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| 型号： | SM1230E868 |
| 厂商： | Semtech |
| 文件页数： | 4/46页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL XMITTER FOR SX1230 |
| 设计资源： | SM1230 BOM SX1230 Eval Board Schematic |
| 标准包装： | 1 |
| 类型： | 发射器 |
| 频率： | 868MHz |
| 适用于相关产品： | SX1230 |
| 已供物品： | 板 |
| 产品目录页面： | 584 (CN2011-ZH PDF) |
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SX1230
Integrated Transmitter IC
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
This product datasheet contains a detailed description of the SX1230 performance and functionality. Please consult the
Semtech website for the latest updates or errata (www.semtech.com).
1. General Description
The SX1230 is a multi-band, single chip transmitter IC capable of (G)FSK, (G)MSK, and OOK modulation of an input data
stream. It can transmit this modulated signal in any of the license free ISM bands from 290 MHz to 1020 MHz.
1.1. Simplified Block Diagram
VBAT
VR_DIG
VR_ANA
RESET
TEST
VR_PA
Power Distribution
E2_MODE
RFOUT
PA1
Div 2/4/6
RC Oscillator
GND
Ramp and
Control
Interpolation
and Filtering
Modulator
DATA
DCLK
PLL_LOCK
PA2
Fractional-N
PLL
Calibration
NSS
MISO
Registers
and SPI
÷R
XTAL
Switch I/P
Interface
MOSI
SCK
CLKOUT
XTA
XTB
PB(3:0)
Figure 1. SX1230 Simplified Block Diagram
The general architecture of the SX1230 is shown in Figure 1. The frequency synthesizer generating the LO frequency is a
third-order fractional-N sigma-delta PLL. The PLL is capable of fast auto-calibration and offers fast switching and settling
times. For frequency modulation ((G)FSK and (G)MSK), the modulation is performed within the PLL bandwidth. Optional
pre-filtering of the bit stream may also be enabled to reduce the power delivered to adjacent channels.
Amplitude modulation (OOK), is performed via a DAC driving the reference of the regulator of the PA. Note that pre-filtering
of the bit stream is also available in this mode. The VCO works at 2, 4 or 6 times the RF output frequency to improve the
quadrature precision and reduce pulling effects during transmission.
The PA of the SX1230 is comprised of two amplifiers - one high power, one low power. This enables the SX1230 to deliver
a wide range, over 30 dB, of output powers - up to +13 dBm in single PA configuration. However, with an appropriate output
impedance transformation, in dual PA mode, this can be increased to +17 dBm.
SX1230, Revision 2 May 2009
?2008 Semtech Corp.
Page 4
www.semtech.com
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