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BIM-418-10

器件型号:BIM-418-10
文件大小:527.96KB,共0页
厂商名称:RADIOMETRIX [Radiometrix Ltd]
厂商官网:http://www.radiometrix.com
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BIM-418-10器件文档内容

         Radiometrix                                                                              SILRX-UHF

                                         Hartcran House, Gibbs Couch, Watford, WD19 5EZ, England

Issue 3, 13 April 2001 Tel: +44 (0) 20 8428 1220, Fax: +44 (0) 20 8428

UHF Radio Telemetry Receiver Module

UK version:    SILRX-418-5 / SILRX-418-10
Euro version:  SILRX-433-5 / SILRX-433-10

The SILRX-418-5 and SILRX-433-5 integrate a
complete FM superhet UHF radio receiver on a
small module. Together with the matching TXM-
418-5 or TXM-433-5 transmitter a one-way radio
data link can be achieved over a distance upto 200
metres on open ground

Typical features include:                               left: TXM-418-5 transmitter right: SILRX-418-5 receiver

PCB mounting, space saving SIL style

418 MHz SAW controlled wide band FM reception

Selective double conversion superhet

Sensitive typ. 0.5V (-113 dBm) for 20 dB S/N

High data rates, 5kbps and 10kbps

Analogue and Digital data outputs

Carrier detect output

Fast enable time,< 3ms for duty cycle power save use

Wide supply range, 4.0V to 9.0V

Low current, 13 mA continuous, 130A on power save (100:1)

The SILRX radio receiver and the matching DTI (RA) approved transmitter (TXM-418-5) are self
    contained, PCB mounting modules capable of transferring analogue or digital data up to a distance
    of 200m.

The SILRX receiver module is particularly suitable for battery powered portable applications where it's
low power requirements and small size are of advantage. It may also be used as a lower cost option to
the RXM-418-10 in fixed applications where the higher data rates and signal strength output of the
RXM-418-10 are not required.

Typical applications include:-                      Paging car alarms
Site paging receivers                               Domestic and commercial security
Line powered telephone auto diallers                Medical Alert/Nurse Call system
Guard patrol/lone worker protection                 Remote industrial process monitoring
Mobile panic attack                                 Data transfer through hazardous environments
Battery powered half duplex data networks           Fire alarms
Lighting control, Garage door openers               Remote control, Access control
Picture/antique protection alarms
                                                                                                                              page 1
Radiometrix Ltd, SILRX-UHF Data Sheet
Brief description

The SILRX receiver is a double conversion FM superhet with a data slicer driven by the AF output.
Additionally a fast acting carrier detect signal is available to indicate to external circuits that a signal is
present. This signal is extremely useful when implementing duty cycle power save circuits (see fig 4) or
to indicate to external logic that a signal is being received. It is internally derived from the degree of
noise quieting due to the presence of a receive carrier.
The SILRX-418 is designed to work with the matching transmitter (TXM-418). With the addition of
simple antenna the pair may be used to transfer serial data up to 200m. The range of the radio link is
very variable and depends upon many factors, principally, the type of antenna employed and the
operating environment. The 200m quoted range is a reliable operating distance over open ground using
1/4 whip antenna at both ends of the link at 1.5m above ground. Smaller antenna, interference or
obstacles (e.g. building etc.) will reduce the reliable working range (down to 30m in extreme cases).
Increased antenna height, slow data or a larger receive antenna will increase the range (our best is
3km).
We recommend that the module evaluation kit, EVAL-418-A, can be used to assess the reliable working
range under the anticipated conditions of use.

