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CMX148 Datasheet(PDF) 43 Page - CML Microcircuits

Part # CMX148
Description  Programmable Voice Scrambler
PDF  75 Pages
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Manufacturer  CMLMICRO [CML Microcircuits]
Direct Link  http://www.cmlmicro.com
Logo CMLMICRO - CML Microcircuits

CMX148 Datasheet(HTML) 43 Page - CML Microcircuits

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PMR Audio and Data Processor
CMX148
© 2010 CML Microsystems Plc
43
D/148/6
8.1.11.
Analogue Output Gain - $B0 write
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Inv_1
MOD1
Attenuation
Inv_2
MOD2
Attenuation
Ramp
Up/Dn
0
0
0
Audio Output
Attenuation
This register provides attenuation of the MOD1, MOD2 and AUDIO output signals, but no gain. Likewise,
the fine gain adjustment (P4.2-3) only provides signal attenuation. If the signal output is too small, then
the input gain stages (register $B1) will need to be adjusted.
b15
MOD1 output polarity
0 = true
1 = inverted
b11
MOD2 output polarity
0 = true
1 = inverted
Used when interfacing with RF circuitry or when generating an inverted turn-off code for
CTCSS. Any change will take place immediately (within the C-BUS latency period) after these
bits are changed.
b14
b13
b12
MOD1 Output Attenuation
b10
b9
b8
MOD2 Output Attenuation
0
0
0
>40dB (default)
0
0
1
12dB
0
1
0
10dB
0
1
1
8dB
1
0
0
6dB
1
0
1
4dB
1
1
0
2dB
1
1
1
0dB
b7
Ramp Up/Down enable
0 = off
1 = on
When bit 7 is set to 1 the MOD output signals are ramped to reduce transients in the
transmitted signal. The ramp up/down time is set in the ‘Ramp Rate Control’ section of the
Program Block (P4.6).
Bits 6 to 4 are reserved - set to 0.
b3
b2
b1
b0
Audio Output Attenuation
0
0
0
0
>60dB (default)
0
0
0
1
44.8dB
0
0
1
0
41.6dB
0
0
1
1
38.4dB
0
1
0
0
35.2dB
0
1
0
1
32.0dB
0
1
1
0
28.8dB
0
1
1
1
25.6dB
1
0
0
0
22.4dB
1
0
0
1
19.2dB
1
0
1
0
16.0dB
1
0
1
1
12.8dB
1
1
0
0
9.6dB
1
1
0
1
6.4dB
1
1
1
0
3.2dB
1
1
1
1
0dB
Note that fine control of Output1 and Output2 levels can be achieved with the FINE OUTPUT GAIN 1 and
FINE OUTPUT GAIN 2 registers (P4.2-3). These affect the MOD1, MOD2 and AUDIO outputs according
to the routing set in registers $A7 and $B1



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