FX641D2 Consumer Microcircuits Limited, FX641D2 Datasheet

FX641D2

Manufacturer Part Number

FX641D2

Description

SOP24

Manufacturer

Consumer Microcircuits Limited

Datasheet

1.FX641D2.pdf (13 pages)

Specifications of FX641D2

Date_code

04+

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Features

Brief Description

Subscriber Private Metering (SPM) Detector -two

detectors on a single chip- to indicate the presence,

on a telephone line, of either 12kHz or 16kHz

telephone call-charge frequencies.

interface, each channel of the FX641 will detect

call-charge pulses from a telephone line and provide a

digital output for recording, billing or security

purposes.

3.579545MHz Xtal/clock input ensures that the FX641

adheres accurately to most national “Must and Must-

Not” decode band-edges and threshold levels.

Fig.1 Functional Block Diagram

Under µProcessor control via a common serial

A common set of external components and a stable

The FX641 is a low-power, system-selectable Dual

XTAL/CLOCK

XTAL

Ch 1 AMP OUT

Ch1 AMP IN (-)

Ch1 AMP IN (+)

PRESET LEVEL

CHIP SELECT

SERIAL

SYSTEM SELECT

Ch2 AMP IN (-)

Ch2 AMP IN (+)

Ch 2 AMP OUT

CLOCK

DATA

Two (12kHz/16kHz) SPM

Detectors on a Single Chip

Detects 12kHz and 16kHz SPM

Frequencies

Xtal Accuracy; Stable Frequency

Limits

“Controlled” (µC) and “Fixed”

Signal Sensitivity Modes

AMPLIFIER

SERIAL

INPUT

LOGIC

Ch 1

Ch 2

ADJUST

GAIN

XTAL/CLOCK

GENERATOR

BANDPASS

FILTER

Ch 1

SETTING

Ch 2

SYSTEM

LEVEL/

COMPARATOR

THRESHOLD

INTERNAL

COMPARATOR

CML Semiconductor Products

PRODUCT INFORMATION

FX641

COMPARATOR

Ch 1

Ch 2

BUFFER

12kHz/16kHz

SYSTEM

CLOCK OUT

GENERATOR

CHANNEL 1

CHANNEL 2

DIVIDER

PULSE

AND

MEASUREMENT

Dual Subscriber Private

Metering (SPM) Detector

CLOCK IN

12kHz/16kHz

PULSE

LOGIC

SYSTEM

DIVIDERS

CLOCK

The digital output is pin-selectable to one of three

modes:

For non-µProcessor systems a preset sensitivity/system

input allows external channel level and system setting.

line-card and remote telephone installations, is available

in compact 24-pin plastic DIL and small outline (S.O.I.C.)

packages.

The FX641 requires approximately 4.5mA at 5-volts.

(1) Tone Follower mode -a logic level for the period of

(2) Packet mode -respond/de-respond after a

(3) High-impedance output -for device multiplexing.

This device, which is suitable for PBX and PABX

TONE FOLLOWER

LENGTH

PULSE

LOGIC

PULSE

LOGIC

Selectable Tone Follower or

Packet Mode Outputs

High Speech-Band Rejection

Properties

“Output Enable” Multiplexing

Facility

Call-Charge Applications on

PABX Line Cards

MODE

a correct decode.

cumulative period of tone or notone in a preset

period.

Publication D/641/4 February 2001

Provisional Issue

12kHz/16kHz

INTERNAL

SYSTEM

CLOCKS

PACKET

MODE

CIRCUITS

OUTPUT

SELECT

OUTPUT

ENABLE

OUTPUT

SELECT

Ch 1

Ch 2

BIAS

FX641

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