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COMMUNICATION SEMICONDUCTORS

MX641

Dual SPM Detector

PRELIMINARY INFORMATION

DATA BULLETIN

Features

鈥?/div>

Two (12kHz / 16kHz) SPM Detectors on a

Single Chip

鈥?/div>

Detects 12 or 16kHz SPM Frequencies

鈥?/div>

鈥楥ontrolled鈥?(碌C) & 鈥楩ixed鈥?Signal Sensitivity

碌

Modes

鈥?/div>

Selectable Tone Follower or Packet Mode

Outputs

鈥?/div>

High Speech-Band Rejection Properties

鈥?/div>

鈥極utput Enable鈥?Multiplexing Facility

CLOCK OUT

XTAL/CLOCK

GENERATOR

XTAL

BUFFER

Applications

鈥?/div>

Call Charge Applications on PABX Line Cards

鈥?/div>

Remote Telephone Applications

CLOCK IN

CLOCK

DIVIDERS

INTERNAL

CLOCKS

V

DD

V

BIAS

V

SS

12kHz/16kHz

SYSTEM

Ch 1 AMP OUT

Ch1 AMP IN (-)

Ch 1

COMPARATOR

TONE FOLLOWER

MODE

Ch 1

OUTPUT

SELECT

CIRCUITS

Ch1 AMP IN (+)

Ch 1

INPUT

AMPLIFIER

GAIN

ADJUST

INTERNAL

COMPARATOR

THRESHOLD

PRESET LEVEL

CHIP SELECT

SERIAL

DATA

12kHz/16kHz

SYSTEM

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

Ch2 AMP IN (+)

Ch 2 AMP OUT

Ch 2

COMPARATOR

TONE FOLLOWER

MODE

The MX641 is a low-power, system-selectable Dual Subscriber Pulse Metering (SPM) Detector designed to

indicate the presence, on a telephone line, of either 12kHz or 16kHz telephone call-charge frequencies. It is

designed for PBX and PABX line-card and remote telephone installations. Under

碌Processor

control via a

common serial interface, each channel of the MX641 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 MX641 adheres accurately to most national 鈥淢ust

and Must-Not鈥?decode band-edges and threshold levels. For non-碌Processor systems a preset

sensitivity/system input allows external channel level and system setting

The digital output is pin-selectable to one of three modes:

(1) Tone Follower mode: 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 fixed (intrinsic

hardwired period that is not user controlled) period.

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

The MX641 requires a 5V supply and is available in the following packages: 24-pin SOIC (MX641DW) and

24-pin PDIP (MX641P)

茫

2001 MX-COM, Inc.

www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA

+

-

Ch 1

BANDPASS

FILTER

PULSE

GENERATOR

AND

DIVIDER

-

+

-

PULSE

MEASUREMENT

LOGIC

PULSE

LENGTH

LOGIC

PACKET

MODE

CHANNEL 1

OUTPUT

ENABLE

12kHz/16kHz

SYSTEM

OUTPUT

SELECT

CHANNEL 2

PULSE

GENERATOR

AND

DIVIDER

PACKET

MODE

PULSE

MEASUREMENT

LOGIC

PULSE

LENGTH

LOGIC

OUTPUT

SELECT

CIRCUITS

Ch 2

OUTPUT

Doc. # 20480115.004

All trademarks and service marks are held by their respective companies.

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