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CMX641A

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CMX641A Advance Information

4.2.2.1.2 Will Detect and Will Not Detect Bandwidths

There are four individually programmable bandwidths per channel. The ‘will detect’ bandwidth can be

programmed to ±1.5%, ±3%, ±5% or ±7%. The corresponding ‘will not detect’ band edges are ±4%, ±5.5%,

±7.5% and ±10%. Bits D10 and D9 control channel 2 and bits D3 and D2 control channel 1.

D10-D9 (Channel 2)

D3-D2 (Channel 1)

00

01

10

11

Lower

Will Not Detect

11.52kHz (-4%)

11.34kHz (-5.5%)

11.10kHz (-7.5%)

10.80kHz (-10.0%)

Lower

Will Detect

11.82kHz (-1.5%)

11.64kHz (-3.0%)

11.40kHz (-5.0%)

11.10kHz (-7.5%)

Upper

Will Detect

12.18kHz (+1.5%)

12.36kHz (+3.0%)

12.60kHz (+5.0%)

12.90kHz (+7.5%)

Upper

Will Not Detect

12.48kHz (+4%)

12.66kHz (+5.5%)

12.90kHz (+7.5%)

13.20kHz (+10.0%)

Table 5: Setting 12kHz Will Detect/Will Not Detect Bandwidths in Enhanced Features Operating State

D10-D9 (Channel 2)

D3-D2 (Channel 1)

00

01

10

11

Lower

Will Not Detect

15.36kHz (-4.0%)

15.12kHz (-5.5%)

14.80kHz (-7.5%)

14.40kHz (-10.0%)

Lower

Will Detect

15.76kHz (-1.5%)

15.52kHz (-3.0%)

15.20kHz (-5.0%)

14.80kHz (-7.5%)

Upper

Will Detect

16.24kHz (+1.5%)

16.48kHz (+3.0%)

16.80kHz (+5.0%)

17.20kHz (+7.5%)

Upper

Will Not Detect

16.64kHz (+4.0%)

16.88kHz (+5.5%)

17.20kHz (+7.5%)

17.60kHz (+10.0%)

Table 6: Setting 16kHz Will Detect/Will Not Detect Bandwidths in Enhanced Features Operating State

The CMX641A will always respond to valid inputs between the Lower ‘Will Detect’ and Upper ‘Will Detect’

frequencies inclusive. It will not respond to frequencies at or below the Lower ‘Will Not Detect’ or at or above

the Upper ‘Will Not Detect’. The response and deresponse times will depend upon the output format chosen,

i.e. Tone Follower or Packet output.

4.2.2.1.3 System Select

Bits D1 and D0 select the operating frequencies of the CMX641A in Enhanced Features Operating State.

D1-D0

00

01

10

11

Channel 1 Output

Detects 16kHz

Detects 16kHz

Detects 16kHz

Detects 12kHz

Channel 2 Output

Detects 16kHz

Detects 12kHz

Detects 12kHz

Detects 12kHz

Amp 1

Input to channel 1

Input to channel 1

Input to channel

1&2

Input to channel 1

Amp 2

Input to channel 2

Input to channel 2

Available as

independent

amplifier

Input to channel 2

Table 7: Setting System Frequencies in Enhanced Features Operating State

The operating frequencies can be set in four ways as shown in Table 7. In three of the four cases, Amplifier 1

is the input to channel 1 and Amplifier 2 is the input to channel 2. However, when bits D1-D0=10, both

channels take their input from Amplifier 1. This makes Amplifier 2 available for independent use, perhaps as

a gain or filter block.

However it should be noted that each channel will detect its system frequency only in the absence of the other.

The device is not designed to be immune to the presence of the other tone. Each channel will function

correctly when either 12kHz or 16kHz, but not both, is present.

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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