Features: ·Detects 12kHz and 16kHz SPM Frequencies·Low Power wer (3.0 Volt olt MIN <1.0mA) Operation·High Speec Speechband hband RejectionProperties·Tone-one-Follo Follower wer and P Pac ac acket ket Mode OutputsApplication·Comple Complex x and/or Simple Telephone elephone Systems·Call-Char Cha...
FX631: Features: ·Detects 12kHz and 16kHz SPM Frequencies·Low Power wer (3.0 Volt olt MIN <1.0mA) Operation·High Speec Speechband hband RejectionProperties·Tone-one-Follo Follower wer and P Pac ac acket...
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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 FX631's input directly from the telephone line,input amplitude/sensitivities are component adjustable to the user's 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.