XE1202A データシートの表示（PDF） - Semtech Corporation

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XE1202A

433 MHz / 868 MHz / 915 MHz Low-Power, Integrated UHF Transceiver

Semtech Corporation 

XE1202A TrueRF™

RTParam_FEI

en

Dfefdmeomdoudla_toeudt

data

datain

counter_out

DataOut_FEI

BIT B0 BIT B0+1 BIT B0+2 BIT B0+3 BIT B0+4

0

N

X

N

TS_FE

Figure 5: Timing diagram of an FEI measurement when “RTParam_Fsel” = 0

(the number of transitions on “counter_out” is for illustration only)

4.1.5 Transmitter

The output power of the power amplifier is programmable on four values with the register “RTParam_Tpow” (see

the Configuration register section below), as shown in the table below, where RFOP values are given in Electrical

Specifications section.

RTParam_Tpow

00

01

10

11

Output power

RFOP1

RFOP2

RFOP3

RFOP4

Table 8: output power settings

The degree of filtering of the baseband data prior to the modulation of the LO carrier frequency is programmable

via the RTParam_Filter register:

- the input bit stream is directly applied to the frequency synthesizer without any pre-filtering

(RTParam_Filter=0)

- the input bit stream is pre-filtered before being applied to the frequency synthesizer; with this filtering, each

edge of the bit stream is linearly smoothed with a staircase transition (RTParam_Filter=1)

This is illustrated in Figure 6, where DATAIN is the input bit stream to be transmitted:

© Semtech 2006

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