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CMX608 Arkusz danych(PDF) 34 Page - CML Microcircuits

Numer części CMX608
Szczegółowy opis  Integrated Input and Output Channel Filters
PDF  70 Pages
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Producent  CMLMICRO [CML Microcircuits]
Strona internetowa  http://www.cmlmicro.com
Logo CMLMICRO - CML Microcircuits

CMX608 Arkusz danych(HTML) 34 Page - CML Microcircuits

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RALCWI Vocoder
CMX608/CMX618/CMX638
 2014 CML Microsystems Plc
34
D/608_18_38/11
AOG register address $06 (CMX618/CMX638 only. No function on CMX608.)
7
6
5
4
3
2
1
0
OUTPUT GAIN SWITCH
0
0
0
OUTPUT GAIN
This is the analogue output gain control register. The output level should be chosen to avoid
unnecessary distortion in the output amplifier. This gain block follows the DAC, which is a sigma-
delta design with a sampling frequency of 2.4MHz and an on-chip reconstruction filter. An external
RC filter could be added across the OUTP and OUTN pins, if clock noise needs further reduction.
Bits 0 to 3
These bits control the output gain stage according to the following table:
OUTPUT
GAIN
Bit 3
Bit 2
Bit 1
Bit 0
Gain (dB)
0
0
0
0
-14 (default)
0
0
0
1
-12
0
0
1
0
-10
0
0
1
1
-8
0
1
0
0
-6
0
1
0
1
-4
0
1
1
0
-2
0
1
1
1
0
1
0
0
0
2
1
0
0
1
4
1
0
1
0
6
1
0
1
1
8
1
1
0
0
10
1
1
0
1
12
1
1
1
0
14
1
1
1
1
16
Bits 4 to 6
These bits are unused and should be cleared to '0'.
Bit 7
A '0' in this bit sets the earpiece gain to 0dB. A '1' in this bit sets the earpiece gain
OUTPUT
to +6dB. A further 6dB of gain can be achieved by using both audio outputs. As
GAIN
these outputs are in anti-phase, connecting the earpiece across them will provide
SWITCH
6dB more gain, as well as saving a dc blocking capacitor. See Figure 7.



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