Semtech SX1230 ISM频段发送方案

Semtech 公司的SX1230 是集成的ISM频段(315, 434, 868 和915 MHz)窄带/宽带发送器. SX1230可提供两种模式工作:MCU控制模式和”单独使用”模式.还可以多种调制格式提供窄带和宽带通信.RF输出功率从表面上看17dBm到-18dBm可编程,比特速率高达300kbps. 采用FSK, GFSK, MSK, GMSK 和 OOK调制,工作电压1.8 到 3.7 V,可用在RKE,遥控和安全系统,语音和数据RF通信链接,过程以及建筑物/家庭控制等.本文介绍了SX1230的主要特性,方框图以及在ISM频段的应用电路与多种输出匹配电路.

SX1230 - Integrated Transmitter IC Narrow/wideband 315 MHz, 434 MHz 868 MHz and 915 MHz band Transmitter
The SX1230 is a fully integrated transmitter which can operate in the 315, 434, 868 and 915 MHz licence free ISM bands.
The transmitter has two modes of operation, a conventional MCU controlled mode and a ‘stand-alone’ mode which enables the SX1230 to download configuration and messages from an E2PROM in response to a user input.
Stand-alone mode makes the SX1230 ideal for miniaturized or low cost remote keyless entry (RKE) applications. It also offers the unique advantage of narrow-band and  wide-band communication in a range of modulation formats.
The SX1230 offers high RF output power and channelized operation suited for the European (ETSI EN 300-220-1), North American (FCC part 15.231, 15.247 and 15.249) and Japanese (ARIB T-67) regulatory standards.
主要特性:
dBm to -18 dBm Programmable output power.
Bit rates up to 300 kbits / sec.
FSK, GFSK, MSK, GMSK and OOK modulation.
Stand-alone mode: No need for a host MCU.
Consistent RF performance over a 1.8 to 3.7 V range.
Low phase noise (-95 dBc/Hz at 50 kHz) with automated PLL calibration and fully integrated VCO and loop filter.
On chip RC timer for timer / wake-up applications.
Low battery detection.
应用:
Remote Keyless Entry (RKE)
Remote Control / Security Systems
Voice and Data RF Communication Links
Process and building / home control
Active RFID
AMR / AMI Platforms



图1.SX1230简化方框图



图2.SX1230单独使用的应用电路图



图3.SX1230 MCU模式应用电路



图4.SX1230 RKE演示接收器框图



图5.输出17dBm 902-928 MHz (FCC)和868 MHz (ETSI) 匹配电路


图6.输出17dBm 434MHz频段匹配电路



图7.输出17dBm 315MHz频段匹配电路



图8.输出13dBm 915MHz频段优化匹配电路



图9.输出13dBm 868MHz频段优化匹配电路



图10.输出13dBm 315/434MHz频段优化匹配电路