Audio Processor
5
MX806A
Pin
18
19
20
21
Signal
Sum In
Sum Out
Modulation In
Audio Output
Description
The input and output terminals of the on-chip Modulation Summing Amplifier.
External components are required for input signals and gain/attenuation setting as
shown in Figure 2. For single-signal, no gain requirements, Main Process Out
may be linked directly to Modulation In.
The final, composite modulating signal to VCO (Mod 1) and Reference (Mod 2)
Output Drives
The processed audio signal output intended as a received audio (volume) output.
Though normally used in the RX mode, operation in TX is permitted. The output
level of this attenuator is controlled via a Volume Set command. During
Powersave this output is placed at V
SS
.
The drive to the radio modulator Voltage Controlled Oscillator (VCO) from the
composite audio summing stage.
The drive to the radio modulator Reference Oscillator from the composite audio
summing stage.
Note: These VCO output attenuators are individually adjustable using the
Modulator Level command. During Powersave these outputs are placed at V
SS
.
Positive Supply. A single 5.0V regulated supply is required. Levels and voltages
within this Audio Processor are dependent upon this supply.
Table 1: Signal List
22
23
Modulation 1 Drive
Modulation 2 Drive
24
V
DD
1998
MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480064.006
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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CMLMICRO [ CML MICROCIRCUITS ]
