XE1205SKC433XE1 Semtech, XE1205SKC433XE1 Datasheet - Page 21

Manufacturer Part Number

XE1205SKC433XE1

Description

KIT STARTER FOR XE1205 433MHZ

Manufacturer

Semtech

Series

TrueRF™r

Type

Transceiver, ISMr

Datasheets

1.SX1211-11SKA868.pdf (2 pages)

2.XE1205SKC915XE1.pdf (48 pages)

Frequency

433MHz

For Use With/related Products

XE1205 (433MHz)

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

The Frequency Synthesizer generates the local oscillator (LO) signal for the receiver section as well as the continuous

phase FSK (CPFSK) modulated signal for the transmitter section. The core of the synthesizer is implemented with a

Sigma-Delta PLL architecture. The frequency is programmable with a step-size of 500 Hz in the 433, 868 and 915 MHz

frequency bands. This block includes a crystal oscillator which provides the frequency reference for the PLL. This

reference frequency can also be used as a reference clock for the external microcontroller on the CLKOUT pin.

5.4.1

A reference clock can be generated for use by an external microcontroller. The OSCParam_Clkout configuration bit

controls the CLKOUT pin. When set to high, CLKOUT is enabled, otherwise it is disabled. The output frequency at

CLKOUT is defined by the value of the OSCParam_Clkout_freq(2:0) parameter. The output frequency at CLKOUT is the

reference oscillator frequency divided by 2, 4, 8, 16 or 32. With a reference oscillator frequency of 39 MHz this provides

a reference clock at 19.5 MHz, 9.75 MHz, 4.87 MHz, 2.44 MHz or 1.22 MHz, respectively.

This clock signal is disabled in Sleep Mode.

5.4

FREQUENCY SYNTHESIZER

Clock Output for an external processor

XE1205

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