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参数资料
| 型号： | EVAL-869-ES |
| 厂商： | Linx Technologies Inc |
| 文件页数： | 5/11页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL BASIC 869MHZ ES SERIES |
| 标准包装： | 1 |
| 系列： | ES |
| 类型： | 发射器，接收器 |
| 频率： | 869MHz |
| 适用于相关产品： | Linx OEM 模块 |
| 已供物品： | 2 个板，2 个发射器，2 个接收器，2 个连接器，2 根天线，电池，文档 |
PROTOCOL GUIDELINES
While many RF solutions impose data formatting and balancing requirements,
Linx RF modules do not encode or packetize the signal content in any manner.
The received signal will be affected by such factors as noise, edge jitter, and
interference, but it is not purposefully manipulated or altered by the modules.
This gives the designer tremendous flexibility for protocol design and interface.
Despite this transparency and ease of use, it must be recognized that there are
distinct differences between a wired and a wireless environment. Issues such as
interference and contention must be understood and allowed for in the design
process. To learn more about protocol considerations, we suggest you read Linx
Application Note AN-00160.
Errors from interference or changing signal conditions can cause corruption of
the data packet, so it is generally wise to structure the data being sent into small
packets. This allows errors to be managed without affecting large amounts of
data. A simple checksum or CRC could be used for basic error detection. Once
an error is detected, the protocol designer may wish to simply discard the corrupt
data or implement a more sophisticated scheme to correct it.
INTERFERENCE CONSIDERATIONS
TYPICAL APPLICATIONS
USING THE ES SERIES TRANSMITTER FOR ANALOG APPLICATIONS
The ES Series is an excellent choice for sending analog information, including
audio. The ability of the ES to transmit combinations of analog and digital content
opens many new opportunities for design creativity.
Simple or complex analog signals within the specified audio bandwidth and input
levels may be connected directly to the transmitter’s DATA line. The transmitter
input is high impedance (500k Ω ) and can be directly driven by a wide variety of
sources, ranging from a single frequency to complex content, such as audio.
Analog sources should provide 0V to no more than 5V P-P maximum waveform
and should be AC-coupled into the DATA line. The size of the coupling capacitor
should be large enough to ensure the passage of all desired frequencies. Since
the modulation voltage applied to the DATA line determines the carrier deviation,
distortion can occur if the DATA line is over-driven. The actual level of the input
waveform should be adjusted to achieve optimum in-circuit results.
The RF spectrum is crowded and the potential for conflict with other unwanted
sources of RF is very real. While all RF products are at risk from interference, its
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PDN
LADJ
ANT
GND
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effects can be minimized by better understanding its characteristics.
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VCC LO_V_D
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Interference may come from internal or external sources. The first step is to
eliminate interference from noise sources on the board. This means paying
careful attention to layout, grounding, filtering, and bypassing in order to
0-Vcc Audio Source
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5
GND
DATA
/CLK SE
/CLK
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eliminate all radiated and conducted interference paths. For many products, this
is straightforward; however, products containing components such as switching
power supplies, motors, crystals, and other potential sources of noise must be
approached with care. Comparing your own design with a Linx evaluation board
can help to determine if and at what level design-specific interference is present.
External interference can manifest itself in a variety of ways. Low-level
interference will produce noise and hashing on the output and reduce the link’s
overall range.
High-level interference is caused by nearby products sharing the same
frequency or from near-band high-power devices. It can even come from your
own products if more than one transmitter is active in the same area. It is
important to remember that only one transmitter at a time can occupy a
frequency, regardless of the coding of the transmitted signal. This type of
interference is less common than those mentioned previously, but in severe
cases it can prevent all useful function of the affected device.
Although technically it is not interference, multipath is also a factor to be
understood. Multipath is a term used to refer to the signal cancellation effects
that occur when RF waves arrive at the receiver in different phase relationships.
This effect is a particularly significant factor in interior environments where
objects provide many different signal reflection paths. Multipath cancellation
results in lowered signal levels at the receiver and, thus, shorter useful distances
for the link.
Page 8
0.1μF
Figure 10: AC Coupling An Audio Source
USING THE ES SERIES TRANSMITTER FOR DIGITAL APPLICATIONS
The ES Series transmitter is equally capable at accommodating digital data. The
transmitter input is high impedance (500k) and can be directly driven by a wide
variety of sources including microprocessors and encoder ICs.
When the transmitter will be used to transmit digital data, the DATA line is best
driven from a 3 to 5V source. The transmitter is designed to give an average
deviation of 115kHz with a 5V square wave input, and 75kHz with 3V square
wave input. Either choice will achieve maximum performance.
Data adhering to different electrical level standards, such as RS-232, will require
buffering or conversion to logic level voltages. In the case of RS-232, such
buffering is easily handled with widely available ICs, such as the MAX232, which
is used on the ES Series Master Development System. The Linx SDM-USB-QS
can be used to convert between USB compliant signals and logic level voltages.
Page 9
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