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CMX631A

Low Voltage SPM Detector

CML Microcircuits 

Low Voltage SPM Detector

CMX631A

4 General Description

4.1 Tone Follower Mode

The Tone Follower Output produces a logic ‘0’ when a valid signal is detected. A logic ‘1’ signifies a NOTONE

or bad decode. See Figure 3.

4.2 Packet Mode

The Packet (Cumulative Tone) Mode Output will respond and/or de-respond after a cumulative 40ms of good

tone (or NOTONE) in any 48ms period by providing a Logic level output. See Figure 3.

This process will ignore small fluctuations or fades of a valid frequency input and is available for µProcessor

‘wake-up’, Minimum tone detection, NOTONE indication or transient avoidance.

SIGNAL INPUT

TONE

NOTONE

TONE FOLLOWER OUTPUT

PACKET MODE OUTPUT

RESPONSE

DELAY

SIGNAL INPUT ......

TONE FOLLOWER OUTPUT ......

PACKET MODE OUTPUT ......

DERESPONSE

DELAY

Figure 3: Tone Follower and Packet Mode Outputs

© 1998 Consumer Microcircuits Limited

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D/631A/1

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