CMX625D5 CML Microcircuits, CMX625D5 Datasheet - Page 23

• Manufacturer Part Number: CMX625D5
• Description: ISDN TA POTS Interface
• Manufacturer: CML Microcircuits

ISDN TA POTS Interface
1.6
1.6.1
2000 Consumer Microcircuits Limited
Application Notes
When using the Tone/FSK bit (bit 6) of the MODE Register, each tone starts from V
returns to 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
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.
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%)
(Hz)
16.7
Off
20
25
35
40
50
BIAS
before ending:
Figure 10 Tone Starting and Stopping
Field 0
(Hex)
$00
$01
$02
$03
$04
$05
$06
Figure 11 Tone Changing
23
BIAS
.
BIAS
CMX625
D/625/1
,
and