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
-20°C to +55°C
•
No adjustable components
•
High shock resistance
•
Temperature compensated RF output
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.
DS305-7
Feb ‘04
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)
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.
©2004 REG No 277 4001, England.
Page 1
FM Radio Transmitter & Receiver Modules
T5 / R5
Connection Diagram
T5
R5
1
2
3
4
5
Figure 1: Transmitter
1 2
3 4 5 6 7
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 IN (pin 1)
50Ω 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 OUT (pin2)
50Ω RF antenna output. To achieve best results
the antenna impedance must match that of the
module.
RF GND (pin 2)
RF ground connection, preferable connected to a
solid plane.
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 47KΩ 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.
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.
Ordering Information:
Part No
T5-434-9-20
Description
Tx 433.92MHz 9v 20Kbps
Part No
T5-434-5V
Tx 433.92MHz 5v 50Kbps
R5-434-5-20
Rx 433.92MHz 20Kbps
T5-434-5-20B
T5-434-3V
T5-434-3-20B
T5-434-128
Tx 433.92MHz 5v 20Kbps ‘B part’
Tx 433.92MHz 3v 50Kbps
Tx 433.92MHz 3v 20Kbps ‘B part’
Tx 433.92MHz 5v 128Kbps
R5-434-5-20B
Rx 433.92MHz 20Kbps ‘B part’
R5-434-5-50
Rx 433.92MHz 5V 50Kbps
R5-434-5-50B
Rx 433.92MHz 5V 50Kbps ‘B part’
R5-434-5-128
Rx 433.92MHz 5V 128Kbps
DS305-7
Feb ‘04
©2004 REG No 277 4001, England.
Description
Page 2
FM Radio Transmitter & Receiver Modules
T5 / R5
Absolute Maximum Ratings: Transmitter T5
Operating temperature:
Storage temperature:
-20°C to +55°C
-40°C to +100°C
Supply Voltage (pin 3)
Data input (pin 5)
RF Out (pin 2)
10V
10V
±50V @ < 10MHz , +20dBm @ > 10MHz
Electrical Characteristics: Transmitter T5
Please note that the ‘B’ devices are supplied without can shield.
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
pin
Min.
typ.
Max.
units
3
3
2
4.5
3.0
5.0
4
5.5
Volts
Volts
9
12
+12
mA
dBm
1
1
8
9.5
+7
+10
mA
mA
dBm
dBm
1
1
1
1
-50
-46
±50
±75
dBc
dBc
KHz
KHz
1
1
10
KHz
%
µs
3
2
3
3
2
2
4
5.5
3
7
RF & Data
2nd harmonic
Harmonics @ > 1GHz
Initial frequency accuracy
Overall frequency accuracy
Modulation bandwidth @ -3dB
Modulation distortion (THD)
Power up time to full RF
6
8
10
Standard T5 Devices
Data rate Standard
Data pulse width
40
T5’B’ Devices
Data rate Standard
Data pulse width
500
50000
bits/s
µs
20,000
bits/s
µs
notes
Notes
1. Measured into a 50Ω impedance
2. The limit for European spec EN300-220 is –36dBm
DS305-7
Feb ‘04
©2004 REG No 277 4001, England.
Page 3
FM Radio Transmitter & Receiver Modules
T5 / R5
Absolute Maximum Ratings: Receiver R5
Operating temperature:
Storage temperature:
-10°C to +55°C
-40°C to +100°C
Supply Voltage (pin 5)
RF Input (pin 1)
7V
+20dBm
Electrical Characteristics: Standard Receiver R5
DC LEVELS
Supply voltage
Supply current
Supply ripple
Data output high
Data output low
min.
typ.
Max.
units
4.5
5.0
6
=>4.0
<=0.5
5.5
Volts
mA
mVp-p
V
V
-
10
RF
RF sensitivity
IF Bandwidth
Initial signal accuracy
Max. RF input
-105
230
±25
20
dBm
KHz
KHz
dBm
E.M.C
Spurious responses upto 1GHz
LO leakage, conducted
LO leakage, radiated
Image Rejection
<60
<60
<60
50
dB
dBm
dBm
dBm
notes
1
Dynamic Timings
Power up to stable data
(With RF signal present)
Signal to stable data
(With power supply already on)
30
5
5
35
7
7
mS
mS
mS
20Kbps Part
50Kbps Part
128Kbps Part
0.5
2.5
1
1
mS
mS
mS
20Kbps Part
50Kbps Part
128Kbps Part
1
mS
All Versions
6000
700
300
uS
US
uS
20Kbps Part
50Kbps Part
128Kbps Part
Power up to valid RSSI
(With RF signal present)
Data Pulse Widths
(SeeNote 2)
50
20
7
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.
