参数资料
型号: TXM-315-LC_
厂商: Linx Technologies Inc
文件页数: 13/40页
文件大小: 0K
描述: TRANSMITTER RF 315MHZ SMT
产品变化通告: Internal Componet Change 19/Jul/2010
标准包装: 50
系列: LC
频率: 315MHz
应用: ISM,RKE,安全警报与火警
调制或协议: ASK,FSK
数据传输率 - 最大: 5 kbps
功率 - 输出: -4dBm ~ 4dBm
电流 - 传输: 3mA
数据接口: PCB,表面贴装
天线连接器: PCB,表面贴装
电源电压: 2.7 V ~ 5.2 V
工作温度: -30°C ~ 70°C
封装/外壳: 表面安装
包装: 管件
Theory of Operation
The LC Series transmitter transmits data using Carrier-Present Carrier-
Absent (CPCA) modulation. This type of AM modulation is often referred
to by other designations, including Continuous Wave (CW) and On-Off Key
(OOK). This type of modulation represents a logic low ‘0’ by the absence
of a carrier and a logic high ‘1’ by the presence of a carrier. This method
affords numerous benefits. Three of the most important are:
1) Cost-effectiveness due to design simplicity.
2) No minimum data rate or mark / space ratio requirement.
3) Higher output power and thus greater range in countries (such as the
U.S.) where output power measurements are averaged over time. (Please
refer to Linx Application Note AN-00130).
The LC Series transmitter is based on a simple but highly optimized
architecture that achieves a high fundamental output power with low
harmonic content. This ensures that approval requirements can be
met without external filter components. The LC Series transmitter is
exceptionally stable over time, temperature, and physical shock as a result
of the precision Surface Acoustic Wave (SAW) frequency reference. Due to
the accuracy of the SAW device, most of the output power is concentrated
in a narrow bandwidth. This allows the receiver’s bandwidth to be quite
narrow, thus increasing sensitivity and reducing susceptibility to near-band
interference. The quality of components and overall architecture utilized in
the LC Series is extraordinary in a low-cost RF device and is one reason
the LC transmitter is able to outperform more expensive products.
The Data Input
A CMOS / TTL level data input is provided on Pin 2. This line is normally
supplied with a serial bitstream input directly from a microprocessor,
encoder or UART. During standby, or the input of a logic low, the carrier is
fully suppressed and the transmitter consumes less than 2μA of current.
During a logic high, the transmitter generates a carrier to indicate to the
receiver the presence of a logic ‘1’. The applied data should not exceed a
rate of 5,000bps. The data input line should always be driven with a voltage
common to the supply voltage present on Pin 7 (V CC ) and should never be
allowed to exceed the supply voltage.
– 9 –
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