CMX885 datasheet(17/69 Pages) CMLMICRO

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Marine VHF Audio and Signalling Processor

CMX885

Formatted mode

DSC Modem

BPF

Data Modem

In-band signalling

DTMF

De-

emphasis

De-

scrambler

Channel

filter

Audio

processing

Receive functions

ALT I/P

Mic I/P

Disc I/P

VBias

HPF

Mux

$C1

b11

HPF

Audio

Routing

$B1

VBias

Input 2

$B1

b15-13

Input 1

$B1

b12-10

Raw mode

Mux

$C1

Mux

$B1

b3,2

Mux

$B1

b5,4

Audio Gain

$B0

b3-0

Data

Modem

Scrambler

Inband

signalling

Programmable tone

DTMF

Audio processing

Transmit functions

Pre-

Emphasis

Channel

filtering

Soft

Limiter

MOD

mode

$A7

b12,13

Mux

$C1

b14-2

Raw mode

DSC Modem

Output 1

Output

Formatted mode

MOD2 gain

$B0

b10-8

MOD1 gain

$B0

b14-11

Mux

$B1

b9,8

Mux

$B1

Output

Mux

$C1

b13

BPF

Modem

NWR

Modem

Figure 5 Signal Routing

The analogue gain/attenuation of each input and output can be set individually, with additional fine gain

control available via the Programming register.

See:

Analogue Output Gain – $B0 write

Input Gain and Output Signal Routing – $B1 write

7.4.2

Mode Control

The CMX885 operates in one of three modes:

Idle

At power-on or following a Reset, the device will automatically enter Idle mode, which allows for the

maximum powersaving whilst still retaining the capability of monitoring the four ADC inputs (if enabled). It

is only possible to write to the Programming register whilst in Idle mode.

See:

Mode Control – $C1 write

CML Microsystems Plc

2010

D/885/3

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