The following figure shows the receiver's block diagram.

figure 1: Block diagram

  figure 2: Test cicuit                page 2

Radiometrix Ltd, SILRX-UHF Data Sheet
Pin Description

pin 1 RF IN      The receiver antenna connects to this input. It has nominal RF
                 impedance of 50 and is capacitively isolated from the internal circuit

pin 2 RF GROUND This pin should be connected to any ground plane against which the
                                         antenna works. It is internally connected to pin 4.

pin 3 DETECT     This pin may be used to derive a carrier detect to enable external circuits
                 when a signal is being received. If the detect function is not being used a

                 10 k pull-up to pin 5 (Vcc) should be connected. Refer to applications
                 note for further details on the use of this pin.

pin 4 0 volt     Ground for supply.

pin 5 Vcc        Positive supply of 4V to 9V 13 mA. The supply must be clean (<2mV pp)
                 stable and free of high frequency digital noise. A supply filter is
                 recommended unless the module is driven from it's own regulated supply.

pin 6 AF         This is the FM demodulator output. It has an standing DC bias of
                 approximately 1.4V and may be used to drive analogue data detectors

                 such as modem chips or DTMF decoders. Load impedances as low as 2 k
                 and up to 100 pF can be driven

pin 7 DATA       This digital output from the internal data slicer is a squared version of
.                the signal on pin 6 (AF) This signal is used to drive external digital
                 decoders, it is true data (i.e. as fed to the transmitters data input). Load

                 impedances as low as 1 k and up to 1 nF can be driven

     figure 3: Mechanical Dimensions:  page 3

Radiometrix Ltd, SILRX-UHF Data Sheet
Performance data SILRX-418-5 and SILRX-433-5

ambient temperature: 20C

supply voltage:     + 5 Volt

test circuit:       fig. 2

Parameter                              pin 5   Min.    Typical      Max.                  Units    Notes
Operating voltage range (Vcc)          pin 5     4.0        5.0               9.0               V       -
Supply current                                   11         14                 17             mA        -
Receive frequency                      pin 1       -                            -                       -
Overall frequency accuracy             pin 1    - 100    433.92                              MHz        1
Sensitivity for 20 dB S/N              pin 1       -         0              + 100             kHz       2
Carrier detect, threshold                          -        0.5               1.0              V       -
RF input impedance                     pin 6       -        0.5               2.0              V       -
IF bandwidth                           pin 6       -        50                  -                       3
AF output level                        pin 6       -                            -              
AF bandwidth                                     DC        250                  -             kHz     2, 3
Frequency/voltage conversion                       -       500                 5             mVpp       3
                                                                                -             kHz       -
                                                             -                             mV/kHz
                                                            10

Data output, Logic low                 pin 7   0       0.2                           0.8  V        4
                   Logic high          pin 7                                          5
                                               4.0     4.5                           20   V        5
Data bit duration                      pin 7                                        80 %
Data Mark:Space                                0.2           -                       15   ms       6
Data settling time
(minimum preamble duration)                    20 %          -                       2.5           7
                                                                                     0.5
                                               -             -                            ms       8

Enable time                            pin 3   -             -                            ms       3, 9
Signal detect time
                                       pin 3   -             -                            ms       3, 9

Notes: 1.           over supply and temperature range
             2.     25kHz deviation, 1 kHz tone
             3.     3V input
             4.     1mA sink
             5.     1mA source
             6.     time between transitions
             7.     (time high / time low) * 100 %, averaged over any 20 ms period
             8.     time from valid carrier detect to stable data output
             9.     from application of supply to carrier detect low (active)
             10.    from application of signal to carrier detect low (active)

Absolute maximum ratings:              - 0.3   to      + 10      V
Supply voltage Vcc, pin 5              - 10C  to
Operating temperature                  - 40C  to      + 50C
Storage temperature                            0 dBm
RF input, pin 1                        - 0.3   to      + 100C
Any input or output pin
                                                       Vcc V, 10 mA

