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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

Notes:

1. At 5.0V. Not including any current drawn from the pins by external circuitry.

2. At 3.0V. Not including any current drawn from the pins by external circuitry.

3. Logic pins with no internal pull-up or pull-down resistors; CHIP SELECTN, SERIAL DATA, SERIAL

CLOCK, OP ENABLEN, OP SELECT and CLOCK IN pins.

4. Logic pins with an internal pull-up or pull-down resistor; PRESET LEVEL/TONE ASK, SYSTEM

SELECT/TX TONE SELECT, ENHANCED FEATURES.

5. Tone Follower or Packet Mode enabled.

6. Tristate selected.

7. Time taken to change between any two of the operational modes: Tone follower, Packet or Tristate, and

with a maximum capacitive load of 30pF on an output.

8. With adherence to Signal to Voice and Signal to Noise specifications.

9. 12kHz and/or 16kHz system.

10. The time delay after a valid serial data load (or after device powerup, change of bandwidth setting or

change in input signal conditions), before the condition of the outputs can be guaranteed correct.

11. With ‘Will Detect’ bandwidth set to ±1.5%, Fixed Bandwidth Operating State or Enhanced Features

Operating State.

12. With ‘Will Detect’ bandwidth set to ±3.0%, Enhanced Features Operating State only.

13. With ‘Will Detect’ bandwidth set to ±5.0%, Enhanced Features Operating State only.

14. With ‘Will Detect’ bandwidth set to ±7.5%, Enhanced Features Operating State only.

15. With the input amplifier gain at 0dB and the Bandpass filter gain set to 0dB (Table 3); subtract 1dB from

this specification for each single dB of Bandpass filter gain programmed.

Alternatively, with the input components as recommended in Figure 2, the sensitivity is as defined in Table

3.

16. In Fixed Bandwidth Operating State, Controlled Sensitivity mode; or in Enhanced Features Operating

State.

17. In Fixed Bandwidth Operating State, Preset Sensitivity Mode.

18. With input amplifier gain setting 0dB via external components and measured at amplifier output with

VDD = 5.0V. Signal sensitivity is proportional to VDD.

19. For immunity to false responses and/or deresponses.

20. Common mode SPM and balanced voice signal.

21. With SPM and voice signal balanced; to avoid false deresponses due to saturation, the peak to peak voice

+ noise level at the output of the input amplifier should be no greater than the dynamic range of the

device. For this reason, the signal to voice figure at the Amp output will vary with the sensitivity setting.

The lowest signal to voice figure occurs at the highest sensitivity setting (Table 3, 27dB).

22. Maximum voice frequencies = 3.4kHz.

23. Output tone = 12kHz selected.

24. Output tone = 16kHz selected.

25. The time between a logic ‘1-0’ transition at TONE ASK input and the tone at TONE OP reaching 10% of its

full value or between a ‘0-1’ transition at TONE ASK input and the tone falling to 90% of its full value.

26. The time for the tone at TONE OP to rise from 10% to 90% or to fall from 90% to 10% of its full value.

27. Tx circuit enabled in Enhanced Features Operating State.

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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