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MX631
Features
* * * * *
DATABULLETIN
LOW VOLTAGE SPM DETECTOR
Detects 12 & 16kHz SPM Frequencies Low Power (3.0 VoltMIN <1.0mA) Operation High Speechband Rejection Properties Tone-Follower and Packet Mode Outputs Applications
*Complex and/or Simple Telephone Systems *Call-Charge/-Logging Systems
MX631DW 16-Pin SOIC
MX631P 16-Pin PDIP
XTAL/CLOCK XTAL/CLOCK OSCILLATOR XTAL
CLOCK OUT
CLOCK IN CLOCK DIVIDERS
SYSTEM
VSS
VDD TONE FOLLOWER OUTPUT SYSTEM
(12kHz/16kHz)
TONE FOLLOWER LOGIC INPUT AMP
12kHz/16kHz
SIGNAL IN (+) AMP OUT
VBIAS
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 Processor `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.
(c) 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
+
-
SIGNAL IN (-)
32 1
LEVEL DETECTOR DIVIDER
PERIOD MEASURE PACKET MODE OUTPUT PACKET TONE LOGIC
+20dB
SYSTEM
Low Voltage SPM Detector
2
MX631
Pin
1
Function
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). Xtal: The output of the on-chip clock oscillator inverter. 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. 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.) No internal connection, leave open circuit. No internal connection, leave open circuit. 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). VSS: Negative supply (GND). Signal In (+): Signal In (-): Amp Out: 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.
2 3
4
5 6 7
8 9 10 11 12 13
No internal connection, leave open circuit. 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. 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. 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 1M pullup resistor (12kHz). 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. 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.
14
15
16
(c) 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 XTAL CLOCK OUT
VDD
1 2 3 4 5
16
SYSTEM
C1 PACKET MODE OUTPUT
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
15 14
TONE FOLLOWER OUTPUT
CLOCK IN
CLOCK IN
MX631
13 12 11 10
VBIAS VSS
6 7 8
AMP OUT SIGNAL IN (-) SIGNAL IN (+)
R1 C3 R2 R3 C4
9
R4
C2
Figure 2 - Recommended External Components - Differential Input Mode
Component R1 R2 R3 R4 C1 C2 C3 C4 X1 Value RFEEDBACK RIN (-) RIN (+) RBIAS 1.0F 20% 1.0F 20% CIN(-) CIN(+) 3.579545MHz
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 100k. 2. Refer to following pages for advice on IC Protection from high and spurious line voltages.
Differential Input
Common Mode Input
INPUT AMP
INPUT AMP
Ring (b)
MX631
VBIAS
VBIAS
Figure 3 - Example Input Configurations
(c) 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
+
MX631
-
+
-
Tip (a)
Low Voltage SPM Detector
4
MX631
Application Information ......
25 15
MAXIMUM AMPLIFIER GAIN MIMIMUM AMPLIFIER GAIN
-10
-5
0 5 AMPLIFIER GAIN (dB)
VDD = 3.3 (0.1) VOLTS
10
TEMP = -40 to +85C
20
Application Information ......
SIGNAL LEVELS (dB) 0dB ref: 775mVrms
(c) 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
Figure 4 - Input Gain Calculation Graph
MUST-NOT-DECODE LEVEL
MUST-DECODE LEVEL
-10
-15
-20
-25
-30
-35
-40
-45
-50
-25
-20
-15
Low Voltage SPM Detector
5
MX631
Application Information ......
Input Gain Calculation
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. 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. 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.
Input Gain Components
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. Use this area to keep a permanent record of your calculated gains and components
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 x f0 x R1 When anti-alias capacitors are used, make allowance for reduced gain at the SPM frequency (12kHz or 16kHz).
(c) 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
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.
Low Voltage SPM Detector
6
MX631
Specifications
Absolute Maximum Ratings
Exceeding the maximum rating can result in device damage. Operation of the device outside the operating limits is not implied. Supply voltage Input voltage at any pin (ref VSS = 0V) Sink/source current (supply pins) (other pins) Total device dissipation @ TAMB 25C Derating Operating Temperature Storage temperature range -0.3 to 7.0V -0.3 to (VDD +0.3V) 30mA 20mA 800mW Max. 10mW/C -40C to +85C -40C to +85C
Operating Limits
All device characteristics are measured under the following conditions unless otherwise specified: 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
Characteristics
See Note
Min.
3.0 2.3 2.9 3.558918 0.1 0.1 60.0 0.7 10.0 11.820 12.480 15.760 16.640 7.8 22.0 -36.0 -25.0 40.0
Typ.
100 1.0 14.0
Max.
5.5 1.0 1.0 0.4 3.589368 3.8 30.0 12.180 11.520 16.240 15.360 15.5 -29.0 10.0 48.0
Unit
V mA V V V V MHz s s dB Hz M M M k kHz kHz kHz kHz kHz kHz mVp-p dB dB dB ms ms
Supply Voltage (VDD) at 25C 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
10.0 20.0 -40.0 -
(c) 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. 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.
7. 8.
Application Information ......
12.00kHz
11.52kHz 11.82kHz 12.18kHz 12.48kHz 15.36kHz
16.00kHz
15.76kHz 16.24kHz 16.64kHz
WILL-NOT DECODE FREQUENCIES
WILL-NOT DECODE FREQUENCIES
WILL-NOT DECODE FREQUENCIES
WILL-NOT DECODE FREQUENCIES
FREQUENCIES
F0 - 4%
F0 - 1.5%
F0
F0 + 1.5%
F0 + 4%
F0 - 4%
F0 - 1.5%
F0
FREQUENCIES
F0 + 1.5%
WILL-DECODE
WILL-DECODE
F0 + 4%
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
(c) 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 B E W L PIN 1 X Y C H J P K T
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
ALTERNATIVE PIN LOCATION MARKING
NOTE : All dimensions in inches (mm.) Angles are in degrees
Figure7: 16-pin SOIC Mechanical Outline: order as part no. MX631DW
A
DIM. A B C E E1 H J J1 K L P T Y
Package Tolerances
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
B
E1 Y
E
PIN 1
T
K H L J J1 P
C
NOTE : All dimensions in inches (mm.) Angles are in degrees
Figure7: 16-pin PDIP Mechanical Outline: order as part no. MX631P
(c) 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
COMMUNICATION SEMICONDUCTORS
CML Microcircuits (USA) Inc.
COMMUNICATION SEMICONDUCTORS
CML Microcircuits (Singapore)PteLtd
COMMUNICATION SEMICONDUCTORS
Oval Park, Langford, Maldon, Essex, CM9 6WG, England Tel: +44 (0)1621 875500 Fax: +44 (0)1621 875600 uk.sales@cmlmicro.com 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 us.sales@cmlmicro.com www.cmlmicro.com
No 2 Kallang Pudding Road, 09-05/ 06 Mactech Industrial Building, Singapore 349307 Tel: +65 7450426 Fax: +65 7452917 sg.sales@cmlmicro.com www.cmlmicro.com
D/CML (D)/2 May 2002

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