FX641P4 Datasheet

IC型號(hào)：
FX641P4
PDF描述：
Dual Subscriber Private Metering (SPM) Detector
文件大小：
130.45KB
PDF頁(yè)數(shù)：
13頁(yè)
芯片廠家：
CMLMICRO

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CML Semiconductor Products

PRODUCT INFORMATION

FX641

Features

Two (12kHz/16kHz) SPM

Detectors on a Single Chip

Detects 12kHz and 16kHz SPM

Frequencies

Dual Subscriber Private

Metering (SPM) Detector

Publication D/641/4 February 2001

Provisional Issue

Selectable Tone Follower or

Packet Mode Outputs

High Speech-Band Rejection

Properties

鈥淥utput Enable鈥?Multiplexing

Facility

Call-Charge Applications on

PABX Line Cards

CLOCK IN

CLOCK

DIVIDERS

BIAS

INTERNAL

CLOCKS

Xtal Accuracy; Stable Frequency

Limits

鈥淐ontrolled鈥?(碌C) and 鈥淔ixed鈥?/div>

Signal Sensitivity Modes

CLOCK OUT

XTAL/CLOCK

GENERATOR

XTAL

BUFFER

12kHz/16kHz

SYSTEM

Ch 1

COMPARATOR

TONE FOLLOWER

MODE

Ch 1 AMP OUT

Ch1 AMP IN (-)

Ch 1

OUTPUT

Ch1 AMP IN (+)

Ch 1

INPUT

AMPLIFIER

GAIN

ADJUST

INTERNAL

COMPARATOR

THRESHOLD

PRESET LEVEL

CHIP SELECT

SERIAL

DATA

SERIAL

INPUT

LOGIC

LEVEL/

SYSTEM

SETTING

SERIAL

CLOCK

SYSTEM SELECT

Ch 2

INPUT

AMPLIFIER

GAIN

ADJUST

INTERNAL

COMPARATOR

THRESHOLD

Ch2 AMP IN (-)

Ch 2

BANDPASS

FILTER

Ch 2

COMPARATOR

Ch2 AMP IN (+)

Ch 2 AMP OUT

TONE FOLLOWER

MODE

Fig.1 Functional Block Diagram

Brief Description

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

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.

Under 碌Processor control via a common serial

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.

A common set of external components and a stable

3.579545MHz Xtal/clock input ensures that the FX641

adheres accurately to most national 鈥淢ust and Must-

Not鈥?decode band-edges and threshold levels.

The digital output is pin-selectable to one of three

modes:

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

a correct decode.

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

cumulative period of tone or notone in a preset

period.

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

For non-碌Processor systems a preset sensitivity/system

input allows external channel level and system setting.

This device, which is suitable for PBX and PABX

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.

12kHz/16kHz

SYSTEM

Ch 1

BANDPASS

FILTER

PULSE

GENERATOR

AND

DIVIDER

PULSE

MEASUREMENT

LOGIC

PULSE

LENGTH

LOGIC

PACKET

MODE

OUTPUT

SELECT

CIRCUITS

CHANNEL 1

OUTPUT

ENABLE

12kHz/16kHz

SYSTEM

FX641

OUTPUT

SELECT

CHANNEL 2

PULSE

GENERATOR

AND

DIVIDER

PACKET

MODE

PULSE

MEASUREMENT

LOGIC

PULSE

LENGTH

LOGIC

OUTPUT

SELECT

CIRCUITS

Ch 2

OUTPUT

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