Radiometrix Ltd, SILRX-UHF Data Sheet                                                                 page 4
Performance data SILRX-418-10 and SILRX-433-10

ambient temperature: 20C

supply voltage:                +5V

test circuit:                  fig. 2

Parameter                                     pin 5    Min.    Typical            Max.           Units    Notes
                                              pin 5
Operating voltage range (Vcc)                            4.0        5.0                     9.0        V       -
Supply current                                pin 1      11         14                      17       mA        -
Receive frequency                             pin 1        -     433.92                       -     MHz        -
Overall frequency accuracy                    pin 1     - 100        0                    + 100      kHz       1
Sensitivity for 20 dB S/N                                  -        1.0                     2.0       V       2
Carrier detect, threshold                     pin 6        -        2.0                     4.0       V       -
RF input impedance                            pin 6        -        50                        -                -
IF bandwidth                                  pin 6        -       250                        -      kHz       3
AF output level                                            -       500                        -     mVpp     2, 3
AF bandwidth                                             DC          -                      20       kHz       3
Frequency/voltage conversion                               -        10                        -   mV/kHz       -

Data output, Logic low                        pin 7    0                  0.2        0.8         V        4
                   Logic high                 pin 7                                   5
                                                       4.0                4.5         2          V        5
                                                                                    80 %
Data bit duration                                      0.05               -           5          ms       6
Data Mark:Space
Data settling time                                     20 %               -           1                   7
(minimum preamble duration)                                                          0.3
Enable time                                   pin 7    -                  -                      ms       8

                                              pin 3    -                  -                      ms       3, 9

Signal detect time                            pin 3    -                  -                      ms       3, 10

Notes: 1.           over supply and temperature range
             2.     25 kHz deviation, 1 kHz tone
             3.     3 V input
             4.     1mA sink
             5.     1mA source

6.                  time between transitions

7.                  (time high / time low) * 100 %, averaged over any 20 ms period

8.                  time from valid carrier detect to stable data output

9.                  from application of supply to carrier detect low (active)

10.                 from application of signal to carrier detect low (active)

Absolute maximum ratings:                     - 0.3    to      + 10            V
Supply voltage Vcc, pin 5                     - 10C   to
Operating temperature                         - 40C   to      + 50C
Storage temperature                                    0 dBm
RF input, pin 1                               - 0.3    to      + 100C
Any input or output pin
                                                               Vcc V, 10 mA

Radiometrix Ltd, SILRX-UHF Data Sheet                                                                        page 5
figure 4: Typical performance curves

figure 5: Timing wave forms           page 6

Radiometrix Ltd, SILRX-UHF Data Sheet
Antenna configurations

The positioning of the antenna is of the up most importance and is one of the main factors in
determining system range.

The following notes should assist in obtaining optimum performance:-

1. Keep it clear of other metal in the system, particularly the `hot' (top) end.

2. The best position by far, is sticking out the top of the product. This is often not desirable for
    practical/ergonomic reasons thus a compromise my need to be reached.

3. If an internal antenna must be used try to keep it away from other metal components, particularly
    large ones like transformers, batteries and PCB tracks/earth plane. The space around the antenna is
    as important as the antenna itself.

4. Keep it away from interference sources, bad interference can easily reduce system range by a factor
    of 5. High speed logic is one of the worst in this respect fast logic edges have harmonics which extend
    into the UHF band and the PCB tracks radiate these harmonics most efficiently. Single chip
    microprocessors and ground planed logic boards reduce this problem significantly.

The next diagrams (fig 6) show three different antenna configurations which can be used on both the
transmitter and the receiver. Additionally a coax fed external dipole or 1/4 wave ground plane antenna
may be considered if system range is paramount.

figure 6: Antenna configurations      page 7

Radiometrix Ltd, SILRX-UHF Data Sheet
Module Mounting considerations

1.  The module may be mounted vertically or bent horizontal to the motherboard.

2.  No conductive items should be placed within 4 mm of the modules' component side to prevent

    detuning.

