Scitronics DSP1000OT900 Conveyor Belt Scale User Manual LINX HP Receiver Module Guide

Download:
Mirror Download [FCC.gov]
Document ID	62032
Application ID	Pyjg1pdoapjpewWWoB2XhQ==
Document Description	LINX HP Receiver Module Guide
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	283.52kB (3544009 bits)
Date Submitted	1999-10-05 00:00:00
Date Available	1999-11-03 00:00:00
Creation Date	2001-05-22 14:55:53
Producing Software	Acrobat Distiller 4.0 for Windows
Document Lastmod	2001-05-22 14:55:55
Document Title	LINX HP Receiver Module Guide

HIGH PERFORMANCE
RF MODULE
RXM-900-HP
TEL'HNDLDEIES
' ' ' ' ' WIRELESS Mans SIMPLE
HP SERIES RECEIVER MODULE DESIGN GUIDE
DESCRIPTION:
The HP series receiver module is designed tor the I as in
cust-eflactive, nigh-panormance Wireless tranelcr ol ' '
analog or digital data. in the popular 902-923MH1
hand. The receiver otters eight selectable channels
and. when paired With an HP series transmitter. is
capable oI rucuivlng analog and digital inlormation
lur distances up to 1/4 mile. To assure optimum
performance under all field conditions the receiver
plnlplang'a | n
0.54
‘ 055 ml?
=g
=g
=a
employs an advanced microprooesscr-eantmlted IT -------- r 5
synthesized architecture. Like an Linx modules the gsggggggsgggiggggg
Hl” series requires no tuning and In most cases no 55 555‘ 35
external RF components (except an antenna), 5 £225 5“
making integration straightlorward even ior W"?
engineers lacking previous HF experience
FEATURES:
Figure 1: Physical Far/tag:
I 8 Binary Selectable Reception Frequencies
I Exceptional Sensifivixy (~95dBm @ 10‘5 BER typical)
l ngh Serial Data Rate (SOKbns max.)
I Direct Serial Interface
I Fully Qualified Data Output
I Wide-Range Audie-Capabte Analog Ouqu (50Hz-25KH1)
I Cost-Eilective
I No Extemsl RF Components Required (Exwpt Antenna)
I Manufacturing-Friendly SIP-Style Packaging
I Precision-Synthesized Frequency Relerence
I Vifide Supply Range (2.7-16V DC)
I Receive Signal Strength (RSSI) and Powerdown Pins
I No Production Tuning
APPLICATIONS INCLUDE:
I Continuous Data Transfer
- Home/Industrial Automation / " 8 0& - 7-5-6 , 55 7 7
I Wireless Networking
I Remote Control ORDERING INFORMATION
I Remote Access PART # DESCRIPTION
I Remote Monitoring/Telemetry
Fire/Security Alarms
Long»Range RFID TXM-QOD-HP Transmitter 900 MHz
- HigthuaIity Wireless Audio "XM-BW'HP Receiver 900 MHZ
R-
Analog Signal Transler _
General Wire Elimination p? " X ?7
wind Moms
MDEV-SOO—HP Evaluation Kit 900 MHZ
SPECIFICATIONS
ABOUT THESE MEASUREMENTS
The periormance parameters listed below are based on module operation at
25°C lrom a SVDC supply unless otherwise nnled. it is recommended all ground
plns be connected to the ground-plane. The pin marked N/C has no physical
connection and is designed only to add support
A, .
Input Voltage
Supply Current
Sleep Current
Data output:
Lngic iuw
Logic high
nF input impedanw
Receive ircqucncy
Nelse Bandwmtn
Data Bandwidth
Audio Bandwidth
Sensitivity
DC Modulation Sensitivity
FISSI.
