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HP SERIES-3 RECEIVER MODULE DESIGN GUIDE
DE S C R IP T ION:
T he HP -3 R F receiver module is the third generation of the popular HP S eries and offers
complete compatibility and numerous enhancements over previous generations. Like its
predecessors, the HP -3 is designed for the cost-effective, high-performance wireless transfer
of analog or digital information in the popular 902-928MHz band. All HP -3 series modules
continue to feature eight parallel selectable channels but versions are also available which
add serial selection of 100 channels . To ens ure reliable performance, the receiver employs
F M/F S K demodulation and an advanced dual-convers ion microproces s or-controlled
synthesized architecture. T he receiver is pin- and footprint-compatible with all previous
generations but its overall physical size has been reduced. B oth S MD and pinned packages
are now available. When paired with an HP -3 trans mitter, a reliable link is created for
trans ferring analog and digital information up to 1000 ft. (under optimal conditions ). Like all
Linx modules, the HP -3 requires no tuning or additional R F components (except an antenna),
making integration straightforward even for engineers without prior R F experience.
FEATURES:
€ 8 P arallel/100 S erial (P S Versions)
User-S electable C hannels
€ P recision F requency S ynthesized
Architecture
€ S AW F ilter F or S uperior Out-of-B and
R ejection
€ F M/F S K Demodulation F or Outstanding
P erformance and Noise Immunity
€ E xceptional S ensitivity (-100 dB m typical)
€ Wide-R ange Analog C apability Including
Audio (50Hz-28kHz)
€ Transparent S erial Data Output
(56K bps max.)
€ Direct S erial Interface
€ R eceive S ignal S trength (R S S I) and
P owerdown Lines
€ C ost-E ffective
€ P inned or S MD P ackaging
€ Wide S upply R ange (2.8-13V DC )
€ E xtended Temperature R ange
(-30°C to +85°C )
€ No P roduction Tuning or E xternal R F
C omponents R equired (E xcept Antenna)
€ C ompatible With P revious HP S eries
Modules
R evis ed 6/10/03
H
-P
IGH
ERFORMANCE
RF MODULE
RXM-900-HP3
APPLICATIONS INCLUDE:
€ G eneral Wire E limination
€ Wireles s Data Trans fer
€ Wireles s Analog / Audio
€ Home / Indus trial Automation
€ Wireles s Networks
€ R emote C ontrol
€ R emote Acces s
€ R emote Monitoring / Telemetry
€ Alarm / S ecurity S ys tems
€ Long-R ange R F ID
€ MIDI Links
€ Voice/Mus ic / Intercom Links
ORDERING INFORMATION
PAR T #
R XM-900-HP3-PPO
R XM-900-HP3-PPS
R XM-900-HP3-S PO
R XM-900-HP3-S PS
MDE V-900-HP3-PPS
MDE V-900-HP3-S PS
DE S C R IP T ION
HP-3 R eceiver (PINNE D 8 C H only)
HP-3 R eceiver (PINNE D 8p /100s C H)
HP-3 R eceiver (S MD 8 C H only)
HP-3 R eceiver (S MD 8p /100s C H)
Development Kit 900MHz (Pinned Pkg.)
Development Kit 900MHz (S MD Pkg.)
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Table of Contents
Related Manuals for Linx Technologies RXM-900-HP3
Summary of Contents for Linx Technologies RXM-900-HP3
- Page 1 ERFORMANCE RF MODULE RXM-900-HP3 HP SERIES-3 RECEIVER MODULE DESIGN GUIDE DE S C R IP T ION: T he HP -3 R F receiver module is the third generation of the popular HP S eries and offers complete compatibility and numerous enhancements over previous generations. Like its predecessors, the HP -3 is designed for the cost-effective, high-performance wireless transfer of analog or digital information in the popular 902-928MHz band.
