SX1257 Ver la hoja de datos (PDF) - Semtech Corporation
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SX1257
Semtech Corporation
SX1257 Datasheet PDF : 38 Pages
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SX1257
WIRELESS & SENSING PRODUCTS
DATASHEET
1. General Description
The SX1257 is a single-chip Zero-IF RF-to-digital front-end transceiver integrated circuit ideally suited for today's high
performance multi-PHY mode or SDR ISM band RF applications. The SX1257 has a maximum signal bandwidth of 500
kHz in both transmission and reception and is intended as a high performance, low-cost RF-to-digital converter and
provides a generic RF front-end that allows several constant and non-constant envelope modulation schemes to be
handled, such as the MR-FSK, MR-OFDM and MR-O-QPSK PHYs of the IEEE 802.15.4g standard for Smart Utility
Networks (SUN) and Smartgrid applications in the 862 - 960 MHz license-exempt frequency bands.
The SX1257's advanced features set greatly simplifies system design whilst the high level of integration reduces the
external BOM to an optional RF power amplifier, and a handful of passive decoupling and matching components. A simple
4-wire 1-bit digital serial interface is provided for the baseband I and Q data streams to a baseband processor.
The SX1257 can operate in both half and full-duplex mode and is compliant with ETSI, FCC and ARIB regulatory
requirements. It is available in a MLPQ-W 5 x 5 mm 32 lead package.
1.1. Simplified Block Diagram
RF_IN
VBAT
VR_ANA1 VR_ANA2
Power Distribution System
0 to -48 dB with 6 dB steps
VR_DIG
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
CLK_IN
CLK_OUT
1b
I_IN
1b
Q_IN
XO
36 MHz
Figure 1. Block Diagram
XTA
XTB
SX1257 Rev 1
February 2012 ©2012 Semtech Corp.
Page 6
www.semtech.com
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