Dynamic Flange
Gain
Voltage/No Carrier
Spurious Emmlsswns
Intertoronoe Rejection:
Hall Fc Spurious
Fczi MHz
Figurz 2: Specificaliun: [able
Notes:
1. 0m lull coupling voltagn
2. Depends 00050 ~ 082 voltage levels
3, For m~5 BER a gem bps
4 Minimum inpul pansy Isl/GI to msum mat data wipul can hold a DC IOVGI
Absolute Maximum Ratings:
Supply voltage V0}: -0.3 (0 I8 VDC
Opetaling temperature i 0°C to +70°C
Snags tsmpcratum 45'c m “we
Soidsring ismpsrlture laws for 15 sec.
RF input, pin I 0 dBm
‘NOTE‘ Ella-ding 0! tin tin-n- of mt. action may me to puma-m
may. to the dwiu urm'mm mm opal-nth" n m munimnm
mummy me- mmmhmlu
Figum 3: Maximum rating: table
Pan! 2
TYPICAL PERFORMANCE GRAPHS
mm ”a. mutt,“ my mum
on
non
4": we on 46 m -sa 40
mums-vii
Figurt 4; Rerzivzr Tum-mi 77m: Figure 5; Receivzr RSSI
Tn}. . im m-ytf-r'nc lwtr nu. 5m
| *
no at M in or as so 47 as w 4111
PleSm)
Figure 6, R551 Ruin-1m? Tim: Figure 7.» BER w. 1an1 Power (typical)
‘CAUTION‘
This product incorporates numerous static-sensitive components,
Always wear an ESD wrist strap and observe proper ESD handling
procedures when working with this device. Failure to observe this
precaution may result in module damage or failure.
PHYSICAL PACKAGING
The receiver is packaged as a hybrid
lhrough-hule SIP-style module with 18
pins spaced at ,1" intervals. Baseband
components occupy the rear of the board ’“ WWW“
while high-frequency components are
grouped on the from. Pin 1 is on the tar Ieh .
oi the board when viewed from the front “W" 3" ”Wm” ”6‘ka
PRODUCTION CONSIDERATIONS
The SIP module may be Installed using hand» or wave-solder techniques. The
module should not be subjected to reIIow. II the module is subject to production
wash cycles. adequate drying time should be allowed prior to power-up. II the
wash cycle introduces contaminants. the module‘s portormance may be
adversely affected,
THEORY OF OPERATION
The HP-RXM is a high-periormance, eight-channel. dual-conversron superhet
FM receiver capable of receiving analog or digital data.
fi> ®
1/3 ,
in nim- 1;
bh-nun-w
>r
b \
L—i .> fl—I >——~ m-
n m mmm
mn. ." meet
u: __> um
Figure m: HP Series Rmrm rum-k Diagram
Digital information is modulated at the transmitter using FSK (irequency shift
keying), the binary term of frequency modulation, FSK otters significant
advantages over AM-busod modulation methods, i.e., increased noise immunity
and the ability oi the receiver to "capture“ in the presence oi multiple signals.
These advantages Will be particularly appreciated in crowded bands like those m
which the HP operates.While FSK modulation is not the most bandwidth-efficient
manner oi modulating digital data, it is an excellent choice ior reliable. low-cost,
low-power HF products such as the HP series.
To transmit analog iniormatlon the module employs FM modulation In this mode,
simple to pomplex waveforms can be introduced at the transmitters data out and
recovered W|th minimal distortion at the receiver analog output pin.
The user-supplied antenna is connected at pin 1 (see Figure no The HP-RXM RF
port is matched to 50 ohms to support interlace to commonly available antennas
such as those manufactured by Linx.
The RF signal coming in from the antenna is filtered by a SAW (surface acoustic
wave) filter. The purpose oi the SAW BPF is to attenuate unwanted FtF energy
(i.e.. not In the 902-928 MHz band) that is present atthe antenna. A SAW device
provides significantly sleeper rol|~ofl and higher out-obtzand attenuation than
other illter types such as an LG bandpass.
