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MX641P Datasheet(PDF) 1 Page - CML Microcircuits

Part # MX641P
Description  Dual SPM Detector
Download  17 Pages
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Manufacturer  CMLMICRO [CML Microcircuits]
Direct Link  http://www.cmlmicro.com
Logo CMLMICRO - CML Microcircuits

MX641P Datasheet(HTML) 1 Page - CML Microcircuits

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COMMUNICATION SEMICONDUCTORS
MX641
DATA BULLETIN
Dual SPM Detector
ã
ã
ã
ã2001 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480115.004
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
PRELIMINARY INFORMATION
Features
Applications
• Two (12kHz / 16kHz) SPM Detectors on a
Single Chip
• Detects 12 or 16kHz SPM Frequencies
• ‘Controlled’ (µµµµC) & ‘Fixed’ Signal Sensitivity
Modes
• Selectable Tone Follower or Packet Mode
Outputs
• High Speech-Band Rejection Properties
• ‘Output Enable’ Multiplexing Facility
• Call Charge Applications on PABX Line Cards
• Remote Telephone Applications
+
-
Ch 2
BANDPASS
FILTER
Ch 2
INPUT
AMPLIFIER
CHANNEL 2
CHANNEL 1
Ch2AMP OUT
Ch2 AMP IN (-)
Ch2 AMP IN (+)
Ch 2
OUTPUT
Ch 2
COMPARATOR
PULSE
GENERATOR
AND
DIVIDER
PULSE
MEASUREMENT
LOGIC
PULSE
LENGTH
LOGIC
OUTPUT
SELECT
CIRCUITS
Ch 1
BANDPASS
FILTER
XTAL/CLOCK
GENERATOR
XTAL/CLOCK
CLOCK OUT
CLOCK IN
VDD
VBIAS
VSS
BUFFER
CLOCK
DIVIDERS
LEVEL/
SYSTEM
SETTING
SERIAL
INPUT
LOGIC
SERIAL
DATA
SERIAL
CLOCK
PRESET LEVEL
SYSTEM SELECT
Ch 1
INPUT
AMPLIFIER
12kHz/16kHz
SYSTEM
12kHz/16kHz
SYSTEM
12kHz/16kHz
SYSTEM
TONE FOLLOWER
MODE
TONE FOLLOWER
MODE
PACKET
MODE
PACKET
MODE
INTERNAL
CLOCKS
INTERNAL
COMPARATOR
THRESHOLD
INTERNAL
COMPARATOR
THRESHOLD
GAIN
ADJUST
GAIN
ADJUST
Ch1AMP OUT
Ch1 AMP IN (-)
Ch1 AMP IN (+)
Ch 1
OUTPUT
OUTPUT
SELECT
Ch 1
COMPARATOR
PULSE
GENERATOR
AND
DIVIDER
PULSE
MEASUREMENT
LOGIC
PULSE
LENGTH
LOGIC
OUTPUT
SELECT
CIRCUITS
XTAL
OUTPUT
ENABLE
CHIP SELECT
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
µProcessor 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-
µProcessor 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)


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