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QMR1-434 Datasheet(PDF) 4 Page - rfsolutions.ltd |
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QMR1-434 Datasheet(HTML) 4 Page - rfsolutions.ltd |
4 / 8 page Ds302_3 AUG 01 © ©2001 REG No 277 4001 England Page 4 QM Receiver Module QMR1 / QMR2 QMR2 Details QMR2 1 2 3 4 5 6 7 Figure 3 QMR2 Receiver 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 ) Supply ground connection. Preferably connected to a solid ground plane. RSSI ( pin 3 ) This is a dc output voltage that is proportional to the RF signal strength applied to pin 1. GND ( pin 4 ) Connected to power supply ground. Vcc ( pin 5 ) +Ve supply pin. Operation from a 5V supply able to source 6mA at less than Vp-p ripple. AF ( pin 6 ) Audio frequency output. Note Source current is limited to 40 microA. In most applications a buffer may be required to interface to this pin. DATA OUT ( pin 7 ) CMOS compatible output. This may be used to drive external decoders. General Information Phase Lock Loop RF AMP Band Pass Filter IF AMP Low Pass Filter Detector Antenna Mixer Figure 4: Receiver Block Diagram The QMR2 receiver module is a FM single conversion superhet receiver capable of handling data rates of up to 10Kbits/s. With an on board data buffer, phase locked loop and a high quality front end RF stage, a –107dBm sensitivity is achieved. Utilising the latest phase locked loop receiver technology with one of the compatible transmitter modules will yield a highly efficient wireless link. RSSI Values RF Level (dBm) pin 3 RSSI (volts) pin 6 -110 1.16 -100 1.34 -90 1.59 -80 1.78 -70 1.81 -60 1.81 -50 2.17 -40 2.45 -30 2.52 -20 2.52 -10 2.52 |
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