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HP SERIES-3 TRANSMITTER DESIGN GUIDE
DE S C R IP T ION:
T he HP -3 R F transmitter module is the third generation of the popular HP series 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 parts continue to feature eight parallel selectable
channels, but versions are also available which add serial selection of 100 channels.
To ensure reliable performance, the transmitter employs F M/F S K modulation and a
microprocessor-controlled synthesized architecture. T he transmitter 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 receiver, a reliable link is created for transferring 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 parallel, 100 serial (P S Versions)
User-S electable C hannels
€ P recision F requency S ynthesized
Architecture
€ F M/F S K Modulation F or Outstanding
P erformance and Noise Immunity
€ Transparent Analog/Digital Interface
€ High Data R ate (up to 56k)
€ Wide-R ange Analog C apability Including
Audio (50Hz-28kHz)
€ P ower-Down and C T S F unctions
€ 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 7/2/03
H
-P
IGH
ERFORMANCE
RF MODULE
TXM-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 #
TXM-900-HP3-PPO
TXM-900-HP3-PPS
TXM-900-HP3-S PO
TXM-900-HP3-S PS
MDE V-900-HP3-PPS
MDE V-900-HP3-S PS
DE S C R IP T ION
HP-3 Transmitter (PINNE D 8 C H only)
HP-3 Transmitter (PINNE D 8p /100s C H)
HP-3 Transmitter (S MD 8 C H only)
HP-3 Transmitter (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 HP-3 series
Summary of Contents for Linx HP-3 series
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Page 1: Ordering Information
HP -3 receiver, a reliable link is created for transferring 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. -
Page 2: Transmitter Specifications
TRANSMITTER 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 –... -
Page 3: Typical Performance Graphs
Absolute Maximum Ratings: Supply voltage Vcc, using pin 7 -0.3 +18 VDC Operating temperature -30°C +85°C Storage temperature -45°C +85°C Soldering temperature +260°C for 10 sec. Any input or output pin -0.3 *NOTE* Exceeding any of the limits of this section may lead to permanent damage of the device. -
Page 4: Pin Description
PIN DESCRIPTION PIN # PIN Name Equivalent CTK Description SMD Pinned Ground RF/ANT Out 50 Ohm RF Output Channel Select 0 Channel Select 1/Serial Select Clock CS1/SS CLOCK CS2/SS DATA Channel Select 2 /Serial Select Data Clear-to-Send Output 430K Power Down (Active Low) Voltage Input 2.8-16V Ground/Mode... - Page 5 RECOMMENDED PAD LAYOUT The following drawings illustrate the recommended circuit-board footprints for the HP-3 series transmitter modules. Be sure to also review the physical layout and the antenna recommendations contained elsewhere in this guide. Pinned Transmitter Surface-Mount Transmitter 0.070"...
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Page 6: Production Guidelines
Pinned Transmitter 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 Washability The modules are wash-resistant, but are not hermetically sealed. Linx recommends wash-free manufacturing techniques, however, the modules can be subjected to a wash cycle provided that a drying time is allowed prior to applying electrical power to the parts.
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Page 8: Theory Of Operation
Amplifier Filter RF Out Figure 14: HP-3 Series Transmitter Block Diagram The TXM-HP3 is a high-performance, multi-channel RF transmitter capable of transmitting both analog (FM) and digital (FSK) information. FM/FSK modulation offers significant advantages over AM or OOK modulation methods including increased noise immunity and the receiver's ability to "capture"... -
Page 9: Board Layout Guidelines
The trace from the transmitter to the antenna should be kept as short as possible. For runs greater than 1/4 inch use 50-ohm coax or a 50-ohm microstrip transmission line as shown below. Handy software for calculating microstrip lines is available on the Linx website (www.linxtechnologies.com). Effective Dielectric... -
Page 10: Power Supply Guidelines
POWER SUPPLY GUIDELINES The user must provide a clean source of module power to the transmitter to ensure proper operation. The HP-3 incorporates a precision low-dropout regulator on-board which allows operation over an input voltage range of 2.8 to 13 VDC. Figure 18 shows a typical supply >22µF .1µF filter. -
Page 11: Channel Selection
A typical software routine can complete the loading sequence in under 200µS. A sample routine is available on the Linx website. NOTE: When the module is powered up in the serial mode it will default to channel 50 until programmed by user software. - Page 12 CTS pin or to wait a fixed time. INPUTTING ANALOG SIGNALS The HP-3 series transmitter is capable of sending a wide range of analog signals including audio. The ability of the HP-3 to send combinations of audio and data also opens new areas of opportunity for creative design.
- Page 13 INPUTTING DIGITAL DATA The data input pin may be directly connected to virtually any digital peripheral including microcontrollers, encoders, and UART’s. The data input has an impedance of 200kΩ and can be used with any data that transitions from 0V to a 3V-5V peak amplitude within the specified bandwidth of the module.
- Page 14 "bit-banged" to create a data stream. While many RF solutions impose complex formatting and balancing requirements, the HP-3 series was designed to be as transparent as possible. The HP-3 does not encode or packetize the data in any manner. This transparency gives the designer tremendous flexibility in the structure of a protocol.
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Page 15: Timing Considerations
There are two major timing considerations the engineer must be aware of when designing with the HP-3 Series transmitter. These are shown in the table below. Remember the stated timing parameters assume a stable supply of 2.8 volts or greater. They do not include the charging times of external capacitance on the module's supply lines, the overhead of external software execution, or power supply rise times. -
Page 16: Interference Considerations
PROTOCOL CONSIDERATIONS (CONT.) The procedure here is protocol-dependent, but to illustrate let's consider the packet format outlined on the preceding page 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 actually to find the start bit. - Page 17 GENERAL ANTENNA RULES The following general rules should help in maximizing antenna performance: 1. 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.
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Page 18: Antenna Considerations
Figure 26: Linx Antennas repeatability and legal compliance. For complete details on the Linx antenna line, visit the Linx website at www.linxtechnologies.com, or call (800)736-6677 The following sections look at some of the basic considerations involved in the design and selection of antennas. - Page 19 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 employed with the HP-3 Series. Following is a brief discussion of styles commonly utilized in compact RF designs.
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Page 20: Legal Considerations
Linx Technologies to determine the specific suitability of the module to your application. All Linx modules are designed with the approval process in mind and thus much of the frustration that is typically experienced with a discrete design is eliminated. -
Page 21: Helpful Application Notes From Linx
As you proceed with your design you may wish to obtain one or more of the following application notes, which address in depth key areas of RF design and application of Linx products. These applications notes are available on-line at www.linxtechnologies.com or by contacting the Linx literature department. - 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 Data Sheet is believed to be accurate as of the time of publication. Specifications are based on representative lot samples. Values may vary from lot to lot and are not guaranteed. Linx Technologies makes no guarantee, warranty, or representation regarding the suitability of any product for use in a specific application.
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