-
Page 2: Specifications
SPECIFICATIONS ABOUT THESE MEASUREMENTS The performance parameters listed below are based on module operation at 25°C from a 5V DC supply unless otherwise noted. Parameter Designation Min. Typical Max. Units Notes POWER SUPPLY Input Voltage – 13.0 – Supply Current Power-Down Current –... -
Page 3: Typical Performance Graphs
*NOTE* Exceeding any of the limits of this section may lead to permanent damage to the device. Furthermore, extended operation at these maximum ratings may reduce the life of this device. Absolute Maximum Ratings: Supply voltage Vcc -0.3 13 VDC Voltage on any digital input pin (regardless of supply) -0.3... -
Page 4: Pin Descriptions
PIN DESCRIPTIONS It is recommended all ground pins be connected to the groundplane. Pins marked N/C have no physical connection, and are designed only to add support. PIN# Name Equivalent CTK Description RF In RF Input/ 50-ohm RF Input 50Ω Antenna Input Analog Ground No Connection... - Page 5 1.95" 1.94" HP SERIES RF RECEIVER HP SERIES RF RECEIVER 0.78" 0.69" 0.75" RXM-900-HP3-PP* RXM-900-HP3-SP* LOT 10000 LOT 10000 0.190" 0.236" Figure 8: Receiver Physical Package The receiver is available in two package styles. The pinned SIP style is designed for through-hole application and has 18 pins spaced at 0.1"...
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Page 6: Production Considerations
PRODUCTION CONSIDERATIONS Pinned Receiver Hand Assembly The SIP module pins may be hand or wave-soldered. The module should not be subjected to reflow. Linx recommends wash-free manufacturing techniques. The modules are wash-resistant, but are not hermetically sealed. If a wash is used, a drying time, sufficient to allow the evaporation of any moisture which may have migrated into the module, must be allowed prior to applying electrical power. - Page 7 SMD RECEIVER AUTOMATED ASSEMBLY GUIDELINES For high-volume assembly, most users will want to auto-place the modules. The modules have been designed to maintain compatibility with most pick-and-place equipment, however, due to the module's hybrid nature certain aspects of the automated assembly process are far more critical than for other component types.
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Page 8: Theory Of Operation
THEORY OF OPERATION MODE 24MHz Channel 4MHz Crystal RSSI Select Int. Osc. 10.7MHz Digital Data Quad Analog Data 34.7M SAW BPF 10.7M 10.7M Limiter Discriminator Figure 12: HP Series-3 Receiver Block Diagram The HP-3 is a high-performance multi-channel, dual-conversion superhet receiver capable of recovering both analog (FM) and digital (FSK) information from a matching HP transmitter. -
Page 9: Board Layout Considerations
BOARD LAYOUT CONSIDERATIONS If you are familiar with RF you may be concerned about specialized layout requirements. Fortunately, by adhering carefully to a few basic design and layout rules, receiver integration is generally very straightforward. Page 5 shows the suggested PCB footprint Series-3 receiver. -
Page 10: Power Supply
POWER SUPPLY The user must provide a clean source of power module to the receiver to ensure proper operation. Supply noise will reduce receiver sensitivity. The HP-3 incorporates a precision low-dropout regulator on-board which allows operation over >22µF .1µF an input voltage range of 2.8 to 13 volts DC. Figure 15, shows a typical supply filter. -
Page 11: Channel Selection
CHANNEL SELECTION Parallel Selection Channel Frequency 903.37 All HP-3 receiver models feature eight 906.37 parallel selectable channels. Parallel 907.87 909.37 mode is selected by grounding the 912.37 mode pin. In this mode, channel 915.37 selection is determined by the logic 919.87 921.37 states of pins CS0-CS2 as shown in... -
Page 12: Analog Output
ANALOG OUTPUT The HP-3 series is optimized for the transmission of serial data, however, it can also be used very effectively to send a variety of analog signals including audio. The ability of the HP-3 to send combinations of audio and data opens new areas of opportunity for creative design. - Page 13 DATA CONSIDERATIONS Once an RF link has been established, the challenge becomes how to effectively transfer information across it. For simple control or status signals such as button presses or switch closures, consider using an encoder and decoder IC set. These chips are available from several manufacturers including Linx, Microchip, Holtek, and Motorola.
