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USING THE RXM-***-ES FOR ANALOG APPLICATIONS
The ES Series is an excellent choice for sending a wide range of analog
information, including audio. The ability of the ES to receive combinations of
analog and digital signals also opens new areas of opportunity for creative
product design.
The transmission may contain simple or complex analog signals within the
specified audio bandwidth. Signal sources ranging from a single frequency to
complex content, such as audio, are handled with ease.
The AUDIO line of the receiver should be buffered and filtered to obtain
maximum signal quality. This is particularly important because the audio output
is AC-coupled, which means any DC loading will cause errors in the data slicer
since data is derived from the audio voltage. For voice, a 3-4kHz low-pass filter
is often employed. For broader-range sources, such as music, a 12-20kHz cutoff
may be more appropriate. When only sending audio, the DATA line should be
pulled to V CC to reduce noise resulting from the data slicer switching.
The Signal-to-Noise Ratio (SNR) of the audio will depend on the bandwidth you
select. The higher the SNR, the less hiss you will hear in the background. For
the best SNR, choose the lowest filter cutoff appropriate for the intended signal.
For applications that require true high fidelity, audio RF links designed expressly
for this purpose may prove to be a more appropriate solution; however, a
compandor may also be used with the ES Series transmitter to provide further
SNR improvements.
The 360mV P-P output level of the AUDIO line is not sufficient to drive a speaker,
so an amplifier will be required. This amplifier can also be used to provide the
buffering and filtering described above. Some manufacturers make amplifiers
specifically for audio applications, but standard filter designs, such as
Butterworth or Sallen-Key, can also be used with success.
To avoid audible white noise or hiss when no transmission is present, a squelch
circuit can be implemented to provide muting. This is easily accomplished with a
circuit like the one shown below.
VCC
3 9 k
5k
POT
–
LM3 9 3
10k
RSSI
3 9 k
2M
0.01uF
+
10-20k
AUDIO REF
GND
GND
GND
Figure 10: ES Series Receiver Squelch Circuit
Analog squelching is implemented by comparing the RSSI voltage to a voltage
reference (typically a voltage divider) with an open collector-style comparator.
When the RSSI voltage becomes lower than the voltage reference, the
comparator output is pulled to ground, disabling the AUDIO output. This is useful
because the analog circuit can be disabled either when the receiver is out of
range or the transmitter is turned off. Of course it is the designer’s responsibility
to choose a squelch topology that best fits the specific needs of the product.
Page 8
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