XE1203 データシートの表示（PDF） - Unspecified

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コンポーネント説明

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XE1203

433MHz / 868MHz / 915MHz Low-power, integrated UHF transceiver

Unspecified 

Data Sheet

XE1203

4.1.3 Demodulation chain

The demodulation part is composed of an FSK demodulator, a bit synchronizer, a barker decoder and a Pattern

Recognition block. The next figure shows the interaction between each block.

RTParam_Barker

pow

BARKER

DECODER

data

dclk

FSK

DEMODULATOR

data

RTParam_Bitsync

pow

BIT

SYNCHRONIZER

FSParam_BR

data

dclk

DATA

CONTROL

data

dclk

RTParam_Pattern

pow

PATTERN

RECOGNIZER

ADParam_Pattern

ADParam_Psize

ADParam_Ptol

pattern

Figure 1 Demodulation architecture.

4.1.4 Demodulator

The demodulator provides a bit stream from the received FSK modulated base band limited signals, I_lim and

Q_lim. If RTParam_bsync and RTParam_Barker bits are set low, i.e disabled, then the demodulator output is

directly connected to the DATA pin and the DCLK pin is set to low.

The modulation index required for proper operation of the demodulator is:

β

=

2⋅∆f

BR

≥ 2,

where ∆f corresponds to the frequency deviation and BR corresponds to the bit rate.

9

D0308-214

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