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Page 14: Timing Considerations
TIMING CONSIDERATIONS There are four major timing considerations the engineer must be aware of when designing with the HP-3 Series receiver. These are shown in the table below. Parameter Description Max. Max time between 20mSec data output transitions Max Channel-Change Time 1.5mSec (Time to Valid Data) Receiver Turn-on Time (Via PDN) -
Page 15: Interference Considerations
PROTOCOL CONSIDERATIONS (CONT.) The procedure here is protocol-dependent, but to illustrate let's consider the packet format outlined above being sent to a UART. A UART interprets the start-bit of a byte as a 1-0 transition. When the incoming data is 101010, or hash, it is hard to actually find the start bit. -
Page 16: Rssi Output
RSSI OUTPUT HP-3 Series receivers are equipped with Received-Signal-Strength-Indication (RSSI). The RSSI output is a DC voltage proportional to the incoming signal strength. The output has many valuable uses including interference assessment, signal strength indication, external squelching, and transmitter presence indication.The RSSI circuit has a voltage range of about 800mV to 2.5V and a dynamic signal range of greater than 60dB. -
Page 17: General Antenna Rules
GENERAL ANTENNA RULES The following general rules should help in maximizing antenna performance: Proximity to objects such as a user's hand or body, or metal objects will cause an antenna to detune. For this reason the antenna shaft and tip should be positioned as far away from such objects as possible. -
Page 18: Antenna Considerations
ANTENNA CONSIDERATIONS The choice of antennas is one of the most critical and often overlooked design considerations. The range, performance, and legality of the receiver is critically dependent on the antenna utilized. While adequate antenna performance can often be obtained by trial and error methods, professionally designed antennas, such as those offered by Linx, can provide... -
Page 19: Common Antenna Styles
COMMON ANTENNA STYLES The antenna is a critical and often overlooked component which has a significant effect on the overall range, performance and legality of an RF link. There are hundreds of antenna styles that can be successfully employed with the HP-3 Series. -
Page 20: Legal Considerations
International approvals are slightly more complex, although many modules are designed to allow all international standards to be met. If you are considering the export of your product abroad, you should contact Linx Technologies to determine the specific suitability of the module to your application. -
Page 21: Helpful Application Notes From Linx
SURVIVING AN RF IMPLEMENTATION The addition of wireless capabilities brings an exciting DECISION TO UTILIZE RF IS MADE new dimension to any product. It also means that additional effort and commitment will be needed to bring RESEARCH RF OPTIONS the product successfully to market. By utilizing an RF ORDER EVALUATION KIT(S) module, such as the HP-3, the design and approval TEST MODULE(S) WITH... - Page 22 SERIAL CHANNEL SELECTION TABLE CHANNEL TX FREQUENCY RX LO CHANNEL TX FREQUENCY RX LO 902.62 867.92 915.37 880.67 902.87 868.17 915.62 880.92 903.12 868.42 915.87 881.17 903.37 868.67 916.12 881.42 903.62 868.92 916.37 881.67 903.87 869.17 916.62 881.92 904.12 869.42 916.87 882.17 904.37...
- Page 23 MISMATCH CONVERSION TABLE VSWR Insertion Power Power Loss Transmitted Reflected (dB) 17.391 -6.87 20.57% 79.43% 11.610 -5.35 29.21% 70.79% 8.724 -4.33 36.90% 63.10% 6.997 -3.59 43.77% 56.23% 5.848 -3.02 49.88% 50.12% 5.030 -2.57 55.33% 44.67% 4.419 -2.20 60.19% 39.81% 3.946 -1.90 64.52% 35.48%...
- Page 24 Disclaimer Linx Technologies is continually striving to improve the quality and function of its products; for this reason, we reserve the right to make changes without notice. The information contained in this Data Sheet is believed to be accurate as of the time of publication. Specifications are based on representative lot samples.
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