MX641DW Ver la hoja de datos (PDF) - MX-COM Inc
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MX641DW Datasheet PDF : 16 Pages
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DATA BULLETIN
MX641 Dual SPM Detector
PRELIMINARY INFORMATION
Features
x Two (12kHz / 16kHz) SPM Detectors on a
Single Chip
x Detects 12 or 16kHz SPM Frequencies
x ‘Controlled’ (PC) & ‘Fixed’ Signal Sensitivity
Modes
x Selectable Tone Follower or Packet Mode
Outputs
x High Speech-Band Rejection Properties
x ‘Output Enable’ Multiplexing Facility
Applications
x Call Charge Applications on PABX Line
Cards
x Remote Telephone Applications
XTAL/CLOCK
XTAL
Ch 1 AMP OUT
Ch1 AMP IN (-) -
+
Ch1 AMP IN (+)
Ch 1
INPUT
AMPLIFIER
PRESET LEVEL
CHIP SELECT
SERIAL
DATA
SERIAL
INPUT
LOGIC
SERIAL
CLOCK
SYSTEM SELECT
Ch2 AMP IN (-)
Ch 2
INPUT
AMPLIFIER
-
+
Ch2 AMP IN (+)
Ch 2 AMP OUT
XTAL/CLOCK
GENERATOR
CLOCK OUT
BUFFER
CLOCK IN
CLOCK
DIVIDERS
INTERNAL
CLOCKS
VDD
VBIAS
VSS
Ch 1
BANDPASS
FILTER
Ch 1
COMPARATOR
-
+
GAIN
ADJUST
INTERNAL
COMPARATOR
THRESHOLD
12kHz/16kHz
SYSTEM
PULSE
GENERATOR
AND
DIVIDER
PULSE
MEASUREMENT
LOGIC
CHANNEL 1
LEVEL/
SYSTEM
SETTING
12kHz/16kHz
SYSTEM
TONE FOLLOWER
MODE
Ch 1
OUTPUT
PULSE
LENGTH
LOGIC
OUTPUT
SELECT
CIRCUITS
PACKET
MODE
OUTPUT
ENABLE
12kHz/16kHz
SYSTEM
OUTPUT
SELECT
GAIN
ADJUST
INTERNAL
COMPARATOR
THRESHOLD
Ch 2
+
BANDPASS
FILTER
-
Ch 2
COMPARATOR
CHANNEL 2
PULSE
GENERATOR
AND
DIVIDER
PULSE
MEASUREMENT
LOGIC
PACKET
MODE
PULSE
LENGTH
LOGIC
OUTPUT
SELECT
CIRCUITS
TONE FOLLOWER
MODE
Ch 2
OUTPUT
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 PProcessor 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 “Must and Must-Not” decode band-edges and threshold levels. For non-
PProcessor 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).
© 1998 MXxCOM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480115.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
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