XE1203F datasheet(14/36 Pages) SEMTECH

Part #	XE1203F

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

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Manufacturer	SEMTECH [Semtech Corporation]

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XE1203F

Figure 8: Modulation with and without pre-filtering

The main characteristic of this pre-filtering function is the ratio between the rise/fall time to the bit duration, trise/tbit.

The value of this ratio can be programmed between two pre-defined values in the RTParam_Stair configuration bit,

as shown in the Table 7.

RTParam_Stair

trise/tbit

0

10%

1

20%

Table 7: trise/tbit ratio

When the pre-filtering function is enabled (RTParam_Filter set to “1”), only the following bit rates and frequency

deviations can be used:

FSParam_Dev

Frequency deviation

00101000

00110111

01010000

10100000

11001000

40 kHz

55 kHz

80 kHz

160 kHz

200 kHz

No filtering

Staircase filtering

Datain or

data

INfreq_synth

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