FX651 데이터 시트보기 (PDF) - CML Microsystems Plc

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FX651

SPM and Security Subsystem

CML Microsystems Plc 

CML Semiconductor Products

SPM and Security Subsystem FX651

1.0 Features

• Two Integrated Telecoms

Functions:

• 12kHz SPM Detector

• Half Duplex 18kHz Modem

• Compact 16-pin Small Outline

(SOIC) Package

• Card Operated Telephone

Installations

D/651/4 September 1997

Provisional Information

• Low Power (3.3V) Requirement

• Component Adjustable Input

Sensitivity

• Meets European 12kHz SPM

Frequency Specifications

• Worldwide Pay-Phone

Applications

VBIAS

1.1 Brief Description

The FX651 integrated circuit combines 12kHz Subscriber Private Metering (SPM) detection with 18kHz

tone processing for anti-fraud purposes within a telephone system. This compact, low power device is

suitable for battery or line powered systems. Under simple logic or µProcessor control it will:

Decode 12kHz SPM pulses in the presence of high level voice and 18kHz signalling, and

provide a logic output.

Transmit an NRZ modulated 18kHz security tone to line.

Decode an incoming modulated 18kHz security tone in the presence of high level voice

and 12 kHz SPM tones, and provide a logic output.

Employing high accuracy switched capacitor filters, the FX651 is protected from crosstalk and false

decoding.

© 1997 Consumer Microcircuits Limited

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