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CMX625 Scheda tecnica(PDF) 23 Page - CML Microcircuits

Il numero della parte CMX625
Spiegazioni elettronici  ISDN TA POTS Interface
PDF  34 Pages
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Produttore elettronici  CMLMICRO [CML Microcircuits]
Homepage  http://www.cmlmicro.com
Logo CMLMICRO - CML Microcircuits

CMX625 Scheda tecnica(HTML) 23 Page - CML Microcircuits

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ISDN TA POTS Interface
CMX625
 2001 Consumer Microcircuits Limited
23
D/625/2
1.6
Application Notes
When using the Tone/FSK bit (bit 6) of the MODE Register, each tone starts from VBIAS, and
returns to VBIAS before ending:
Figure 10 Tone Starting and Stopping
When switching between tones in the same column (bits 4 - 7 or bits 0 - 3) of the TX TONES
Register), the transition will be phase continuous. However, switching to the ‘OFF’ state will
immediately take the output of that tone generator to VBIAS.
Figure 11 Tone Changing
The TX TONES Register which does not have a frequency allocated is indicated by ‘-’ in the Tone
Field tables. These values should not be used.
1.6.1
Telecom Tones
The following tables give the hex codes to be programmed into the particular tone field location for
various telecommunications systems applications. The tables are not exhaustive, but list the more
commonly used tones.
Ringing Signals
(f ±2.5%)
Field 0
(Hz)
(Hex)
Off
$00
16.7
$01
20
$02
25
$03
35
$04
40
$05
50
$06



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