CMLMICRO MX631DW

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
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respectively. These products use the same silicon etc. and today still carry the same prefixes.
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(UK)Ltd
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