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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

5.3 Channel 1 and Channel 2 Output Format

Figure 5 illustrates the two output formats: Tone Follower mode and Packet mode.

SIGNAL INPUT

TONE

NOTONE

CH1 and CH2 OUTPUTS

TONE FOLLOWER OUTPUT

PACKET MODE OUTPUT

SIGNAL INPUT ......

RESPONSE

DELAY

TONE FOLLOWER OUTPUT ......

PACKET MODE OUTPUT ......

DERESPONSE

DELAY

Figure 5: Tone Follower and Packet Mode Outputs

5.4 Setting Level Sensitivity via the Input Serial Data Word

The serial data word input is used to set the device sensitivity in the Controlled Sensitivity mode of the Fixed

Bandwidth Operating state and in the Enhanced Features Operating state.

In Controlled Sensitivity mode of the Fixed Bandwidth Operating state, the CMX641A operates identically to

the FX641 and MX641. The input word is 6 bits and Table 3 lists the device sensitivities vs input codes.

In the Enhanced Features Operating State, channel 1’s sensitivity is controlled by applying the codes in Table

3 to bits D15-D11. Channel 2’s sensitivity is controlled by applying these codes to bits D8-D4.

Example: Suppose the CMX641A is required to work in a system in which 16kHz signals, at or above –

22dB(ref) must be detected and signals at or below –27dB(ref) must not be detected. Reference to Table 3

shows that bandpass filter gain settings of 6dB or 7dB will meet this level specification.

Thus in Fixed Bandwidth Operating State and Controlled Sensitivity Mode:

Inputting D5-D0 = ’001100’ or ‘001110’ (See Table 3) will set both channels to meet this specification.

Selecting ‘001100’ makes both channels’ minimum ‘Will Detect’ level –22.9dB(ref) and its maximum ‘Will Not

Detect’ level –25.5dB(ref). This means that the detection threshold of any device will lie between these two

levels.

In Enhanced Features Operating State Channel 2:

Inputting D15-D11 = ‘00110’ or ‘00111’ (See Table 3 and Table 4) and D1-D0 = ‘00’ (See Table 7) will program

channel 2 to meet this level specification. Selecting ‘00111’ makes the channel 2 minimum ‘Will Detect’ level

–23.9dB(ref) and its maximum ‘Will Not Detect’ level –26.5dB(ref). This means that Channel 2’s detection

threshold will lie between these two levels.

In Enhanced Features Operating State Channel 1:

Inputting D8-D4 = ‘00110’ or ‘00111’ (See Table 3 and Table 4) and D1-D0 = ‘00’, ‘01’ or ‘10’ (See Table 7) will

program channel 1 to meet this level specification. Selecting ‘00110’ makes the CMX641A minimum ‘Will

Detect’ level –22.9dB(ref) and its maximum ‘Will Not Detect’ level –25.5dB(ref). This means that channel 1’s

detection threshold will lie between these two levels. The two channels may be set to identical detection

thresholds, if desired.

ã2001 MX-COM, Inc.

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

Doc. # 20480227.002

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

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