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FM Radio Transmitter & Receiver Modules
T5 / R5
Features * * * * * *
Miniature SIL package Fully shielded Data rates up to 128kbits/sec Range up to 300 metres Single supply voltage Industry pin compatible
T5-434 * Temp range * * *
-20C to +55C
No adjustable components High shock resistance Temperature compensated RF output
R5-434 * High sensitivity * Analogue / Digital Outputs * Signal strength output (RSSI) * On board AGC * Single conversion FM Super-Het * Double RF filtering (inc saw front end)
Applications * Vehicle alarm systems * Remote gate controls * Garage door openers * Domestic and commercial security General Description
The T5 and R5 data link modules are miniature UHF radio modules, which enable the implementation of a simple telemetry link upto 300 metres, and at data rates of up to 128Kbit/s The T5 and R5 modules will suit one-to-one and multi-node wireless links in applications including building and car security, remote industrial process monitoring and computer networking. The `B' derivative parts offer a cost reduced version.
The receiver is based on the classical superhet single conversion architecture utilising a PLL xtal referenced oscillator which yields a highly stable IF frequency (10.7 MHz). This hence allows use of high Q bandpass filters offering excellent adjacent channel rejection and hence high interference Immunity. Because of its small size and low power requirements, these modules are ideal for use in portable battery powered wireless applications.
DS305-8
Nov `05
(c)2005 REG No 277 4001, England.
Page 1
FM Radio Transmitter & Receiver Modules
Connection Diagram
T5 / R5
T5
R5
1
2
3
4
5
12 34567
Figure 1: Transmitter
Figure 2: Receiver
Pin Descriptions:
RF GND (pin 1) RF ground pin, internally connected to pin 4 (0V). This pin should ideally be connected to the nearest ground plane (e.g. coax braid, main PCB ground plane etc.) RF OUT (pin2) 50 RF antenna output. To achieve best results the antenna impedance must match that of the module. VCC (pin 3) +Ve supply pin (3.0 to 9.0 volts). The module will generate RF when VCC is present. It is strongly recommended that a 100nF capacitor decouples the supply rail as close as possible to this pin. GND (pin 4) Supply and data ground connection, connected to pin 1. Data IN (pin 5) This input has an impedance of 47K and should ideally be driven by a CMOS logic drive or compatible. The drive circuitry should be supplied with the same supply voltage as the Tx module. Ordering Information:
RF IN (pin 1) 50 RF input from antenna, connect using shortest possible route. This input is isolated from the internal circuit using the air gap of the front end SAW RF filter RF GND (pin 2) RF ground connection, preferable connected to a solid plane. RSSI (pin 3) The Received Signal Strength Indicator provides a DC output voltage proportional to the RF input signal. The amplitude of the RSSI voltage increases with increasing RF signal strength. GND (pin 4) Connect to power supply ground. VCC (pin 5) +Ve supply pin. Operation from a 5V supply able to source6mA at less than Vp-p ripple. AF (pin 6) Audio frequency output. DATA OUT (pin 7) CMOS compatible output. This may be used to drive external decoders. To reduce any noise on this output ass a Add a 56pF cap from this pin to GND. Part No R5-434-5-20 R5-434-5-20B R5-434-5-50 R5-434-5-50B R5-434-5-128 Description Rx 433.92MHz 20Kbps Rx 433.92MHz 20Kbps `B part' Rx 433.92MHz 5V 50Kbps Rx 433.92MHz 5V 50Kbps `B part' Rx 433.92MHz 5V 128Kbps
Part No T5-434-9-20 T5-434-5V T5-434-5-20B T5-434-3V T5-434-3-20B
Description Tx 433.92MHz 9v 20Kbps Tx 433.92MHz 5v 128Kbps Tx 433.92MHz 5v 20Kbps `B part' Tx 433.92MHz 3v 50Kbps Tx 433.92MHz 3v 20Kbps `B part'
DS305-8
Nov `05
(c)2005 REG No 277 4001, England.
