CMX641A データシートの表示（PDF） - MX-COM Inc

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CMX641A

Dual SPM/Security Detector/Generator

MX-COM Inc  

Dual SPM/Security Detector/Generator

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CMX641A Advance Information

4.2.2.1.4 ASK Tone Output

This is output from the TONE OP pin under the control of the TONE ASK input and the TX TONE SELECT

pins. The TONE ASK pin keys the transmit tone on-off. A logic high corresponds to no tone and logic low to

tone. The output frequency is selected by the TX TONE SELECT pin. A logic high selects 12kHz and logic

low selects 16kHz. (See Table 8). The tone output is ramped up to its maximum level and down to nil output

with time constants of TBD and TBD respectively.

TONE ASK

0

0

1

TX TONE SELECT

0

1

X

TONE OP

16kHz

12kHz

BIAS

Table 8: Selecting Transmission Tone in Enhanced Features Mode

4.2.3 Features Common to both Operating States

In both states, three output formats are available for the channel output pins. These output formats are

selectable via the logic input pins OP SELECT and OP ENABLEN. (See Table 8).

i. In Tone Follower mode, the logic output has very short response and deresponse times so that it forms

an ‘envelope’ of the input tone. Host systems will decide whether the received signal fulfils the system

tone pulse length requirements.

ii. In Packet mode, the channel output only responds after 40ms of received continuous tone. The

CMX641A then ignores the erroneous 20ms on, 20ms off “ringing” pattern which occurs on some

telephone lines.

iii. The deresponse time is also 40ms, so that the decode output pin forms a delayed envelope of the input

tone and host systems can decide, as in the Tone Follower mode, whether the received tone duration

fulfils local system requirements.

iv. The outputs can be set to a high impedance state for device multiplexing.

OP ENABLEN

0

0

1

OP SELECT

0

1

X

CH1 & CH2

OP FORMAT

Packet Mode

Tone Follower Mode

High Z

Table 9: Selection of Output Format via OP ENABLEN and OP SELECT pins

ã2001 MX-COM, Inc.

www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054

Doc. # 20480227.002

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