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Features
- Detects 12kHz and 16kHz SPM Frequencies
- Low Power (3.0 Volt 1.0mA) Operation
- High Speechband Rejection Properties
- Tone-Follower and Packet Mode Outputs
- Complex and/or Simple Telephone Systems
- Call-Charge/ Logging Systems
Applications
- Payphones
- FeaturePhones
- PBX Line Cards
Package Styles:
- FX631DW - FX631D5 - FX631P
Supply Requirement:
3.0V to 5.5V power supply
Description
The FX631 is a low-power, system-selectable Subscriber Pulse Metering (SPM) detector to indicate the presence, on a telephone line, of both 12kHz and 16kHz telephone call-charge frequencies.
Deriving its input directly from the telephone line, input amplitude/ sensitivities are component adjustable to the users national 'Must/ Must-Not Decode' specifications via an on-chip input amplifier, whilst the 12kHz and 16kHz frequency limits are accurately defined by the use of an external 3.579545MHz telephone-system Xtal or clock-pulse input.
The FX631, which demonstrates high 12kHz and 16kHz performance in the presence of both voice and noise, can operate from either a single or differential analogue signal input from which it will produce two individual logic outputs.
1. Tone Follower Output - A 'tone-following' logic output producing a 'Low' level for the period of a correct decode and a 'High' level for a bad decode or NOTONE.
2. Packet (Cumulative Tone) Mode Output - To respond and de-respond after a cumulative 40ms of good tone (or NOTONE) in any 48ms period. This process will ignore small fluctuations or fades of a valid frequency input and is available for Processor 'Wake-Up', Minimum tone detection, NOTONE indication or transient avoidance.
This system (12kHz/ 16kHz) selectable microcircuit, which may be line powered, is available in 16-pin plastic DIL and surface mount SOIC and 24-pin plastic SSOP packages.
The FX631 is a low-power, system-selectable Subscriber Pulse Metering (SPM) detector to indicate the presence, on a telephone line, of both 12kHz and 16kHz telephone call-charge frequencies.
Deriving its input directly from the telephone line, input amplitude/ sensitivities are component adjustable to the users national 'Must/ Must-Not Decode' specifications via an on-chip input amplifier, whilst the 12kHz and 16kHz frequency limits are accurately defined by the use of an external 3.579545MHz telephone-system Xtal or clock-pulse input.
The FX631, which demonstrates high 12kHz and 16kHz performance in the presence of both voice and noise, can operate from either a single or differential analogue signal input from which it will produce two individual logic outputs.
1. Tone Follower Output - A 'tone-following' logic output producing a 'Low' level for the period of a correct decode and a 'High' level for a bad decode or NOTONE.
2. Packet (Cumulative Tone) Mode Output - To respond and de-respond after a cumulative 40ms of good tone (or NOTONE) in any 48ms period. This process will ignore small fluctuations or fades of a valid frequency input and is available for Processor 'Wake-Up', Minimum tone detection, NOTONE indication or transient avoidance.
This system (12kHz/ 16kHz) selectable microcircuit, which may be line powered, is available in 16-pin plastic DIL and surface mount SOIC and 24-pin plastic SSOP packages.
