FM 433MHz Narrow Band
Transmitter Connection Diagram
T7 / R7
T7G / R7G
Receiver Connection Diagram
T7
R7
1
2
3
4
5
1 2
3 4 5 6 7
Figure 1: Narrow Band T7 / T7G Transmitters
Figure 2: Narrow Band R7 / R7G Receivers
Pin Description:
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. ).
Pin Description:
RF IN ( pin 1)
50 Ohm 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, preferably connected to a
solid ground plane.
RSSI / Carrier Detect
(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. A
simple transistor interface can yield a carrier
detect logic output.
GND
(pin 4)
Connect to power supply ground.
VCC
(pin 5)
+Ve supply pin. Operation from a 5V supply able
to source 10mA at less than 10mV p-p ripple.
AF
(pin 6)
Audio frequency output ( max 40microA source )
DATA OUT
(pin 7)
CMOS compatible output. This may be used to
drive external decoders. To reduce any noise on
this output add a 56pF cap from this pin to GND.
RF OUT
(pin 2)
50 Ohm RF antenna output. To achieve best
results, the antenna impedance must match that
of the module.
Vcc
(pin 3)
+Ve supply pin. The module will generate RF
when Vcc is present.
GND
(pin 4)
Supply and data ground connection, connected to
pin 1.
Data IN (pin 5)
This input has an impedance of 47K Ohms 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.
DS307-7 Oct 05
©2004
REG No 277 4001, England.
Page 5
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