XE1283SKC433XE1 Semtech, XE1283SKC433XE1 Datasheet - Page 14

• Manufacturer Part Number: XE1283SKC433XE1
• Description: KIT STARTER FOR XE1283 433MHZ
• Manufacturer: Semtech
• Series: TrueRF™r
• Type: Transceiverr

Specifications of XE1283SKC433XE1

• Contents: Processor Boards, Modules, Batteries, Antennas, Serial Cable and Software CD
• For Use With/related Products: XE1283 (433MHz)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

XE1283
stream DATA and generates a synchronized clock DCLK to be used to sample the DATA signal easily without loading an
external processor with heavy signal processing. In addition, the receiver includes a Received Signal Strength Indicator
function (RSSI), a Frequency Error Indicator function (FEI) that gives indication about the frequency error of the local
oscillator, and pattern recognition function to detect programmable reference word in the incoming bit stream. A user-
selectable Barker coding/decoding block can be activated to spread the data with an 11-bit Barker code upon
transmission and decode the data upon reception by making a correlation between the spread data and the same 11-bit
Barker code. The bandwidth of the base-band filters, the frequency deviation of the expected incoming FSK signal as well
as the bit rate of this bit stream are programmable.
The transmitter performs the modulation of the carrier by an input bit stream and the transmission of the modulated
signal. The modulation is made directly through the frequency synthesizer. An on-chip power amplifier then amplifies the
signal. The output power is programmable among 4 possible values. The frequency deviation and the bit rate for the
transmit signal are the same as those programmed for the receiver section.
The frequency synthesizer generates the local oscillator (LO) signal for the receiver section as well as the FSK
modulated signal for the transmitter section. The core of the synthesizer is implemented with a Delta-Sigma PLL
architecture. The frequency is programmable with a step of 500 Hz in 3 frequency bands, 433-, 868-, and 915-MHz. This
section includes a crystal oscillator whose signal is the reference for the PLL. This reference frequency can also be used
as a reference clock for the external microcontroller through CLKOUT pin with a user selectable division ratio of 4,8,16 or
32.
The control block generates the control signals according to the setting in its set of configuration registers.
The service block performs all the necessary functions for the circuit to work properly, including the internal voltage and
current sources.
For more complete information please refer to the XE1203F datasheet [1]. This can be found on the website at
http://www.semtech.com
© Semtech 2005
www.semtech.com
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