MX COM Inc MX641DW, MX641P Datasheet

DATA BULLETIN

MX641

Dual SPM Detector

Features Applications

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

XTAL/CLOCK

XTAL

Ch1AMPOUT

Ch1 AMP IN (-)

Ch1 AMP IN (+)

PRESET LEVEL

CHIP SELECT SERIAL

DATA

SERIAL CLOCK

SYSTEM SELECT

Ch2 AM PIN (-)

Ch2 AMP IN (+)

Ch2AMPOUT

Ch 1

INPUT

AMPLIFIER

SERIAL INPUT LOGIC

Ch 2

INPUT

AMPLIFIER

XTAL/CLOCK GENERATOR

Ch 1

BANDPASS

FILTER

GAIN

ADJUST

LEVEL/ SYSTEM SETTING

GAIN

ADJUST

Ch 2

BANDPASS

FILTER

COMPARATOR

THRESHOLD

COMPARATOR

THRESHOLD

CLOCK OUT CLOCK IN

BUFFER

Ch 1

COMPARATOR

INTERNAL

12kHz/16kHz

SYSTEM

INTERNAL

Ch 2

COMPARATOR

x Call Charge Applications on PABX Line

Cards

x Remote Telephone Applications

CLOCK

DIVIDERS

12kHz/16kHz

PULSE

GENERATOR

AND

DIVIDER

CHANNEL 1

CHANNEL 2

PULSE

GENERATOR

AND

DIVIDER

SYSTEM

PULSE

MEASUREMENT

LOGIC

PULSE

MEASUREMENT

LOGIC

TONE FOLLOWER

PULSE

LENGTH

LOGIC

PULSE

LENGTH

LOGIC

TONE FOLLOWER

PRELIMINARY INFORMATION

OUTPUT SELECT

CIRCUITS

OUTPUT SELECT

CIRCUITS

Ch 1

OUTPUT

OUTPUT ENABLE

OUTPUT SELECT

Ch 2

OUTPUT

BIAS

MODE

INTERNAL

CLOCKS

PACKET

MODE

12kHz/16kHz

SYSTEM

PACKET

MODE

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 nonPProcessor 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).

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

xCOM Inc. www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054 Doc. # 20480115.003

Dual SPM Detector 2 MX641 PRELIMINARY INFORMATION

CONTENTS

Section Page

1. Block Diagram.................................................................................................................................. 3

2. Signal List......................................................................................................................................... 4

3. External Components...................................................................................................................... 6

4. General Description......................................................................................................................... 7

4.1 Xtal/Clock Distribution............................................................................................................................... 7

4.2 Channel Outputs....................................................................................................................................... 7

4.3 Sensitivity Setting...................................................................................................................................... 8

4.3.1 Controlled Sensitivity Setting.............................................................................................................................8

4.3.2 Fixed Sensitivity Setting....................................................................................................................................11

5. Applications .................................................................................................................................... 12

5.1.1 Input Configurations..........................................................................................................................................12

5.1.2 Protection Against High Voltages .....................................................................................................................12

5.1.3 Aliasing .............................................................................................................................................................12

6. Performance Specification............................................................................................................. 13

6.1 Electrical Specifications ........................................................................................................................... 13

6.1.1 Absolute Maximum Ratings..............................................................................................................................13

6.1.2 Operating Limits................................................................................................................................................13

6.1.3 Operating Characteristics .................................................................................................................................13

6.2 Timing ...................................................................................................................................................... 15

6.3 Packages ................................................................................................................................................. 16

MXxCOM, Inc. reserves the right to change specifications at any time and without notice.

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

Dual SPM Detector 3 MX641 PRELIMINARY INFORMATION

1. Block Diagram

DDVBIASVSS

CLOCKS

INTERNAL

CLOCK

DIVIDERS

TONE FOLLOWER

SYSTEM

12kHz/16kHz

Ch 1

MODE

OUTPUT

PULSE

MEASUREMENT

PULSE

GENERATOR

SELECT

CIRCUITS

LOGIC

LENGTH

LOGIC

AND

DIVIDER

MODE

PACKET

CHANNEL 1

ENABLE

OUTPUT

SYSTEM

12kHz/16kHz

SELECT

OUTPUT

CHANNEL 2

MODE

PACKET

SELECT

OUTPUT

CIRCUITS

LOGIC

PULSE

LENGTH

LOGIC

PULSE

MEASUREMENT

AND

PULSE

DIVIDER

GENERATOR

Ch 2

OUTPUT

TONE FOLLOWER

MODE

CLOCK OUT CLOCK IN

XTAL/CLOCK

BUFFER

GENERATOR

XTAL

SYSTEM

12kHz/16kHz

Ch 1

COMPARATOR

Ch1AMPOUT

INTERNAL

THRESHOLD

COMPARATOR

LEVEL/

SERIAL

DATA

SERIAL

SYSTEM

SETTING

INPUT

LOGIC

Ch 1

FILTER

BANDPASS

Ch1 AMP IN (-)

GAIN

ADJUST

Ch 1

INPUT

AMPLIFIER

PRESET LEVEL

Ch1 AMP IN (+)