Once littered by the SAW. the signal is then amplified by a Low-Noise Amplifier
(LNA) to increase the receiver sensitivity and lower the overall noise figure of the
receiver, After the LNA. the signal is mixed with a synthesized local oscillator to
perform the first lrequency conversion,
The first IF frequency is 14.7 MHz. This frequency Is achieved by setting the
synthesizer frequency to a value thal is 147 MH1 higher than the incoming FIF
energy from the antenna. The 147 MHz IF frequency works out nicely as it
inherently eliminates the low image for the second conversion to 10.7 MHz, thus
eliminating the possibility of an in-band image from an unwanted source.
A high—performance lF receiver strip is used to perform the second conversion
and the FM demodulation. The IF strip takes the 14.7 MHz frequency trom the
first conversion. mixes it with a high-precision 4.0 MHz crystal oscillatorA
generated frequency to produce the second IF of 10.7 MHz, and amplifies it in
preparation for PM demodulation.
FM demodulation is achieved with an outward gilbert multiplier. The output of
the IF strip is a demodulated wavoform that. after filtering. very closely resembles
the original waveform used to modulate the transmitter.
A high-penormance, active low-pass filter cleans up the audio signal. removing
all of the unwanted nolse lrom the FM demodulation process. The output of this
filter is provided to the audio output pin and to the BitPERFECT bit slicer. which
uses proprietary methods to support a wide dynamic range of modulation rates
(300 bps to SOKbps) wilh no prerequisites for waveform duty cycle.
An on-board micro-controller is used to manage receiver functions and to provide
a simple interface to external circuitry The micro-controller performs the following
functions:
- FREQUENCY SYNTHESIZEFI PROGRAMMING: The micro—controller reads
the threechannel select input lines and programs the frequency synthesizer
registers to the proper values tor a given channel. This frees the user from
complex programming requirements and allows for manual channel selection via
switches in product designs where a microprocessor is not used.
- BASEBAND DATA QUALIFICATION: The micro-controller monitors the signal
quality and squelches the data output when the signal is not strong enough for
accurate data detection. This prevents noise on the data output pin during
low-signal or no-slgnai conditions.
BOARD LAYOUT CONSIDERATIONS
GK
ll you are at all familiar with HF devices you may be concerned about
specialized layout requirements. Fortunately. because of the care taken by
Linx in the layout of the module's PCB, integrating an HP series receiver into
your design is very straightforward. By adhering carefully to a few basic
design and layout rules. you can enjoy a trouble-free path to RF success.
Figure it shows the
suggested PCB footprint for
r?” “18“ the HP series receiver.
.mԤwulmnmmnnmmmnmmnnm Aground~plane(aslargeas
J possible) should be placed
330“ Die. Flnllhod directly under the HP
receiver. This groundplane
can also be critical to the
performance of your
antenna.
Figure l I: Suggexlerl PCB Fnorprirrl
NOTE: READ THIS IFYOU ARE scrum-o PERIODICALLY
POWER-DOWN RECEIVER"
A common method ol reducing receiver power consumption is to turn the receiver all
via the PDN pin lor some time interval and wake the receiver periodically to cheek tor
the presence oi e transmitted signal. In order to Implement this method with an HP
receiver succesalully. there are some timing requirements the user must observe
when powering up this receiver to check tor channel ecuvlry
At power up tho receivers oft-board microprocessor will begin its start-up routine as
detaile previously A 95 mSec time period mutt be Ellollfld to xIIOw this routine to be
completed Altar 55 isc, the date and RSSI circuits are fully ouaiii’ied and reliable
The oripenod ls determined by the discharge rate ol the internal bypass capacitors.
