CMX615 Просмотр технического описания (PDF) - MX-COM Inc

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CMX615

Digital Line to POTS Interface

MX-COM Inc  

Digital Line to POTS Interface

CMX615

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 5 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 V . BIAS

Figure 6 Tone Changing

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.

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%)

(Hz)

Off

16.7

20

25

35

40

50

Field 0

(Hex)

$00

$01

$02

$03

$04

$05

$06

© 1999 Consumer Microcircuits Limited

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