CHIP SELECT

SERIAL

CLOCK

INTERNAL

THRESHOLD

COMPARATOR

GAIN

Ch 2

SYSTEM SELECT

ADJUST

INPUT

AMPLIFIER

Ch 2

Ch2 AMP IN (-)

BANDPASS

FILTER

Ch 2

COMPARATOR

Ch2AMPOUT

Ch2 AMP IN (+)

Figure 1: Block Diagram

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

Dual SPM Detector 4 MX641 PRELIMINARY INFORMATION

2. Signal List

Pin No. Name Type Description

1 Xtal/Clock input The input to the on-chip clock oscillator; for use with a 3.579545MHz Xtal in

conjunction with the Xtal output; circuit components are on-chip. When using a Xtal input, the Clock Out pin should be connected directly to the Clock In pin. If a clock pulse input is used at the Clock In pin, this (Xtal/Clock) pin must be connected directly to V

frequency distribution.

XTAL

output The output of the on-chip clock oscillator inverter.

3 Clock Out output The buffered output of the on-chip-clock oscillator inverter. If a Xtal input is

used, this output should be connected directly to the Clock In pin. This output can support up to 3 additional MX641 ICs. See Figure 3 for details of clock frequency distribution.

4 Clock In input The 3.579545 clock pulse input to the internal clock dividers. If an externally

generated clock pulse input is used, the Xtal/Clock input pin should be connected to V

Output Enable

input For multi-chip output multiplexing; controls the state of both Ch1 and Ch2

outputs. When this input is placed high (logic '1') both outputs are set to a high impedance. When placed low (logic '0') both outputs are enabled.

6 Ch 2 Output output The digital output of the Channel 2 SPM detector when enabled. The format of

the signal at this pin, in common with Ch 1, is selectable to either 'Tone Follower' or 'Packet' mode via the Output Select input.

7 Ch 1 Output output The digital output of the Channel 1 SPM detector when enabled. The format of

the signal at this pin, in common with Ch 2, is selectable to either 'Tone Follower' or 'Packet' mode via the Output Select input.

BIAS

power The output of the on-chip analog bias circuitry. Held internally at VDD/2, this

pin should be decoupled to V

9 Ch 1 Amp Out output The output of the Channel 1 Input Amplifier. See Figure 2 and Figure 8.

10 Ch 1 Amp In (-): input The negative input to the Channel 1 Input Amplifier. See Figure 2 and Figure

8. 11 Ch 1 Amp In (+): input The positive input to the Channel 1 Input Amplifier. See Figure 2 and Figure 8. 12 V

power Negative supply (GND).

13 N/C No internal connection; leave open circuit. 14 Ch 2 Amp In (+): input The positive input to the Channel 2 Input Amplifier. See Figure 2 and Figure 8. 15 Ch 2 Amp In (-): input The negative input to the Channel 2 Input Amplifier. See Figure 2 and Figure

8. 16 Ch 2 Amp Out output The output of the Channel 2 Input Amplifier. See Figure 2 and Figure 8. 17 Output Select input A logic input to set the Channel 1 and Channel 2 output modes. When high

(logic '1'), the outputs are in the Tone Follower mode; when low (logic '0'), the outputs are in the Packet mode.

18 Preset Level input A logic input to set the sensitivity mode of the MX641. When high (logic '1'),

both channels are in the Fixed Sensitivity mode. The external components govern the input sensitivity; the System Select input selects 12kHz or 16kHz operation. When low (logic '0'), both channels are in the Controlled Sensitivity mode. Device sensitivities and system selection are via the Chip Select/Serial Data/Serial Clock inputs. This input has an internal pullup resistor on chip (Fixed Sensitivity Mode).

Chip Select

input The Chip Select input for use in data loading when using the MX641 in the

Controlled Sensitivity mode (see Figure 9). The device is selected when this input is set low (logic '0'). When the MX641 is in the Fixed Sensitivity mode this input should be connected to either V

(see Figure 2). See Figure 3 for details of clock

(see Figure 2).

or VDD.

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

Dual SPM Detector 5 MX641 PRELIMINARY INFORMATION

Pin No. Name Type Description

20 Serial Clock input The Serial Clock input for use in data loading when using the MX641 in the

Controlled Sensitivity mode (see Figure 9). Data is loaded to the MX641 on this clock's rising edge. When the MX641 is in the Fixed Sensitivity mode this input should be connected to either V

or VDD.

21 Serial Data input The Serial Data input for use in data loading when using the MX641 in the

Controlled Sensitivity mode (see Figure 9 and Table 4). When the device is in the Fixed Sensitivity mode this input should be connected to either V

or VDD.

22 System Select input In the Fixed Sensitivity mode this pin selects the system frequency. High (logic

‘1’) = 12kHz; Low (logic ‘0’) = 16kHz. In the Controlled Sensitivity mode this pin is inactive and may be left unconnected. This pin has an internal pullup

resistor on chip. 23 N/C No internal connection; leave open circuit. 24 V

power Positive supply rail; a single, stable power supply is required. Critical levels

and voltages within the MX641 are dependent upon this supply. This pin

should be decoupled to V

by a capacitor mounted close to the pin

Table 1: Signal List

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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