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

4.1.8 Output Select Circuits

These drive the output logic pins ‘Channel 1 Output’ and ‘Channel 2 Output’. These outputs can be made high

impedance by setting the OP ENABLEN pin high. When enabled, the format at these pins is either Tone

Follower or Packet. (See Table 9). A high (logic ‘1’) indicates the tone is absent, a low (logic ‘0’) indicates the

tone is present.

4.2 Operating States

There are two operating states for the CMX641A: Fixed Bandwidth and Enhanced Features.

4.2.1 Fixed Bandwidth Operating State (ENHANCED FEATURES pin = logic ‘0’ or open circuit)

In this operating state, the CMX641A is function and pin compatible with the FX641 and MX641. It is a dual-

channel SPM detector with both detectors set to the same level sensitivity and system frequency (12kHz or

16kHz) via a 6-bit serial data word from a host µController. Alternatively, for non µController systems, the

sensitivity and system frequency can be set via external components and logic inputs. In this state, the

decode bandwidth of both channels is internally fixed at ±1.5% of the nominal center frequency.

4.2.1.1 Fixed Bandwidth Operating State (ENHANCED FEATURES pin = logic ‘0’ or Open Circuit)

This state is selected by leaving pin 23 open circuit. In this state, the CMX641 has full pin, function and

software compatibility with the FX641 and MX641. There are two operating modes: Controlled and Fixed

Sensitivity.

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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