DS305-7
Feb ‘04
©2004 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
Max.
units
5.5
Volts
mA
mVp-p
V
V
10
RF
RF sensitivity
IF Bandwidth
Initial signal accuracy
Max. RF input
-103
230
±22
20
dBm
KHz
KHz
dBm
E.M.C
Spurious responses upto 1GHz
LO leakage, conducted
LO leakage, radiated
Image Rejection
<60
<60
<60
60
dB
dBm
dBm
dBm
Dynamic Timings
Power up to stable data
(With RF signal present)
30
5
Signal to stable data
(With power supply already on)
50
20
1
35
7
mS
mS
20Kbps Part
64Kbps Part
2.5
1
mS
mS
20Kbps Part
64Kbps Part
1
mS
All Versions
6000
700
uS
uS
20Kbps Part
50Kbps Part
Power up to valid RSSI
(With RF signal present)
Data Pulse Widths
(SeeNote 2)
notes
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.
DS305-7
Feb ‘04
©2004 REG No 277 4001, England.
Page 5
FM Radio Transmitter & Receiver Modules
T5 / R5
Antenna Design
RSSI Values:
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 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.
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 @ ¼ wavelength
(15.5cm @ 433.92MHz). Further range may be
achieved if the ¼ 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
RF Signal Strength / dBm RSSI / V
RF Signal Strength / dBm
-120
-110
-100
-90
-80
-70
RSSI / V
1.27
1.33
1.49
1.74
1.99
2.3
-60
-50
-40
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
5V
RF
10 K ohm
34mm @ 433MHz
17 turns equally spaced
∅ = 5mm (inside)
RSSI OUT
PIN 3
CD
39 K ohm
Whip Antenna
62 K ohm
RF
15.5cm @ 433MHz
GND
Figure 3: Antenna Configurations To Be Used
With The T5 & R5 Modules
DS305-7
Feb ‘04
©2004 REG No 277 4001, England.
Page 6
FM Radio Transmitter & Receiver Modules
T5 / R5
Application Circuits
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
Transmit
LED
Sw 1
Pull Up Resistor
2K2
T5
3 4 5
1 2
1
2
3
4
S0
Vcc
S1
LED
RF600E
S2
DO
S3
GND
8
Serial Data
Output
7
6
5
BC848
10K
Receiver Circuit
Vcc
O/P 1
O/P 2
RF Receiver
12
18
1KΩ
OP2
OP3
OP1
OP4
16
15
Status
LED
L
Option
Links
LB
N/C
Vcc
N/C
14
Vcc
13
M
O/P 3
2
17
3 4 5 6 7
1
RF600D
GND
Sleep
ECS
LKIN
ECLK
SD1
EDAT
LRN
IN
12
11
10
O/P 4
Transmitter
Low Battery
3
4
15KΩ
5
6
FM / IR
7
Fit One
Resistor Only
8
9
22KΩ
AM
22KΩ
1KΩ
Learn
Switch
Data
Input
Serial Data
Output
DS305-7
Feb ‘04
©2004 REG No 277 4001, England.
Page 7
FM Radio Transmitter & Receiver Modules
T5 / R5
Mechanical Dimensions
3.0 mm
31.5 mm
10.5 mm
T5
20.32 mm
1
1.5mm
2
3
4
Pin spacings 2.54 mm
Pin Dia 0.5mm
All dimensions +/- 0.5mm
5
3.5mm
Figure 6: Transmitter
48 mm
4.65mm
17.5mm
R5
pin spacing 2.54mm
1 2
3 4 5 6 7
30.48mm
Pin spacings 2.54 mm
Pin Dia 0.5mm
pin 1 is 2.33mm from edge of module
All dimensions +/- 0.5mm
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
Fax: +44 (0)1273 480 661
Email : sales@rfsolutions.co.uk
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.
DS305-7
Feb ‘04
©2004 REG No 277 4001, England.
Page 8
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