CMX838 View Datasheet(PDF) - CML Microsystems Plc
Part Name
Description
MFG CO.
'CMX838' PDF : 71 Pages View PDF
FRS/PMR446/GMRS Family Radio Processor
CMX838
Examples of ‘single point modulation level’, ‘two point modulation level’ and ‘single point modulation with
varied subaudio level’ paths are illustrated in Figure 36, Figure 37, and Figure 38.
audio
signal
+
subaudio
signal
Vbias
Vbias
0°/180°
phase
0°/180°
phase
TXMOD1 21
TXMOD2 20
Figure 36: Example Single Point Modulation Level Path
audio
signal
+
subaudio
signal
Vbias
Vbias
0°/180°
phase
0°/180°
phase
TXMOD1 21
to VCO input
TXMOD2 20
to VCTCXO input
Figure 37: Example Two-Point Modulation Level Paths
audio
signal
+
subaudio signal with level,
adjusted in Tone Signaling
Processor via uC control to
compensate for FM modulator
subaudio frequency response
characteristics
Vbias
Vbias
0°/180°
phase
0°/180°
phase
TXMOD1 21
to VCO input
TXMOD2 20
Figure 38: Example Single Point Modulation with Varied Subaudio Level Paths
2003 CML Microsystems Plc
53
D/838/8
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