MX826 Просмотр технического описания (PDF) - Unspecified

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MX826

AMPS/NAMPS SYSTEM AUDIO PROCESSOR

Unspecified 

AMPS/NAMPS System Audio Processor.

Pin Function

MX826 Preliminary Information

12 Ear Audio Out: An audio output of the Rx path (or selected audios), available as an output for a handset

earpiece. This output, in parallel with the LS Audio Out function, can be connected to VBIAS when not

required, by SW7 (Configuration Command (10H)). A driver amplifier may be required.

13 Sidetone: A switched “sidetone” from the microphone inputs made available for mixing externally with

the “Ear” audio. See Figure 3.

14 VSS: Negative supply rail. Signal ground.

15 TX Mix: The output of the TX Mix Amplifier. Used with external components, it allows the TX Filter

Out output to mix with externally generated signalling tones prior to the final level adjustment.

16 SAT Out: The output of the SAT Bandpass filter. This level is recovered from the input RX audio and

is available for mixing externally with the transmitter modulation. See Figure 3.

17 TX Mix In: The input to the TX Mix Amplifier. Used with external components, it allows the TX Filter

Out output to mix with externally generated signalling tones prior to the final level adjustment. The

recovered SAT signal may be introduced at this point. See Figures 2 and 3.

18 TX Filter Out:The output of the Deviation Limiter/Lowpass Filter stage. This stage can be by-passed

using SW3 (Configuration Command). See Figure 3.

19 No internal connection – Leave open circuit.

20 Deviation Limiter In: Input to the on-chip deviation limiter. This input should be a.c. coupled to the

Pre-Emphasis Out pin. The a.c. coupling will achieve maximum possible symmetry of limiting as this

input has a 1MΩ internal resistor to VBIAS. See Figure 2.

21 Pre-Emphasis Out: Audio output from the TX Gain/Pre-Emphasis function. This output should be

a.c. coupled to the Deviation Limiter In pin. See Figures 2 & 3.

22 DTMF In: To introduce DTMF type audio, at a suitable level for transmission, to the TX Path,

controlled by SW2 (Configuration Command (10H)). This input has an internal 1MΩ resistor to VBIAS

and should be connected via a capacitor.

23 Compression In: The audio input from an external compression system. This input has an internal

1MΩ resistor to VBIAS and should be connected via a capacitor.

24 Compression: The output to an external audio compression system. Currently available compressor/

expanders have Op-Amps incorporated. The compressor can be by-passed by SW2.

25 Mic.2 In: TX voice (Mic.) inputs, selectable by SW1 available for handsfree mic./handset mic. or

any TX audio input. Pre-amplification may be required at these inputs. These inputs

26 Mic.1 In: each have an internal 1MΩ resistor to VBIAS and should be connected via a capacitor.

27 Play In: The input via SW2 from a voice storage device such as the MX812. This “replayed” audio

can be sent to RX or TX paths allowing a Messaging/Voice Notepad/Answering facility. This input has

an

internal

1MΩ

resistor

to

V

BIAS

and

should

be

connected

via

a

capacitor.

28 VDD: Positive supply rail. A single +5-volt power supply is required. Levels and voltages within this

Audio Processor are dependent upon this supply.

C-BUS is MX-COM’s proprietary standard for the transmission of commands and data between a

µController and the relevant Cellular microcircuits. It may be used with any µController, and can, if

desired, take advantage of the hardware serial I/O functions embodied into many types ofµController.

The “C-BUS” data rate is determined solely by the µController.

© 1997 MX•COM Inc.

www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054

Doc. # 20480070.004

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

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