CMX615D4 CML Microcircuits, CMX615D4 Datasheet - Page 14

• Manufacturer Part Number: CMX615D4
• Description: Digital Line to POTS Interface
• Manufacturer: CML Microcircuits

Digital Line to POTS Interface
1.6
1.6.1
1999 Consumer Microcircuits Limited
Application Notes
When using the Tone/FSK bit (bit 6) of the MODE Register, each tone starts from V
V
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 V
TX TONES Register decodes which do not have a frequency allocated are indicated by a dash (-) in
the Tone Field tables. These values should not be used.
‘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
BIAS
(f +-2.5%)
before ending:
(Hz)
16.7
Off
20
25
35
40
50
Figure 5 Tone Starting and Stopping
Field 0
(Hex)
$00
$01
$02
$03
$04
$05
$06
Figure 6 Tone Changing
14
BIAS
.
BIAS,
and returns to
CMX615
D/615/4