3.  Observe RF layout practice between the module and it's antenna i.e. < 10 mm unscreened track,

    use 50 microstrip or coax for >10mm

4.  It is desirable, but not essential, to earth plane all unused area around the module.

5.  Mount as far as possible from high frequency interference sources, Microprocessors with

    external busses are totally incompatible with sensitive radio receivers and must be keep at least

    1 metre from the receive antenna. Single chip micros are not a problem.

6.  In some applications it is advantageous to remote the receiver and it's antenna away from the

    main equipment. This avoids any interference problems and allows flexibility in the sighting of

    the receive antenna for optimum RF performance.

Using the DETECT output

Pin 3 of the module may be used in several ways:-

1.  Pulled up to pin 5 (Vcc) with a 47 k resistor unmutes the AF and DATA outputs for normal

    operation.

2.  Pulled down to 0 Volts with a 47 k mutes the AF and DATA Outputs (both go to 0V).

3.  To drive the base of a PNP transistor (see fig 2) to derive a logic compatible carrier detect. The

    data detect output on pin 3 may be used for duty cycle power saving control in portable

    equipment where battery life is a problem. By pulsing the receiver on/off the average supply

    current may often be reduced by a factor of 20 or more depending upon the system

    requirements the data detect output is         valid 1.5 ms (2.5 ms worst case) after application

    of the supply and is used to inhibit the power saving while data decoding is done.

Internal data slicer

A CMOS compatible data output is available on pin 7, this output is normally used to drive a digital
decoder IC or a microprocessor which is performing the data decoding. The data slicer in the receive
module is designed to accept data with a wide range of pulse widths and mark: space ratio's, see
specification table for limiting values. The data slicer has a 10 ms transient response time this is the
settling time of the adaptive comparator, i.e. the first 10 ms of signal may be corrupt at the data output.

System coding

The transmit and receive modules have no internal digital coding/decoding thus allowing the flexibility
to send many types of data. Encoder and decoder IC's are required to give the system a high degree of
protection from false triggers due to noise/interference/neighbouring systems and often for security
reasons. There are wide range of suitable encoder/decoder IC's which may be used with the modules,
including :-

MM57C200, MM57410,National Semiconductor

UM3750, UMC

HT12 series, Holtek

MC145026 series, Motorola

AS2787, Austria Mikro Systeme International GmbH

Additionally IR. remote control, DTMF, Selcall and modem IC's can be easily interfaced to the modules.

Radiometrix Ltd, SILRX-UHF Data Sheet                                                      page 8
AF output

This output is the FM demodulator's output after buffering and filtering. Since it is taken before the
data slicer in the module, it may be used to drive external data slicers / demodulator's in cases where
the internal data slicer is not suitable. This is the case where an analogue subcarrier is being employed
e.g. 2 tone AFSK or DTMF tones. In these cases the AF output is used to drive the FSK / DTMF decoder
directly.

The AF output is also a very useful test point for monitoring signals or interference. The AF output is
DC coupled to the FM demodulator thus the DC level Varies with the frequency of the incoming signal.

Supply requirements

The module requires a clean supply. Noise and `hash' in the 5 to 500 kHz band and 16 MHz 1 MHz
must be less than 2 mV, We recommend a 10 F capacitor to ground on pin 5 (Vcc) and a 10 series feed
resistor in cases where the cleanness of the supply is in doubt.

.Warning:  Don't be tempted to adjust the trimmer on the module, it controls the receive
           frequency and can only be correctly set-up with an accurate RF signal generator!

