參數(shù)資料
型號(hào)： RF2516
廠商： RF MICRO DEVICES INC
元件分類： 通信及網(wǎng)絡(luò)
英文描述： VHF/UHF TRANSMITTER
中文描述： SPECIALTY TELECOM CIRCUIT, PDSO16
封裝： ROHS COMPLIANT, PLASTIC, SSOP-16
文件頁(yè)數(shù)： 9/20頁(yè)
文件大小： 295K
代理商： RF2516
Preliminary
11-43
RF2516
Rev A10 010613
11
T
The control lines provide an
interface
for connecting
the device to a microcontroller or other signal generat-
ing mechanism. The designer can treat pin 8 (MOD
IN), pin 16 (DIV CTRL), and pin 3 (PD) as control pins
whose voltage level can be set. The lock-detect voltage
at pin 15 (LD FLT) is an output that can be monitored
by the microcontroller.
Pin 15 (LD FLT) is used to set the threshold of the
lock-detect circuit
. A shunt capacitor is used to set an
RC time constant with an on-chip series 1k
resistor.
The time constant should be approximately 10 times
the reference period.
General
RF bypassing
techniques must be observed
to get the best performance. Choose capacitors such
that they are series resonant near the frequency of
operation.
Board layout
is always an area in which great care
must be taken. The board material and thickness are
used in calculating the RF line widths. The use of vias
for connection to the ground plane allows one to con-
nect to ground as close as possible to ground pins.
When laying out the traces around the VCO, it is desir-
able to keep the parasitics equal between the two legs.
This will allow equal valued inductors to be used.
Pre-compliance testing
should be performed during
the design process. This can be done with a GTEM cell
or at a compliance testing laboratory. It is recom-
mended that pre-compliance testing be performed so
that there are no surprises during final compliance
testing. This will help keep the product development
and release on schedule.
Working with a laboratory offers the benefit of years of
compliance testing experience and familiarity with the
regulatory issues. Also, the laboratory can often pro-
vide feedback that will help the designer make the
product compliant.
On the other hand, having a GTEM cell or an open air
test site locally offers the designer the ability to rapidly
determine whether or not design changes impact the
product's compliance. Set-up of an open air test site
and the associated calibration is not trivial. An alterna-
tive is to use a GTEM test cell.
After the design has been completed and passes com-
pliance testing, application will need to be made with
the respective regulatory bodies for the geographic
region in which the product will be operated to obtain
final certifications.
RF2516 Typical Applications
FCC Part 15.231 Periodic Transmitter - 315MHz Auto-
motive Keyless Entry Transmitter
The following information is taken or paraphrased from
the Code of Federal Regulations Title 47, Part 15, Sec-
tion 231 (47 CFR 15.231). Part 15 discusses radio fre-
quency devices and section 231 discusses periodic
transmissions. Please refer to the regulation itself as
the final authority. Additional information may be found
on the Internet at www.fcc.gov.
To highlight the main guidelines outlined by this sec-
tion, there are five main limitations: operating fre-
quency, transmission content, transmission duration,
emission bandwidth, and spurious emissions.
Part 15.231 allows operation in two bands: 40.66MHz
to 40.70MHz and above 70MHz. Transmission is lim-
ited to control signals such as alarm systems, door
openers, remote switches, etc. Radio control of toys is
not permitted, nor is continuous transmission such as
voice or video. Data transmission other than a recogni-
tion code is not permitted. Transmission time is limited
to 5 seconds (paragraph a) or for 1 second with greater
than ten seconds off (paragraph e).
Emission bandwidth between 70MHz and 900MHz
can not be more than 0.25% of the center frequency.
Above 900MHz, the emission bandwidth cannot be
greater than 0.50% of the center frequency. The emis-
sion bandwidth is determined from the points that are
20dB down from the modulated carrier. This corre-
sponds to an occupied bandwidth of 4.5MHz at a cen-
ter frequency of 902MHz, 1.1MHz at 433MHz, and
788kHz at 315MHz.
Spurious emissions limits are listed in tabular form for
various frequency ranges in the Section 231. Above
470MHz with a manually activated transmitter, the fun-
damental field strength at a distance of 3 meters shall
not exceed 12,500microvolts/meter. The spurious
emissions shall not exceed 1,250microvolt/meter at a
distance of 3meters above 470MHz. Refer to Appen-
dix A for a method of converting field strength to power.
In the frequency range of 260MHz to 470MHz, one
needs to linearly interpolate the maximum emissions
level for both the fundamental and spurious emissions.
The equation for this line is given by:
E
V
------
m
412
3
--
Freq
MHz
70831
3
--
–
=
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