The capacitors must iuiiy discharge to ensure that strhsaquanl power-ups will reliably
restart the microprocessor, This minimum time should be no less than 300 mSec. It
the user is finding that the transmitter rs not reliable stamng up alter power~up, this
time should be increased
CHANNEL SELECTION
The HP receiver module leatures eight user-selectable channels. The channel of
on the pins' states The on»
board microprocessor parlor-ms
all PLL iuading functioni This
trees the user irom complex
programming requirements and
allows ier manual channel
selection via switches in product
designs where a micmprooessor
is not used. Figurr If: (“hunan-Spirrrirm Tabla
ANALOG OUTPUT
The analog output is dartved alter amplification in the BitPERFECT on shear. The
analog output Is valid trom 50 Hz to 25 KHz. providing an AC signal of about lV
paak-td-peak. This output should not be used to drive a low-impedance load such
as a speaker. in applications requiring direct drive into a speaker, such as the
transmission of audio, a simple op-amp circuit like the one shown in Figure 16
can be used. In this circuit, the op-amp Is used to act as an Impedance converter.
IuF
NPArulog out o ii—L
473
Q_
WK <
Figure 16. ArrdioAmylifizr
Pagn to
LEGAL CONSIDERATIONS
NOTE: HP Series Module: we designed a: component device: which requin
txtenml components tafuncta‘an. Th: module: are intended to allow for full Hart
ls compliance; however, they m not approved by the FCC army all)" agency
worldwide, Th: punhua Malawi: that approval! may be required pier to
rm sale or apmn'an afthe device, andagrux to may the can-paw in keeping
with all laws governing in opauflon in the dummy ofapemn‘an.
When working with RF. a clear distinction must be made between what is technically
possible and what is legally acceptable in the country where operation is intended.
Many manulacturers have avoided incorporating RF into their products as a result at
uncertainty and even leaf ol the approval and certification process. Here at Linx our
desire is not only to expedite the design process, but also to assist you in achieving
a clear idea at what is involved in obtaining the necessary approvals to legally market
your completed product.
In the United States the approval process is acwally quite stratghttorward. The
regulations governing RF devices and the enloroement of them are the responsrbllity
ol the Federal Communications Commission. The regulations are contained in the
Code of Federal Regulations (CFR), Title 47. Title 47 Is made up ol numerous
volumes, however. all regulations applicable to this module are contained in volume
0719. It is strongly recommended that a copy be obtained trom the Government
Printing Ottlce In Washington, or from your local government book store. Excerpts ol
applicable sections are included with Linx evaluation kite or may be obtained from the
Lrnx Technologies web site (www.linxteehnologles.com). In brtsl, those mles require
that any device which Intentionally radiates HF energy be approved, that is. tested,
lor compliance and issued a unique identification number. This is a relatively painless
process. Llnx otters lull EMC pro—compliance testing in our HF/Emco-equipped test
center. Final compliance testing is than pertormed by one at the many independent
testing laboratories across the country. Many labs can also provide other
certmcatlons the product may require at the same time. such as UL, CLASS NB, etc,
Once your completed product has passed, you will be issued an ID number which is
then clearly placed on ouch product manutactured.
Questions regarding interpretations oi the Part 2 and Part 15 rules or measurement
procedures used to test Intentional radiators, such as the HP modules. lor
compliance with the Part 15 technical standards, should be addressed to:
Federal Germanium Commlssron
Equipment Authorlzatlon Melon
Claim-Ital Servkx Elam)", MS 130on
7435 Wild Mill! Road
Gambia. MD 21046
Tm: (301) 725-1585 1 For (am) manor) EvMaII' raunruorac gov
Intematjonal approvals are slightly more complex, although many modules are
designed to allow all international standards to be met. It you are considering the
export oi your product abroad, you should contact Unx Technologies to determine
the specific suitability ol the module to your applicaflon.
All Linx modules are designed with the approval process In mind and thus much at
the trustration that is typically experienced with a discrete design Is eliminated.
Approval ls still dependent on many lemurs such as the choice at antennas, correct
use ol the lrequency selected, and physical packaging. While some extra cost and
design often are required to address these issues, the additional usefulness and
profitability added to a product by RF makes the ellort more than worthwhile.
