP

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Advance Information

DS60001409A - Page 19

IS2062/64

3.0

TRANSCEIVER

The IS2062/64 SoC is designed and optimized for

Bluetooth 2.4 GHz systems. It contains a complete

radio frequency transmitter/receiver section. An inter-

nal synthesizer generates a stable clock to synchronize

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 directly performs IQ conversion to min-

imize the frequency drift.

3.2

Receiver

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

combined 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 intended 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 an internal digital trimming cir-

cuit 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 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 packets represents 2-bit or 3-bit.

This is achieved by using two different modulations,

π/4 DQPSK and 8 DPSK.

3.5

Adaptive Frequency Hopping

(AFH)

The IS2062/64 SoC has an AFH function to avoid RF

interference. It has an algorithm to check the nearby

interference and to choose the clear channel for trans-

ceiver Bluetooth signal.

IS2062_64.book Page 19 Monday, May 16, 2016 6:05 PM

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