MX COM Inc CMX631AD4, CMX631AP3, CMX631AD5 Datasheet
DATA BULLETIN
CMX631A
© 1999 MX
•COM Inc. www.mxcom.com Tele: 800 638-5577 336 744-5050 Fax: 336 744-5054 Doc. # 20480177.004
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
PRELIMINARY INFORMATION
Features Applications
•
Detects 12kHz or 16kHz SPM
Frequencies
•
Tone Follower and Packet Mode
Outputs
•
High Speech-Band Rejection
Properties
•
Low Power Operation (3.0V < 0.8mA)
•
Call Charge Applications on PABX Line
Cards
•
Complex and/or Simple telephone
Systems
•
Remote Telephone/Payphones
+
-
1
32
PERIOD
MEASURE
TONE
FOLLOWER
LOGIC
PACKET
TONE
LOGIC
DIVIDER
SIGNAL IN (-)
AMP OUT
XTAL/CLOCK
SYSTEM (12kHz/16kHz)
SYSTEM
SYSTEM
CLOCK IN
CLOCK OUT
TONE FOLLOWER
OUTPUT
V
SS
V
DD
V
BIAS
P ACKET MODE
OUTPUT
SIGNAL IN (+)
LEVEL DETECTOR
+20dB
12kHz/16kHz
XTAL
CLOCK
DIVIDERS
INPUT AM P
XTAL/CLOCK
OSCILLATOR
The CMX631A is a low-power, system-selectable Subscriber Pulse Metering (SPM) detector that indicates the
presence of both 12kHz or 16kHz telephone call-charge 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. 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 CMX631A demonstrates exceptional 12kHz and 16kHz performance in the presence of both voice and
noise. This device may operate from a single or differential analog signal input, from which two individual
logic outputs will be produced; a Tone Follower Output or a Packet Mode Output.
This system (12kHz/16kHz) selectable integrated circuit, requires a 2.7V to 5.5V power supply, which may be
line-powered, is available in the following packages: 24-pin SSOP (CMX631AD5), 16-pin SOIC
(CMX631AD4), and 16-pin PDIP (CMX631AP3). Additional package styles may be available to meet specific
design requirements.
Low Voltage SPM Detector 2 CMX631A PRELIMINARY INFORMATION
© 1999 MX•COM Inc. www.mxcom.com Tele: 800 638-5577 336 744-5050 Fax: 336 744-5054 Doc. # 20480177.004
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
CONTENTS
Section Page
1 Block Diagram................................................................................................................3
2 Signal List.......................................................................................................................4
3 External Components....................................................................................................5
4 General Description.......................................................................................................6
4.1 Tone Follower Mode............................................................................................................ 6
4.2 Packet Mode........................................................................................................................ 6
4.3 Sensitivity Setting ................................................................................................................ 6
4.3.1 Input Gain Calculation............................................................................................................6
4.3.2 Input Gain Components .........................................................................................................8
4.4 ‘WILL’/’WILL-NOT’ Detect Frequencies............................................................................... 8
5 Applications ...................................................................................................................8
5.1 Input Configurations ............................................................................................................ 8
5.1.1 Protection Against High Voltages...........................................................................................8
5.1.2 Aliasing...................................................................................................................................9
6 Performance Specification............................................................................................9
6.1 Electrical Specifications....................................................................................................... 9
6.1.1 Absolute Maximum Ratings....................................................................................................9
6.1.2 Operating Limits...................................................................................................................10
6.1.3 Operating Characteristics.....................................................................................................10
6.2 Packages........................................................................................................................... 11
MX-COM, Inc. reserves the right to change specifications at any time and without notice.
Low Voltage SPM Detector 3 CMX631A PRELIMINARY INFORMATION
© 1999 MX•COM Inc. www.mxcom.com Tele: 800 638-5577 336 744-5050 Fax: 336 744-5054 Doc. # 20480177.004
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
1 Block Diagram
+
-
1
32
PERIOD
MEASURE
TONE
FOLLOWER
LOGIC
PACKET
TONE
LOGIC
DIVIDER
SIGNAL IN (-)
AMP OUT
XTAL/CLOCK
SYSTEM (12kHz/16kHz)
SYSTEM
SYSTEM
CLOCK IN
CLOCK OUT
TONE FOLLOWER
OUTPUT
V
SS
V
DD
V
BIAS
P ACKET MODE
OUTPUT
SIGNAL IN (+)
LEVEL DETECTOR
+20dB
12kHz/16kHz
XTAL
CLOCK
DIVIDERS
INPUT AM P
XTAL/CLOCK
OSCILLATOR
Figure 1: Block Diagram
Low Voltage SPM Detector 4 CMX631A PRELIMINARY INFORMATION
© 1999 MX•COM Inc. www.mxcom.com Tele: 800 638-5577 336 744-5050 Fax: 336 744-5054 Doc. # 20480177.004
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
2 Signal List
Packages Signal
D5 D4/P3 Name Type
Description
1 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
DD
See Figure 2 and
Section 3.
42
XTAL
output The output of the on-chip clock oscillator inverter.
5 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.
6 4 Clock In input The 3.579545MHz clock pulse input to the internal clock
dividers. If an externally generated clock pulse is used, the
Xtal/Clock input pin should be connected to V
DD
. Reference
Section 3.
87V
BIAS
power The output of the on-chip analog bias circuitry. Held internally
at V
DD
/2, this pin should be bypassed to VSS. See Figure 2.
12 8 V
SS
power Negative supply (GND).
13 9 Signal In + input The positive input to the input gain adjusting signal amplifier.
Reference Section 4.3 and 4.4.
17 10 Signal In - input The negative input to the input gain adjusting signal amplifier.
Reference Section 4.3 and 4.4.
18 11 Amp Out input The output of the input gain adjusting signal amplifier.
Reference Section 4.3 and 4.4.
19 13 Tone
Follower
Mode
output This output provides a logic 0 for the period of a detected tone
and a logic 1 for a NOTONE detection. See Section 4.1 and
Figure 3.
20 14 Packet Mode output This output provides a logic 0 for a detected tone and a logic 1
for NOTONE detection and will ignore a small fluctuation or
fade during the tone signal. See Section 4.2 and Figure 3.
21 15 System input This logic input selects the device operation to either 12kHz
(logic 1) or 16kHz (logic 0) SPM systems. This input has an
internal 1MΩ pull-up resistor (12kHz).
24 16 V
DD
power Positive supply. A single, stable power supply is required.
Critical levels and voltages within the CMX631A are dependent
upon this supply. This pin should be bypassed to V
SS
by a
capacitor mounted close to the pin. Note: If this device is line
powered, the resulting power supply must be stable. See
Section 5.1.1.
2, 3, 7,
9, 10,
11, 14,
15, 16,
22, 23
5,6,12 N/C No internal connection; leave open circuit.
Table 1: Signal List
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