FM TRANSMITTER & RECEIVER
YBRID ODULES
FM-RTFQ SERIES
FM-RRFQ SERIES
H
M
.
RRFQ1 Mechanical Details
38.1mm
4mm
18.3mm
Component Side
1
3
7
11
15
Pin Dimensions :
0.25mm x 0.50mm
2.54mm
RRFQ2 Mechanical Details
45.72mm
3mm
16.5mm
1mm
Component Side
1
2
14
18
Pin Dimensions :
0.25mm x 0.50mm
2.54mm
Pin Description
RRFQ1
1
RSSI Output*
RRFQ2
Pin Description
RF In (dBm)
-120
-110
-100
-90
RSSI (V)
16
2,15
1
+Vcc
GND
1.20
1.32
1.50
1.78
2.06
2.35
2.62
2.72
2.75
2, 7,11
3
12
Data In (Antenna)
NC
13
14
17
Received Signal Strength Output
AF Output
Data Out
-80
-70
N/A
14
15
18
N/A
-60
-50
-40
Power Down
0V = Standby
5V = Operating
RSSI Output
The RSSI provides a DC Voltage proportional to the peak value of the receive data signal. This output can be
used as an indicator for the received signal strength to use in wake-up circuits etc.
An RC circuit is normally used to provide the timing for the RSSI signal. The modules have a 10nF capacitor
internally connected to GND, therefore a pull down resistor (to GND) connected to the RSSI pin may be used to
generate a simple RC network time constant for the RSSI signal output.
Please note that the maximum output current is typically 950µA, the discharge current is lower than 2µA
DS069-8 Aug 07
©2007 Reg. No. 227 4001, England
Page 4
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