rx1-173.200-10 Radiometrix Ltd, rx1-173.200-10 Datasheet - Page 6

• Manufacturer Part Number: rx1-173.200-10
• Description: Left Tx1 Transmitter Right Rx1receiver
• Manufacturer: Radiometrix Ltd

Module test circuits
Power supply requirements
Both modules have built-in regulators which deliver a constant 2.85V to the module circuitry when the
external supply voltage is 2.9V or greater, with 40dB or more of supply ripple rejection. This ensures
constant performance up to the maximum permitted rail, and removes the need for external supply
decoupling except in cases where the supply rail is extremely poor (ripple/noise content >0.1V
Note, however, that for supply voltages lower than 2.85V the regulator is effectively inoperative and
supply ripple rejection is considerably reduced. Under these conditions the ripple/noise on the RX1
supply rail should be below 20mV
recommended that a 10 F tantalum or similar capacitor be added between pin 7 of the module (Vcc)
and ground together with a 10
The Enable pin allows the module to be turned on or off under logic control with a constant DC supply
to the Vcc pin. The module current in power-down mode is less than 1 A.
NOTE: If this facility is used, the logic control signal must have a slew rate of 40mV/ s or more. Slew
rates less than this value may cause erratic operation of the on-board regulator and therefore the
module itself.
The Enable pin should be tied directly to the Vcc pin if this facility is not required.
Radiometrix Ltd., TX1 & RX1 Data Sheet
RF in
50
RF out
50
RX1
1
2
Radiometrix
TX1
1
3
Applications information
2
series feed resistor between pin 7 and the supply rail.
3
p-p
to avoid problems. If the quality of the supply is in doubt, it is
Fig.6: RX1 test circuit
Fig.5: TX1 test circuit
4
5
6
4
Radiometrix
7
5
6
7
TXD
En
0V (GND)
Vcc
8
9
5kHz max.
RXD
Vcc
RSSI
En
0V (GND)
AF out
3V
0V
p-p
).
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