TI CC1101近1GHz收发器解决方案

       TI的CC1101是非常低功耗无线应用的低成本接近1GHz收发器,主要用于ISM频段和SRD(短距离设备),频率范围在315 MHz, 433 MHz, 868 MHz和915 MHz,并且很容易编程.

       用在其它的频带如300-348 MHz, 387-464 MHz 和779-928 MHz. CC1101的应用范围主要有工作在315/433/868/915 MHz ISM/SRD频带的超低功耗无线连接,无线告警和安全系统,工业监测和控制,无线传感器网络,自动读表(AMR)以及家庭和建筑物自动化.

       CC1101 Low-Cost Low-Power Sub-1GHz RF Transceiver
The CC1101 is a low-cost sub- 1 GHz transceiver designed for very low-power wireless applications. The circuit is mainly intended for the ISM (Industrial, Scientific and Medical) and SRD (Short Range Device) frequency bands at 315, 433, 868, and 915 MHz, but can easily be programmed for operation at other frequencies in the 300-348 MHz, 387-464 MHz and 779-928 MHz bands.

CC1101 is an improved and code compatible version of the CC1100 RF transceiver. The main improvements on the CC1101 include:

mproved spurious response
Better close-in phase noise improving Adjacent Channel Power (ACP) performance
Higher input saturation level
Improved output power ramping
Extended frequency bands of operation, i.e. CC1100: 400-464 MHz and 800-928MHz

CC1101: 387-464 MHz and 779-928MHz
The RF transceiver is integrated with a highly configurable baseband modem. The modem
supports various modulation formats and has a configurable data rate up to 500 kBaud.
CC1101 provides extensive hardware support for packet handling, data buffering, burst
transmissions, clear channel assessment, link quality indication, and wake-on-radio.
The main operating parameters and the 64- byte transmit/receive FIFOs of CC1101 can be
controlled via an SPI interface. In a typical system, the CC1101 will be used together with a
microcontroller and a few additional passive components.

       应用:

Ultra low-power wireless applications operating in the 315/433/868/915 MHz ISM/SRD bands
Wireless alarm and security systems
Industrial monitoring and control
Wireless sensor networks
AMR – Automatic Meter Reading
Home and building automation
       主要性能:

       RF 性能:
High sensitivity (–111 dBm at 1.2 kBaud, 868 MHz, 1% packet error rate)
Low current consumption (14.7 mA in RX, 1.2 kBaud, 868 MHz)
Programmable output power up to +10 dBm for all supported frequencies
Excellent receiver selectivity and blocking performance
Programmable data rate from 1.2 to 500 kBaud
Frequency bands: 300-348 MHz, 387-464 MHz and 779-928 MHz

       模拟性能:

2-FSK, GFSK, and MSK supported as well as OOK and flexible ASK shaping

Suitable for frequency hopping systems due to a fast settling frequency synthesizer: 90us settling time

Automatic Frequency Compensation (AFC) can be used to align the frequency synthesizer to the received center frequency
Integrated analog temperature sensor

       数字性能:

Flexible support for packet oriented systems: On-chip support for sync word detection, address check, flexible packet length, and automatic CRC handling
Efficient SPI interface: All registers can be programmed with one “burst” transfer
Digital RSSI output
Programmable channel filter bandwidth
Programmable Carrier Sense (CS) indicator
Programmable Preamble Quality Indicator (PQI) for improved protection against false sync word detection in random noise

Support for automatic Clear Channel Assessment (CCA) before transmitting (for listen-before-talk systems)

Support for per-package Link Quality Indication (LQI)

Optional automatic whitening and dewhitening of data

       低功耗特性:

400 nA sleep mode current consumption

Fast startup time: 240us from sleep to RX or TX mode (measured on EM reference design [5] and [6])

Wake-on-radio functionality for automatic low-power RX polling

Separate 64-byte RX and TX data FIFOs (enables burst mode data transmission)

       一般特性:

Few external components: Completely onchip frequency synthesizer, no external filters or RF switch needed

Green package: RoHS compliant and no antimony or bromine

Small size (QLP 4x4 mm package, 20 pins)

Suited for systems targeting compliance with EN 300 220 (Europe) and FCC CFR Part 15 (US).

Support for asynchronous and synchronous serial receive/transmit mode for backwards compatibility with existing radio communication protocols

Fig.1 CC1101 S简化方框图

Fig.2. 典型电路和评估电路 315/433 MHz

Fig.3. 典型应用和评估电路868/915 MHz

                                                           表1.应用电路的材料清单

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