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MX641P Datasheet(PDF) 1 Page - CML Microcircuits |
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MX641P Datasheet(HTML) 1 Page - CML Microcircuits |
1 / 17 page 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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