DATABULLETIN MX631 LOW VOLTAGE SPM DETECTOR Features • • • • • Detects 12 & 16kHz SPM Frequencies Low Power (3.0 VoltMIN <1.0mA) Operation High Speechband Rejection Properties Tone-Follower and Packet Mode Outputs Applications MX631DW 16-Pin SOIC •Complex and/or Simple Telephone Systems •Call-Charge/-Logging Systems CLOCK OUT XTAL/CLOCK XTAL/CLOCK OSCILLATOR MX631P 16-Pin PDIP CLOCK IN VSS CLOCK DIVIDERS SYSTEM XTAL VDD TONE FOLLOWER OUTPUT TONE FOLLOWER LOGIC SYSTEM (12kHz/16kHz) SIGNAL IN (-) INPUT AMP - 12kHz/16kHz 32 + SIGNAL IN (+) 1 +20dB LEVEL DETECTOR PERIOD MEASURE PACKET MODE OUTPUT DIVIDER AMP OUT VBIAS SYSTEM PACKET TONE LOGIC Figure 1 - Functional Block Diagram Description The MX631 is a low-power, system-selectable Subscriber Pulse Metering (SPM) detector that indicates the presence of both 12kHz or 16kHz telephone callcharge frequencies on a telephone line. Deriving its input directly from the telephone line, input amplitude/sensitivities are component adjustable to the user's national ‘Must/Must-Not Decode’ specifications via an on-chip input amplifier, while the 12kHz and 16kHz frequency limits are accurately defined by the use of an external 3.579545MHz telephone-system Xtal or clock-pulse input. The MX631, which demonstrates high 12kHz and 16kHz performance in the presence of both voice and noise, can operate from either a single or differential analog signal input from which it will produce two individual logic outputs: 1. Tone Follower Output - A 'tone-following' logic output producing a “Low” level for the period of a correct decode and a “High” level for a bad decode or NOTONE. 2. Packet (Cumulative Tone) Mode Output - To respond and/or de-respond after a cumulative 40ms of good tone (orNOTONE) in any 48ms period. This process will ignore small fluctuations or fades of a valid frequency input and is available for µProcessor ‘Wake-Up’, Minimum Tone detection, NOTONE indication or transient avoidance. This system (12kHz/16kHz) selectable integrated circuit, which may be line-powered, is available in 16-pin plastic DIP and SOIC surface mount packages. © 1997 MX•COM, INC. www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc.# 20480087.003 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies Low Voltage SPM Detector Pin 2 MX631 Function 1 Xtal/Clock : The input to the on-chip clock oscillator; for use with a 3.579545MHz Xtal in conjunction with the Xtal output (see Figure 2). Circuit components are on-chip. Using this mode of clock operation, the Clock Out pin should be connected directly to the Clock In pin. If a clock pulse input is employed to the Clock In pin, this pin must be connected directly to VDD (see Figure 2). 2 Xtal: The output of the on-chip clock oscillator inverter. 3 Clock Out: The buffered output of the on-chip clock oscillator inverter. If a Xtal input is employed this output should be connected directly to the Clock In pin. 4 Clock In: The 3.579545MHz clock pulse input to the internal clock-dividers. In the clock pulse input mode the Xtal/Clock input (pin 1) should be connected to VDD. (See Figure 2.) 5 No internal connection, leave open circuit. 6 No internal connection, leave open circuit. 7 VBIAS: The output of the on-chip analog bias circuitry. Held internally at VDD/2, this pin should be decoupled to VSS (see Figure 2). 8 VSS: Negative supply (GND). 9 Signal In (+): 10 Signal In (-): 11 Amp Out: 12 No internal connection, leave open circuit. 13 Tone Follower Output: This output provides a logic “0” (Low) for the period of a detected tone and a logic “1” (High) for NOTONE detection. See Figure 5. 14 Packet Mode Output: A logic output that will be available after a cumulation of 40ms of 'good' tone has been received. This packet tone follower will only respond when a tone frequency of sufficient quality has been received for sufficient time, i.e. a cumulation of 40ms in any 48ms; short tone bursts or breaks will be ignored. This output provides a logic “0” (Low) for a detected tone and a logic “1” (High) for NOTONE detection. See Figure 6. 15 System: The logic input to select device operation to either 12kHz (logic “1” - High) or 16kHz (logic “0” - Low) SPM systems. This input has an internal 1MΩ pullup resistor (12kHz). 