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Número de pieza

componentes Descripción

Fabricante

FX806A

AUDIO PROCESSOR

CML Microsystems Plc 

Pin Number Function

FX806A

J/LG/LS

13

Mic Out: The output of the microphone Op-Amp, used with the Mic In (–) input to provide the required

gain/attenuation using external components as shown in Figure 2. The external components shown are

to assist in the use of this amplifier with either inverting or non-inverting inputs. During Powersave

(Volume Command) this output is placed at V .

SS

14

Processed Audio In: The input to the device from such external audio processes as Voice Store and

Retrieve or Frequency Domain Scrambling. This input, which requires to be a.c. coupled with a

capacitor, C , is selected by a Mode Command bit.

13

15

External Audio Process: The buffered output of the Input Processing stage. For further external

audio processing prior to re-introduction at the Processed Audio In pin.

16

CALibration Input: A unique input, intended to be used for dynamic balancing of the modulator drives

and for measuring Deviation Limiter levels. A CUE (beep) input from the FX803 Audio Tone Processor

can be entered on this line. This input is selected via a Mode Command bit (11H) and is self-biased.

17

Main Process Out: The output of the Main Process stage. This output is summed with additional

system inputs as required (Audio, Sub-Audio Signalling, FFSK – See System Overview) in the on-chip

Modulation Summing Amplifier. External components as shown in Figure 2 should be used as required.

18

Sum In:

The input and output terminals of the on-chip Modulation Summing Amplifier. External components

are required for input signals, with gain/attenuation setting as shown in Figure 2. For single-signal,

no-gain requirements, Main Process Out may be linked directly to Modulation In.

19

Sum Out:

20

Modulation In: The final, composite modulating signal to VCO (Mod 1) and Reference (Mod 2) Output

Drives.

21

Audio Output: 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 VSS.

22

Modulation 1 Drive: The drive to the radio modulator Voltage Controlled Oscillator (VCO), from the

composite audio summing stage.

23

Modulation 2 Drive: 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 Levels command.

During Powersave these outputs are placed at VSS.

24

V : Positive supply rail. A single, stable +5 volt supply is required. Levels and voltages within the

DD

Audio Processor are dependant upon this supply.

3

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