SURVIVING AN RF IMPLEMENTATION
Adding an RF stage brings an exciting new dimension to
any product. It also means that additional often and
"summoning-mum
commitment will be needed to bring the product mmgm’
successfully to market By utilizing premade FtF cabana-MAM mist
modules, such as the HP Series, the design and V
approval process will be greatty simplified. It is still “my“
important. however. to have an obiedve view of the “Wynn”
steps necessary to insure a suwesstul RF integration. 7
Since the capabilities of each customer vary wtdoty it is WW
diffiailt to recommend one particular design path, but
most projects Ibllow steps Similar to those shown at the WWn—‘f‘réfl'hflfin
right uvnvrloun
In reviewmg this sample design path you may notice I“, m!“
that Linx otters a variety oi services. such as Jmfl‘rfih
antenna design. and FCC prequalitlcation. that are
unusual for a high-volume component manufacturer.
These services, along with an exceptional level of
technical support, are uttered because we recognize
that RF is a complex science requiring the highest
cancer at products and support, "ereless Made
Simple“ is more than Just a motto. it's our
commitment. By choosing Linx as your RF partner “we“ STEPS FOR
and taking advantage of the resources we otter. you |MFLEMENT|NG as
will not only survive implementing RF. but you may
even find the process enjoyable.
c-toct-o-oboe-IllUI...acolllclllino-lablation-OOQ-o-noooo
HELPFUL APPLICATION NOTES FROM LINX
It is not the intention at this manual to address in depth many at the issues that
should be considered to ensure that the modules lunctiun correctly and deliver
the maximum possible performance. As you proceed with your design you may
wish to obtain one or more at the following application notes, which address in
depth key areas at RF design and application at Linx products.
NOTE it LINX APPLICATION NOTE TITLE
oosoo Ant-nun: mug... Applknlon, mimic.
Modfllfien todmlqnu fur Inn-cm IF den IInIu
Could-rations hr operation in His 902 MIiz to 92! Mhz band
Could-rations for mitt-diurnal RF omrlronmcms
00100 RF101zlnformnlon ford“ RF challenged
00140 The FCC Ito-d: Part 15 from com-pt to approval
Use and design of T-Alhmmion Pods
Underatandlng the ptrfnrmance xpxtfiuflons of rec-Ivan
Page 71
I'll,—
U.S. CORPORATE HEADQUARTERS:
LlNX TECHNOLOGIES. INC.
575 5.5. ASHLEY PLACE
GRANTS PASS, OR 97526
Phone: (541) 471-6256
FAX: (541) 471-6251
http://www.Iinxtechnologles.com
Disclaimer
Linx Technologies is continually striving to improve the quality and lunction at its products: ler
this reason. we reserve the right to make changes without notice. The tnlomtallcn oontainod in
this Data Sheet is believed to be acwrate as at the time 0! publication. Specifications are based
on representative lot samples, Values may vary lrom lot in lot and are not guaranteed Linx
Technologies makes no guarantee. warranty. or representation regarding the suitability at any
product tor use in a specific application, None at mesa devices is intended lor use in
applications at a critical nature where the salary of tile or property is at risk. The user assumes
lull liability lor the use at product In sum applimtinns. Under no conditions will Unx Technologies
be responsible tor losses arising from the use or tailors oi the device In any application. other
than the repair, replacement. or relund limited to the original product purchase price. Some
devices described In this publication are patented. Under no clrwmslanoos shall any user be
conveyed any license or right to the use or ownership at these patents,
a 10m hy rm Technologicr, tnc, I'hr “yum
Unx logo. Linx. Ind "Mmkss mad: Simple"
in: tit: unhntmlu of Linux 1hdttmiulici, lnr
Printm in U SA

---

Source Exif Data:

File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.2
Linearized                      : Yes
Create Date                     : 2001:05:22 14:55:53
Producer                        : Acrobat Distiller 4.0 for Windows
Modify Date                     : 2001:05:22 14:55:55-04:00
Page Count                      : 9

EXIF Metadata provided by EXIF.tools