16 VDD: Positive supply. A single, stable power supply is required. Critical levels and voltages within the MX631 are dependent upon this supply. This pin should be decoupled to VSS by a capacitor mounted close to the pin. The positive and negative inputs to, and the output from, the input gain adjusting signal amplifier. Refer to Figure 4 for guidance on setting level sensitivities to national specifications, and the selection of gain adjusting components. Note that if this device is ‘line’ powered, the resulting supply must be stable. See notes on IC Protection from high and spurious line voltages. © 1997 MX•COM, INC. www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc.# 20480087.003 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies Low Voltage SPM Detector 3 MX631 Application Information: External Components VDD VDD XTAL/CLOCK XTAL/CLOCK X1 For use with a Clock-Pulse Input - Remove Xtal (X1) - Connect Pin 1 to VDD - Remove link (Pins 3-4) - Input clock pulses to CLOCK IN XTAL CLOCK OUT CLOCK IN CLOCK IN VDD 1 VSS C1 SYSTEM 2 15 3 14 4 13 5 VBIAS 16 PACKET MODE OUTPUT MX631 TONE FOLLOWER OUTPUT 12 6 11 7 10 R1 AMP OUT C3 SIGNAL IN (-) R2 SIGNAL IN (+) 8 9 R3 R4 C4 C2 Figure 2 - Recommended External Components - Differential Input Mode Component R1 R2 R3 R4 C1 C2 C3 C4 X1 Value RFEEDBACK RIN (-) RIN (+) RBIAS 1.0µF ±20% 1.0µF ±20% CIN(-) CIN(+) 3.579545MHz Differential Input Ring (b) 2. Refer to following pages for advice on IC Protection from high and spurious line voltages. Common Mode Input INPUT AMP Tip (a) External Components 1. The values of the Input Amp gain components illustrated are calculated using the Input Gain Calculation Graph (Figure 4). When calculating input gain components, for correct operation, it is recommended that the values of resistors R1 and R4 do not go below 100kΩ. INPUT AMP - - + + MX631 VBIAS MX631 VBIAS Figure 3 - Example Input Configurations © 1997 MX•COM, INC. www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc.# 20480087.003 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies Low Voltage SPM Detector 4 MX631 -50 -45 TEMP = -40° to +85°C VDD = 3.3 (±0.1) VOLTS Figure 4 - Input Gain Calculation Graph SIGNAL LEVELS (dB) 0dB ref: 775mVrms -40 -35 -30 -25 -20 -15 -10 MIMIMUM AMPLIFIER GAIN MUST-NOT-DECODE LEVEL -25 MUST-DECODE LEVEL -20 -15 -10 Application Information ...... -5 0 5 AMPLIFIER GAIN (dB) MAXIMUM AMPLIFIER GAIN 10 15 20 25 Application Information ...... © 1997 MX•COM, INC. www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc.# 20480087.003 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies Low Voltage SPM Detector 5 MX631 Application Information ...... Input Gain Calculation Input Gain Components The input amplifier, with its external circuitry, is provided on-chip to set the sensitivity of the MX631 to conform to the user's national level specification with regard to ‘Must’ and ‘Must-Not’ decode signal levels. With reference to Figure 4, the following steps will assist in the determination of the required gain/ attenuation. The following paragraphs refer to the gain components shown in Figures 2 and 3. The user should calculate and select external components (R1, R2/C3, R3/C4, R4) to provide an amplifier gain within the limits obtained in Steps 2 and 3. Component tolerances should not move the gainfigure outside these limits. It is recommended that the designed gain is near the center of the calculated range. The graph in Figure 4 is for calculations for the input gain components for an MX631 using a VDD of 3.3 (±0.1) volts. Step 1 Draw two horizontal lines from the Y-axis (Signal Levels (dB)). The upper line represents your required ‘Must’ decode level. The lower line represents your required ‘Must-Not’ decode level. Step 2 Mark the intersection of the upper horizontal line and the upper sloping line; drop a vertical line from this point to the X-axis (Amplifier Gain (dB)). The point where the vertical line meets the X-axis indicates the MINIMUM Input Amp gain required for reliable decoding of valid signals. Use this area to keep a permanent record of your calculated gains and components Step 3 Mark the intersection of the lower horizontal line and the lower sloping line; drop a vertical line from this point to the X-axis. The point where the vertical line meets the X-axis indicates the MAXIMUM allowable Input Amp gain. Input