SX1257 Datasheet, PDF (1/38 Pages) Semtech Corporation – Low Power Digital I and Q RF Multi-PHY Mode Transceiver

SX1257
WIRELESS & SENSING PRODUCTS
SX1257 RF Front-End Transceiver
Low Power Digital I and Q RF Multi-PHY Mode Transceiver
DATASHEET
VBAT
VR_ANA1 VR_ANA2
VR_DIG
RF_IN
Power Distribution System
0 to -48 dB with 6 dB steps
0 to -30 dB with 2 dB steps
RX pre-filter
CT ΣΔ
RX pre-filter
CT ΣΔ
RESET
1b
I_OUT
1b
Q_OUT
ATT
RF_OP
RF_ON
Driver
Div by 2
Div by 2
Fractional-N
Frequency Synthesizer
Fractional-N
Frequency Synthesizer
TX Filter
DAC
TX Filter
DAC
MISO
MOSI
SCK
NSS
CLKIN
CLKOUT
1b
I_IN
1b
Q_IN
XO
36 MHz
XTA
XTB
GENERAL DESCRIPTION
The SX1257 is a highly integrated RF front-end to digital I
and Q modulator/demodulator Multi-PHY mode transceiver
capable of supporting multiple constant and non-constant
envelope modulation schemes. It is designed to operate
over the 862 - 960 MHz European, North American and
Japanese ISM (Industrial, Scientific and Medical) license-
exempt frequency bands. Its highly integrated architecture
allows for a minimum of external components whilst
maintaining maximum design flexibility. All major RF
communication parameters are programmable and most of
them can be dynamically set. The SX1257 offers support
for both narrow-band and wide-band communication
modes without the need to modify external components.
The SX1257 is optimized for low power consumption while
offering the provision for high RF output power and
channelized operation. TrueRF™ technology enables a
low-cost external component count whilst still satisfying
ETSI, FCC and ARIB regulations.
APPLICATIONS
Š IEEE 802.15.4g SUN Multi-PHY Mode Smartgrid
Š Cognitive / Software Defined Radio (SDR)
KEY PRODUCT FEATURES
Š Fully flexible I and Q modulator and demodulator
Š Half or full-duplex operation
Š Bullet proof RX LNA
Š Analog TX and RX pre-filtering
Š Programmable tap TX FIR-DAC filter
Š Linear TX amplifier for both constant and non-constant
envelope modulation schemes
ORDERING INFORMATION
Part Number
Temperature Range
SX1257IWLTRT
-40;+85 C
Qty. per Reel
3000
Package
MLPQW-32
Š Pb-free, Halogen Free
Š RoHS / WEEE compliant product
SX1257 Rev 1
February 2012 ©2012 Semtech Corp.
Page 1
www.semtech.com