Page 2
FM Radio Transmitter & Receiver Modules
T5 / R5
Absolute Maximum Ratings: Transmitter T5
Operating temperature: Storage temperature: Supply Voltage (pin 3) Data input (pin 5) RF Out (pin 2) -20C to +55C -40C to +100C 10V 10V 50V @ < 10MHz , +20dBm @ > 10MHz
Electrical Characteristics: Transmitter T5
Please note that the `B' devices are supplied without can shield. pin DC LEVELS Supply voltage 3V Versions Supply voltage 5V Versions Current & RF POWER Standard T5 Devices Supply current @ VCC = 5V RF power T5'B' Devices Supply current @ VCC = 3V Supply current @ VCC = 5V RF power @ VCC = 3V RF power @ VCC = 5V RF & Data 2nd harmonic Harmonics @ > 1GHz Initial frequency accuracy Overall frequency accuracy Modulation bandwidth @ -3dB Modulation distortion (THD) Power up time to full RF Standard T5 Devices Data rate Standard Data pulse width T5'B' Devices Data rate Standard Data pulse width 3 3 Min. 2 4.5 typ. 3.0 5.0 Max. 4 5.5 units Volts Volts notes
3 2 3 3 2 2 4 5.5 3 7
9 6 8
12 +12 8 9.5 +7 +10
mA dBm mA mA dBm dBm dBc dBc KHz KHz KHz % ms
1 1 1 1 1 1 1 1
-50 -46 50 75 10 1 128,000 40
bits/s s bits/s s
20,000 500
Notes 1. Measured into a 50 impedance 2. The limit for European spec EN300-220 is -36dBm
DS305-8
Nov `05
(c)2005 REG No 277 4001, England.
Page 3
FM Radio Transmitter & Receiver Modules
Absolute Maximum Ratings: Receiver R5
Operating temperature: Storage temperature: Supply Voltage (pin 5) RF Input (pin 1) -10C to +55C -40C to +100C 7V +20dBm
T5 / R5
Electrical Characteristics: Standard Receiver R5
min. DC LEVELS Supply voltage Supply current Supply ripple Data output high Data output low RF RF sensitivity IF Bandwidth Initial signal accuracy Max. RF input E.M.C Spurious responses upto 1GHz LO leakage, conducted LO leakage, radiated Image Rejection Dynamic Timings Power up to stable data (With RF signal present) 30 5 5 35 7 7 2.5 1 1 1 50 20 7 6000 700 300 mS mS mS mS mS mS mS uS US uS 20Kbps Part 50Kbps Part 128Kbps Part 20Kbps Part 50Kbps Part 128Kbps Part All Versions 20Kbps Part 50Kbps Part 128Kbps Part 4.5 typ. 5.0 6 =>4.0 <=0.5 -105 230 25 20 <60 <60 <60 50 Max. 5.5 10 units Volts mA mVp-p V V dBm KHz KHz dBm dB dBm dBm dBm notes
1
Signal to stable data (With power supply already on) Power up to valid RSSI (With RF signal present) Data Pulse Widths (SeeNote 2)
0.5
1. IF bandwidth available down to 27KHz 2. The data slicer is optimised for a 50:50 duty cycle, hence for reliable communications data should be encoded using a suitable scheme such as Manchester Encoding, though pulse width modulation up to 30:70/70:30 can also be utilised.
DS305-8
Nov `05
(c)2005 REG No 277 4001, England.
Page 4
FM Radio Transmitter & Receiver Modules
T5 / R5
Electrical Characteristics: Receiver R5 `B' Parts
Please note that the `B' devices are supplied without can shield. min. typ. DC LEVELS Supply voltage 4.5 5.0 Supply current 6 Supply ripple Data output high =>4.0 Data output low <=0.5 RF RF sensitivity IF Bandwidth Initial signal accuracy Max. RF input E.M.C Spurious responses upto 1GHz LO leakage, conducted LO leakage, radiated Image Rejection Dynamic Timings Power up to stable data (With RF signal present) Signal to stable data (With power supply already on) Power up to valid RSSI (With RF signal present) Data Pulse Widths (SeeNote 2) 50 20 -103 230 22 20 <60 <60 <60 60 30 5 35 7 2.5 1 1 6000 700 Max. 5.5 10 units Volts mA mVp-p V V dBm KHz KHz dBm dB dBm dBm dBm mS mS mS mS mS uS uS 20Kbps Part 64Kbps Part 20Kbps Part 64Kbps Part All Versions 20Kbps Part 50Kbps Part notes
1
3. IF bandwidth available down to 27KHz 4. The data slicer is optimised for a 50:50 duty cycle, hence for reliable communications data should be encoded using a suitable scheme such as Manchester Encoding, though pulse width modulation up to 30:70/70:30 can also be utilised.
DS305-8
Nov `05
(c)2005 REG No 277 4001, England.