signals at or below the ‘Must-Not’ decode level will not be detected as long as the amplifier gain is no higher than this level. Implementation Notes Aliasing Due to the switched-capacitor filters employed in the MX631, be careful to avoid the effects of alias distortion with the external components you choose. Possible Alias Frequencies: 12kHz Mode= 52kHz 16kHz Mode= 69kHz If these alias frequencies are liable to cause problems and/or interference, it is recommended that anti-alias capacitors are used across input resistors R1 and R4. Values of anti-alias capacitors should be chosen to provide a highpass cutoff frequency, in conjunction with R1 (R4) of approximately 20kHz to 25kHz (12kHz system) or 25kHz to 30kHz (16kHz system). i.e. C = 1 2 x π x f0 x R1 Signal Input Protection Telephone systems may have high d.c. and a.c. voltages present on the line. If the MX631 is part of host equipment that has its own signal input protection circuitry, there will be no need for further protection as long as the voltage on any pin is limited to within VDD + 0.3V and VSS -0.3V. If the host system does not have input protection, or there are signals present outside the device's specified limits, the MX631 will require protection diodes at its signal inputs (+ and -). The breakdown voltage of capacitors and the peak inverse voltage of the diodes must be sufficient to withstand the sum of the d.c. voltages plus all expected signal peaks. When anti-alias capacitors are used, make allowance for reduced gain at the SPM frequency (12kHz or 16kHz). © 1997 MX•COM, INC. www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc.# 20480087.003 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies Low Voltage SPM Detector 6 MX631 Specifications Absolute Maximum Ratings Operating Limits Exceeding the maximum rating can result in device damage. Operation of the device outside the operating limits is not implied. All device characteristics are measured under the following conditions unless otherwise specified: Supply voltage Input voltage at any pin (ref VSS = 0V) Sink/source current (supply pins) (other pins) Total device dissipation @ TAMB 25°C Derating Operating Temperature Storage temperature range Characteristics -0.3 to 7.0V -0.3 to (VDD +0.3V) ±30mA ±20mA 800mW Max. 10mW/°C -40°C to +85°C -40°C to +85°C See Note Supply Voltage (VDD) at 25°C Supply Current Input Logic “1” (High) Input Logic “0” (Low) Output Logic “1” (High) Output Logic “0” (Low) Xtal/Clock or Clock In Frequency “High” External Clock Pulse Width “Low” External Clock Pulse Width Input Amp D.C. Gain Bandwidth (-3dB open loop) Input Impedance Logic Impedances Input (System) (Clock In) Output Overall Performance 12kHz Detect Bandwidth 1 12kHz Not-Detect Frequencies (below 12kHz) 1 12kHz Not-Detect Frequencies (above 12kHz) 1 16kHz Detect Bandwidth 1 16kHz Not-Detect Frequencies (below 16kHz) 1 16kHz Not-Detect Frequencies (above 12kHz) 1 Sensitivity 2 Tone Operation Characteristics Signal-to-Noise Requirements (Amp Input) 3,4,5,6 Signal-to-Voice Requirements (Amp Input) 3,4,5,7 Signal-to-Voice Requirements (Amp Output) 5,6 Tone Follower Output Response and De-Response Times 1,8 Packet Mode Output Response and De-Response Times 1,8 VDD = 3.3V TAMB = +25 °C Audio Level 0dB ref: = 775mVrms Noise Bandwidth = 50kHz Xtal/Clock or ‘Clock In’ Frequency = 3.579545MHz 12kHz or 16kHz System Setting Min. Typ. Max. Unit 3.0 2.3 2.9 3.558918 0.1 0.1 - 5.5 1.0 1.0 0.4 3.589368 - V mA V V V V MHz µs µs 60.0 - 100 1.0 - dB Hz MΩ 0.7 10.0 - 14.0 3.8 30.0 MΩ MΩ kΩ kHz kHz kHz kHz kHz kHz mVp-p 11.820 12.480 15.760 16.640 7.8 10.0 12.180 11.520 16.240 15.360 15.5 22.0 -36.0 -25.0 20.0 -40.0 - -29.0 dB dB dB - - 10.0 ms 40.0 - 48.0 ms - © 1997 MX•COM, INC. www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc.# 20480087.003 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies Low Voltage SPM Detector 7 MX631 Characteristics Notes 1. 2. 3. 4. 5. 6. 7. 