Details, datasheet, quote on part number: MX641DW
PartMX641DW
CategoryCommunication => Telephony => Codecs/Voice Codecs => PCM Line Card->Signaling & Control
TitlePCM Line Card->Signaling & Control
DescriptionDual SPM Detector
CompanyConsumer Microcircuits Limited
DatasheetDownload MX641DW datasheet
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Features, Applications

Features

Two / 16kHz) SPM Detectors on a Single Chip Detects or 16kHz SPM Frequencies `Controlled' (ÁC) & `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
PRESET LEVEL CHIP SELECT SERIAL DATA
Ch 2 INPUT AMPLIFIER GAIN ADJUST INTERNAL COMPARATOR THRESHOLD

The is a low-power, system-selectable Dual Subscriber Pulse Metering (SPM) Detector designed to indicate the presence, on a telephone line, of either or 16kHz telephone call-charge frequencies. It is designed for PBX and PABX line-card and remote telephone installations. Under ÁProcessor 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-ÁProcessor 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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1. Block Diagram............................................................................................................... 3 2. Signal List...................................................................................................................... 4 3. External Components................................................................................................... 6 4. General Description...................................................................................................... 7

4.2 4.3 Xtal/Clock Distribution........................................................................................................ 7 Channel Outputs................................................................................................................ 7 Sensitivity Setting.............................................................................................................. 8

4.3.1 4.3.2 Controlled Sensitivity Setting.................................................................................................. 8 Fixed Sensitivity Setting........................................................................................................ 11

5.1.2 5.1.3 Input Configurations.............................................................................................................. 12 Protection Against High Voltages......................................................................................... 12 Aliasing................................................................................................................................. 12

6.1.2 6.1.3 Absolute Maximum Ratings.................................................................................................. 13 Operating Limits.................................................................................................................... 13 Operating Characteristics..................................................................................................... 13

MXCOM, Inc. reserves the right to change specifications at any time and without notice.
Ch 1 INPUT AMPLIFIER GAIN ADJUST INTERNAL COMPARATOR THRESHOLD
CLOCK OUT XTAL/CLOCK GENERATOR BUFFER CLOCK DIVIDERS
CHIP SELECT SERIAL INPUT LOGIC LEVEL/ SYSTEM SETTING

 

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