Page 5
FM Radio Transmitter & Receiver Modules
Antenna Design
The design and positioning of the antenna is as crucial as the module performance itself in achieving a good wireless system range. The following will assist the designer in maximising system performance. The antenna should be kept as far away from sources of electrical interference as physically possible. If necessary, additional power line decoupling capacitors should be placed close to the module. The antenna `hot end' should be kept clear of any objects, especially any metal as this can severely restrict the efficiency of the antenna to receive power. Any earth planes restricting the radiation path to the antenna will also have the same effect. Best range is achieved with either a straight piece of wire, rod or PCB track @ 1/4 wavelength (15.5cm @ 433.92MHz). Further range may be achieved if the 1/4 wave antenna is placed perpendicular in the middle of a solid earth plane measuring at least 16cm radius. In this case, the antenna should be connected to the module via some 50 ohm characteristic impedance coax
T5 / R5
RSSI Values:
The R5 RSSI output provides a DC output proportional to the RF input signal. The table below shows the typical RSSI value depending on the RF signal strength. The circuit diagram shows how a carrier detect can be obtained from the RSSI pin on the receiver module. RF Signal Strength / dBm RSSI / V
RF Signal Strength / dBm -120 -110 -100 -90 -80 -70 -60 -50 -40
RSSI / V 1.27 1.33 1.49 1.74 1.99 2.3 2.56 2.63 2.63
Carrier Detect circuit
The R5 RSSI output provides a DC output proportional to the RF input signal. In order to generate a Carrier Detect (as a logic level) The following circuit may be used.
Helical Antenna
RF
5V
34mm @ 433MHz 17 turns equally spaced = 5mm (inside)
10 K ohm
RSSI OUT PIN 3
39 K ohm
CD
Whip Antenna
62 K ohm
RF 15.5cm @ 433MHz
GND
Figure 3: Antenna Configurations To Be Used With The T5 & R5 Modules
DS305-8
Nov `05
(c)2005 REG No 277 4001, England.
Page 6
FM Radio Transmitter & Receiver Modules
Application Circuits
T5 / R5
The following circuits show a remote control system with `self learning feature' for more information please see Datasheet DS600
Transmitter Circuit
Vcc
Sw 4
Sw 3
Sw 2
Sw 1
Transmit LED
Pull Up Resistor 2K2
12
T5
345
1 2 3 4
S0 S1
Vcc
LED
8 7 6 5
Serial Data Output BC848 10K
RF600E
S2 S3 DO
GND
Receiver Circuit
Vcc
O/P 1 O/P 2
RF Receiver
12 34567
1K
18
OP2 OP3 OP4
1 2
O/P 3 O/P 4 Transmitter Low Battery
17
OP1
16
N/C N/C
LB
Vcc
3 4 5 6 7 8 9
Status LED L Option Links M
15 14
15K
Vcc
RF600D
GND ECS
13
Sleep
FM / IR
22K Fit One Resistor Only
12
LKIN ECLK EDAT
11
SD1
10
LRN
IN
AM
22K
1K Learn Switch Data Input
Serial Data Output
DS305-8
Nov `05
(c)2005 REG No 277 4001, England.
Page 7
FM Radio Transmitter & Receiver Modules
Mechanical Dimensions
31.5 mm 3.0 mm
T5 / R5
10.5 mm
T5
20.32 mm 1.5mm 1 2 3 4 5
Pin spacings 2.54 mm Pin Dia 0.5mm All dimensions +/- 0.5mm
3.5mm
Figure 6: Transmitter
48 mm
4.65mm
17.5mm
R5 pin spacing 2.54mm
12 30.48mm
Pin spacings 2.54 mm Pin Dia 0.5mm pin 1 is 2.33mm from edge of module All dimensions +/- 0.5mm
34567
Figure 7: Receiver Should you require further assistance please contact: R F Solutions Ltd., Unit 21, Cliffe Industrial Estate, South Street, Lewes, E. Sussex. BN8 6JL, England Tel: +44 (0)1273 898 000 Email : sales@rfsolutions.co.uk Fax: +44 (0)1273 480 661 http://www.rfsolutions.co.uk
Information contained in this document is believed to be accurate , however no representation or warranty is given and no liability is assumed by R.F. Solutions Ltd. With respect to the accuracy of such information. Use of R.F.Solutions as critical components in life support systems is not authorised except with express written approval from R.F.Solutions Ltd.
DS305-8
Nov `05
(c)2005 REG No 277 4001, England.
Page 8

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