MX641 Datasheet, PDF (1/17 Pages) CML Microcircuits – Dual SPM Detector

COMMUNICATION SEMICONDUCTORS
DATA BULLETIN
MX641
Dual SPM Detector
PRELIMINARY INFORMATION
Features
• Two (12kHz / 16kHz) SPM Detectors on a
Single Chip
• Detects 12 or 16kHz SPM Frequencies
• ‘Controlled’ (µC) & ‘Fixed’ Signal Sensitivity
Modes
• Selectable Tone Follower or Packet Mode
Outputs
• High Speech-Band Rejection Properties
• ‘Output Enable’ Multiplexing Facility
Applications
• Call Charge Applications on PABX Line Cards
• 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
V_DD
V_BIAS
V_SS
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 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)
ã2001 MX-COM, Inc.
www.mxcom.com tel: [phone] 744 5050 fax: [phone]
Doc. # 20480115.004
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.