Additional Reading

BS 0799             British standard for Wire-free intruder alarm systems

BS 4737             British standard for intruder alarm systems in buildings from British standards
                    institution - Tel. 44 171 629 900

MPT1340             DTI type approval specification for 418 MHz Telemetry from department of
Trade               and Industry - 44 171 211 0502/0505

ARRL Handbook       Excellent radio engineering text

ARRL Antenna Book Practical antenna design book

Radiometrix Ltd, SILRX-UHF Data Sheet                                      page 9
Applications note

Four Channel Receiver with battery saver

Fig 7 shows a simple four channel paging receiver with 256 setable codes. The CMOS 555 timer
provides a duty cycle power save circuit which latches ON when a signal is present. The values used in
the example give 4ms ON; 400 ms OFF, i.e. 1:100 duty cycle. The total quiescent current is less than
200A, thus a 9V alkaline battery (500 mA/hr) will give a life of over 2000 hours. The ON time is
determined by the receiver's power up settling time (3 ms worst case) + any tolerance of the duty cycle
oscillator. The OFF time is controlled by R8 in the circuit and should be selected to suit the application
depending upon the required response time and any limits imposed upon the duration of the
transmission. It is recommended that the OFF time be no longer than 1/2 for the transmission
preamble duration.

figure 7: Four Channel Receiver with power save

Ordering information
SAW based OEM Transmit and Receive modules.

TXM-418-5    UK Transmitter on 418 MHz, Type approved to MPT1340
TXM-418-10   Fast transmitter on 418 MHz, Type approved to MPT1340
RXM-418-5    matching UK receiver module on 418 MHz
SILRX-418-5  Low current UK receiver module on 418 MHz
BiM-418-10   Bi-directional short range module on 418 MHz
RPC-418-5    Self-contained module wich integrates the BiM transceiver with a Radio Packet
Controller
EVAL-418-A   Evaluation kit for TXM & RXM
EVAL-418-B   SILRX supplementary PCB for EVAL-418-A
BiM-KIT      Evaluation kit for BiM-UHF modules.

All modules are available in a 433.92 MHz version for use in other European countries.

Radiometrix Ltd, SILRX-UHF Data Sheet                                                   page 10
                          Radiometrix Ltd

                              Hartcran House
                                Gibbs Couch
                                   Watford
                                 WD19 5EZ
                                 ENGLAND

                         Tel: +44 (0)20 8428 1220
                         Fax: +44 (0)20 8428 1221
                         info@radiometrix.co.uk
                         www.radiometrix.co.uk

Copyright notice

This product data sheet is the original work and copyrighted property of Radiometrix
Ltd. Reproduction in whole or in part must give clear acknowledgement to the
copyright owner.

Limitation of liability

The information furnished by Radiometrix Ltd is believed to be accurate and reliable.
Radiometrix Ltd reserves the right to make changes or improvements in the design, specification
or manufacture of its subassembly products without notice. Radiometrix Ltd does not assume
any liability arising from the application or use of any product or circuit described herein, nor
for any infringements of patents or other rights of third parties which may result from the use of
its products. This data sheet neither states nor implies warranty of any kind, including fitness
for any particular application. These radio devices may be subject to radio interference and may
not function as intended if interference is present. We do NOT recommend their use for life
critical applications.
The Intrastat commodity code for all our modules is: 8542 6000

R&TTE Directive

After 7 April 2001 the manufacturer can only place finished product on the market under the
provisions of the R&TTE Directive. Equipment within the scope of the R&TTE Directive may
demonstrate compliance to the essential requirements specified in Article 3 of the Directive, as
appropriate to the particular equipment.
Further details are available on Radiocommunications Agency (RA) web site:

          http://www.radio.gov.uk/topics/conformity/conform-index.htm

The Library and Information Service       European Radiocommunications Office (ERO)
The Radiocommunications Agency            Midtermolen 1
Wyndham House                             DK 2100 Copenhagen
189 Marsh Wall                            Denmark
London                                    Tel. +45 35250300
United Kingdom                            Fax +45 35250330
E14 9SX                                   ero@ero.dk
Tel: +44 (0)20 7211 0502/0505             www.ero.dk
Fax: +44 (0)20 7211 0507
library@ra.gsi.gov.uk
For further information on radio matters
contact the Agency's 24 Hour Telephone
Enquiry Point: +44 (0)20 7211 0211
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