T7 / R7
T7G / R7G
FM 433MHz Narrow Band
Transmitter Connection Diagram
Receiver Connection Diagram
T7
R7
1
1
2
3
4
5
2
3 4 5 6 7
Figure 2: Narrow Band R7 / R7G Receivers
Figure 1: Narrow Band T7 / T7G Transmitters
Pin Description:
Pin Description:
RF GND (pin 1)
RF IN ( 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. ).
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.
RF OUT (pin 2)
50 Ohm RF antenna output. To achieve best
results, the antenna impedance must match that
of the module.
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.
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.
GND (pin 4)
Connect to power supply ground.
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.
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.
DS307-7 Oct 05
©2004 REG No 277 4001, England.
Page 5
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