8. With adherence to Signal-to-Voice and Signal-to Noise specifications. With Input Amp gain setting: 15.5dBMIN/19.5dBMAX. Common Mode SPM and balanced voice signal. Immune to false responses. Immune to false de-responses With SPM and voice signal amplitudes balanced; To avoid false de-responses due to saturation, the peak-to-peak voice+noise level at the output of the Input Amp (12/16kHz Filter Input) should be no greater than the dynamic range of the device. Maximum voice frequencies = 3.4kHz Response, De-Response and Power-up Response Timing. Application Information ...... F0 15.76kHz F0 - 4% WILL-DECODE F0 + 4% 15.36kHz WILL-NOT DECODE FREQUENCIES F0 + 1.5% FREQUENCIES WILL-DECODE F0 - 1.5% 12.48kHz F0 - 1.5% 16.24kHz 16.64kHz F0 + 1.5% F0 + 4% WILL-NOT DECODE FREQUENCIES F0 - 4% 16.00kHz 12.18kHz WILL-NOT DECODE FREQUENCIES WILL-NOT DECODE FREQUENCIES 11.82kHz FREQUENCIES 12.00kHz 11.52kHz F0 Figure 5 - Will/Will-Not Decode Frequencies System Timing SIGNAL INPUT TONE NOTONE TONE FOLLOWER OUTPUT PACKET MODE OUTPUT RESPONSE DELAY SIGNAL INPUT ...... TONE FOLLOWER OUTPUT ...... DERESPONSE DELAY PACKET MODE OUTPUT ...... Figure 6 - Examples of Input and Output Relationships © 1997 MX•COM, INC. www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc.# 20480087.003 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies Low Voltage SPM Detector 8 MX631 Package Tolerances A Z ALTERNATIVE PIN LOCATION MARKING B E W L T PIN 1 X Y C H J K P DIM. A B C E H J K L P T W X Y Z MIN. TYP. MAX. 0.395 (10.03) 0.413 (10.49) 0.286 (7.26) 0.299 (7.59) 0.093 (2.36) 0.105 (2.67) 0.390 (9.90) 0.419 (10.64) 0.003 (0.08) 0.020 (0.51) 0.013 (0.33) 0.020 (0.51) 0.041 (1.04) 0.050 (1.27) 0.016 (0.41) 0.050 (1.27) 0.009 (0.23) 0.0125 (0.32) 45° 0° 10° 7° 5° 5° NOTE : All dimensions in inches (mm.) Angles are in degrees Figure7: 16-pin SOIC Mechanical Outline: order as part no. MX631DW Package Tolerances A B E1 E Y T PIN 1 K C H L J J1 P DIM. A B C E E1 H J J1 K L P T Y MIN. TYP. MAX. 0.810 (20.57) 0.740 (18.80) 0.262 (6.63) 0.240 (6.10) 0.135 (3.43) 0.200 (5.06) 0.390 (9.91). 0.300 (7.62) 0.290 (7.37) 0.325 (8.26) 0.015 (0.38) 0.070 (1.77) 0.014 (0.35) 0.023 (0.58) 0.040 (1.02) 0.065 (1.65) 0.056 (1.42) 0.064 (1.63) 0.150 (3.81) 0.121 (3.07) 0.100 (2.54) 0.008 (0.20) 0.015 (0.38) 7° NOTE : All dimensions in inches (mm.) Angles are in degrees Figure7: 16-pin PDIP Mechanical Outline: order as part no. MX631P © 1997 MX•COM, INC. www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc.# 20480087.003 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies CML Microcircuits COMMUNICATION SEMICONDUCTORS CML Product Data In the process of creating a more global image, the three standard product semiconductor companies of CML Microsystems Plc (Consumer Microcircuits Limited (UK), MX-COM, Inc (USA) and CML Microcircuits (Singapore) Pte Ltd) have undergone name changes and, whilst maintaining their separate new names (CML Microcircuits (UK) Ltd, CML Microcircuits (USA) Inc and CML Microcircuits (Singapore) Pte Ltd), now operate under the single title CML Microcircuits. These companies are all 100% owned operating companies of the CML Microsystems Plc Group and these changes are purely changes of name and do not change any underlying legal entities and hence will have no effect on any agreements or contacts currently in force. CML Microcircuits Product Prefix Codes Until the latter part of 1996, the differentiator between products manufactured and sold from MXCOM, Inc. and Consumer Microcircuits Limited were denoted by the prefixes MX and FX respectively. These products use the same silicon etc. and today still carry the same prefixes. In the latter part of 1996, both companies adopted the common prefix: CMX. This notification is relevant product information to which it is attached. CML Microcircuits (USA) [formerly MX-COM, Inc.] Product Textual Marking On CML Microcircuits (USA) products, the ‘MX-COM’ textual logo is being replaced by a ‘CML’ textual logo. Company contact information is as below: CML Microcircuits (UK)Ltd CML Microcircuits (USA) Inc. CML Microcircuits (Singapore)PteLtd COMMUNICATION SEMICONDUCTORS COMMUNICATION SEMICONDUCTORS COMMUNICATION SEMICONDUCTORS Oval Park, Langford, Maldon, Essex, CM9 6WG, England Tel: +44 (0)1621 875500 Fax: +44 (0)1621 875600 [email protected] www.cmlmicro.com 4800 Bethania Station Road, Winston-Salem, NC 27105, USA Tel: +1 336 744 5050, 0800 638 5577 Fax: +1 336 744 5054 [email protected] www.cmlmicro.com No 2 Kallang Pudding Road, 09-05/ 06 Mactech Industrial Building, Singapore 349307 Tel: +65 7450426 Fax: +65 7452917 [email protected] www.cmlmicro.com D/CML (D)/2 May 2002