收藏本站
SX1223
4
GENERAL DESCRIPTION
The SX1223 is a 2-level FSK transmitter. The circuit operates in one of two frequency ranges, 425 to 475 MHz, and
850 to 950 MHz, allowing the 3 main ISM frequency bands (434 MHz, 869 MHz and 915 MHz) to be addressed by
the circuit. It is capable of operating at data rates between 1.2 and 153.6 kbit/s, making it ideally suited for
applications where high data rates are required.
The SX1223 is a highly programmable device – channel, bit rate, frequency deviation and output power – which
makes it extremely flexible to meet a large number of end user requirements.
The main functional blocks of the SX1223 are the frequency synthesizer, the modulator, the power amplifier (PA),
the voltage regulators and some additional service blocks. The device also includes a set of configuration registers
and a digital interface. In a typical application, the SX1223 is programmed by a microcontroller via the 3-wire serial
bus SI, SO, SCK to write to and read from the internal registers.
The Frequency Synthesizer generates the carrier (the local oscillator (LO) signal).
The Modulator performs the modulation of the carrier by the input bit stream.
The Power Amplifier amplifies the modulated RF signal to the antenna port.
The Voltage Regulators generate regulated supply voltages for the different parts of the chip, and allow battery
voltages up to 3.6 V to be used.
The Service Blocks provide the internal voltage and current sources and provide all the necessary functions for the
circuit to work properly.
The Configuration Registers are a set of registers that are used to store various settings to operate the SX1223
transmitter circuit. Please refer to Section 5.2 for the detailed descriptions of these registers. These registers are
accessed in write or read mode through the 3-wire serial bus, as described in Section 5.1.
The Digital Interface provides internal control signals for the whole circuit according to the configuration register
settings.
4.1
FREQUENCY SYNTHESIZER
4.1.1 General Structure
The frequency synthesizer is an integer-N PLL and consists of a voltage-controlled oscillator (VCO), a crystal
oscillator, a prescaler, programmable frequency dividers and a phase-detector. The loop-filter is external for
flexibility and can be a simple passive circuit. The lengths of the M and N and A counters are respectively 12, 12
and 6 bits.
To enable the prescaler Prescal_s register (address 16, bit 4) has to be written to 1. The M, N and A values can be
calculated from the formula:
where
f XCO :
f RF :
FreqBand:
f RF =
Crystal oscillator frequency
RF frequency
0: RF frequency 425-475 MHz
f XCO
M ? ( 2 ? FreqBand )
( 16 ? N + A )
1: RF frequency 850-950 MHz
M is the divide factor applied to the reference frequency, N and A are the counters of the frequency divider in the
feedback loop of the PLL.
There are two sets of each of these divide factors (M0, N0, A0 and M1, N1, A1). In modulation modes mw1 and
mw2 (register bit Modulation1=0), only the M0, N0 and A0 are used to fix the carrier frequency. If modulation by
using the dividers is selected (mw3, Modulation1=1, Modulation0=0), the two sets are used to program the two RF
? Semtech 2007
7
www.semtech.com
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
SX1231-31SKB915 TVS
SX1240SKA433 TVS
SX1701BI085TRT IC AMP 2.5GHZ 5.3V 16-MLPQ
TA002-10002 LED HEATSINK W/FAN 12V 40X10MM
TC620HEPA IC TEMP SNSR 5V DUAL TRIP 8-DIP
TC623CVOA713 IC TEMP SNSR 3V DUAL TRIP 8-SOIC
TC624VOA IC TEMP SNSR PROG 2.7V 8SOIC
TC6501P125VCTTRG IC TEMP SWTCH OPEN DRAIN SOT23A5
相关代理商/技术参数
SX1223SK915 功能描述:KIT STARTER FOR XE1223 915MHZ RoHS:是 类别:RF/IF 和 RFID >> RF 评估和开发套件，板 系列:- 标准包装:1 系列:- 类型:GPS 接收器 频率:1575MHz 适用于相关产品:- 已供物品:模块 其它名称:SER3796
SX1230 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Integrated Transmitter IC Narrow/wideband 315 MHz, 434 MHz 868 MHz and 915 MHz band Transmitter
SX1230-11SKA433 制造商:Semtech Corporation 功能描述:Evaluation Kit For SX1230-11SKA 433 mHz (SX1230SKA /SX1211SKA board) Transmitter
SX1230-11SKA868 制造商:Semtech Corporation 功能描述:NARROW/WIDEBAND RF TRANSMITTER 868MHZ
SX1230-11SKA915 制造商:Semtech Corporation 功能描述:NARROW/WIDEBAND RF TRANSMITTER 915MHZ 制造商:Semtech Corporation 功能描述:Evaluation Kit For SX1230-11SKA 915 mHz (SX1230SKA /SX1211SKA board)
SX1230-12SKA433 制造商:Semtech Corporation 功能描述:USB KIT - SX1230 433MHZ 制造商:Semtech Corporation 功能描述:Deluxe USB Starter Kit for SX1230, Includes Two USB Interface Boards at 433MHz
SX1230I066TRT 功能描述:IC TX UHF 433/868/916 MHZ 24-QFN RoHS:是 类别:RF/IF 和 RFID >> RF 发射器 系列:- 标准包装:4,000 系列:- 频率:310MHz ~ 440MHz 应用:- 调制或协议:UHF，ASK 数据传输率 - 最大:20 kBaud 功率 - 输出:1dBm ~ 5dBm 电流 - 传输:10mA 数据接口:PCB，表面贴装 天线连接器:PCB，表面贴装 存储容量:- 特点:- 电源电压:2.2 V ~ 4 V 工作温度:-40°C ~ 85°C 封装/外壳:16-LSSOP（0.154"，3.90mm 宽） 包装:带卷 (TR)
SX1230SKA 制造商:Semtech Corporation 功能描述: