CMLMICRO FX633

CML Semiconductor Products
Call Progress Tone Detector
FX633
D/633/3 March 1996
1.0
Features
Provisional Issue
•
Worldwide Tone Compatibility
•
Wide Dynamic Signal Range
•
Single and Dual Tones Detected
•
Low Voltage Operation
•
Special US Busy-Detect Output
•
Standard 8-Pin DIP Package
•
Special Voice-Detect Output
•
Standard 3.58MHz Xtal
1.1
Brief Description
The FX633 detects the audible tone signals used by most of the world's Telecom Systems to indicate
Dial, Ringing, Busy and other conditions found when placing a call. Detection of these call progress
stages is essential to the proper operation of automatic calling products.
The FX633 adds new features to Call Progress monitoring. It detects and indicates separately the "US
Busy" tones, reducing the need to measure "tone cadence" to identify "US Busy". It detects and
separately indicates "Voice" and other signals from Call Progress tones, reducing voice-falsing and
adding voice-answer as a connection prompt.
The FX633 uses the latest signal processing techniques to provide these advantages. It is a low cost,
low power product with superior performance. It is available in the industry standard package.
 1996 Consumer Microcircuits Limited
Call Progress Tone Detector
FX633
CONTENTS
Section
Page
1.0 Features.......................................................................................................... 1
1.1 Brief Description............................................................................................ 1
1.2 Block Diagram................................................................................................ 3
1.3 Signal List....................................................................................................... 4
1.4 External Components.................................................................................... 5
1.5 General Description....................................................................................... 6
1.5.1 Overall Function Description ........................................................... 6
1.5.2 Glossary .......................................................................................... 6
1.5.3 Block Diagram Description .............................................................. 7
1.5.4 Decode Output Truth Table ............................................................. 7
1.6 Application Notes .......................................................................................... 7
1.6.1 General............................................................................................ 7
1.7 Performance Specification ........................................................................... 8
1.7.1 Electrical Performance .................................................................... 8
1.7.2 Packaging...................................................................................... 12
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Call Progress Tone Detector
1.2
FX633
Block Diagram
Figure 1 Block Diagram
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Call Progress Tone Detector
1.3
FX633
Signal List
Package
D4
Package
P1
Pin No.
Pin No.
Name
Type
2
1
XTAL/CLOCK
I/P
The input to the on-chip oscillator, for external
Xtal circuit or clock.
3
2
XTALN
O/P
The inverted output of the on-chip oscillator.
5
3
ENABLE
I/P
A logic "0" pulse of at least 1µs applied to this
input resets the decoder circuits and forces both
DETECT1 and DETECT2 outputs to a logic "0".
7
4
DETECT1
O/P
When a call progress signal is detected, this
output goes to a logic "1".
10
5
SIGIN
I/P
Signal input. Signals to this pin should be ac
coupled. The dc bias of this pin is set internally.
12
6
Vss
Power
13
7
DETECT2
O/P
Signal
Description
The negative supply rail (ground).
This output is used in conjunction with
DETECT1.
When DETECT1 is at a logic "1", this output
goes to a logic "1" if a Call Progress High Band
signal is detected.
When DETECT1 is at a logic "0", this output
goes to a logic "1" if a Non Call Progress signal
is detected.
15
8
VDD
NC
1, 4, 6,
8, 9, 11,
14, 16
Notes: I/P =
O/P =
Power
The positive supply rail. This pin should be
decoupled to VSS by a capacitor.
Internal Connection. Do not make any
connection to these pins.
Input
Output
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Call Progress Tone Detector
1.4
FX633
External Components
Typical Values:
R1
C1
C2
C3
C4
X1
1MΩ ± 10%
33pF ± 20%
33pF ± 20%
1nF ± 20% at 5V, 560pF ± 20% at 3.3V.
0.1µF ± 20%
3.579545MHz (refer to Section 1.7.1)
Figure 2 Recommended External Components
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Call Progress Tone Detector
1.5
General Description
1.5.1
Overall Function Description
FX633
The FX633 Call Progress Tone Detector uses different tone detection methods from those commonly
found with other products.
Many traditional devices use a bandpass filter followed by an energy detector. The filter is usually
designed to pass input signals with a frequency between about 300Hz and 700Hz, and the amplitudes
of signals in this range are then checked against a level threshold. Any signal of acceptable level in
this frequency band is classed as a Call Progress tone, including signals due to speech and noise.
False outputs caused by speech are a common feature with these products, and background noise
may lead to a stuck "detect" output.
The FX633, by contrast, uses a stochastic signal processing technique based on analysis in both the
frequency and time domain, with signal amplitude forming a small part in the decision process. This
analysis includes checks on whether the signal has a "profile" which matches international standards
for Call Progress tones, or a profile more likely to match that of speech, noise or other non-callprogress signals. It also adds checks on whether tones which include frequencies corresponding with
the "US Busy" signals have been detected.
The following Glossary, and the Decode Truth Table in section 1.5.4, provide a simple explanation of
the decoding functions and features offered by the FX633.
1.5.2
Glossary
Call Progress Tones: The single and dual frequency tones in the range 350Hz to 620Hz specified
widely for call progress signalling.
Call Progress Band: The nominal range 340Hz to 650Hz within which the FX633 will detect Call
Progress tones. The detection algorithm requires that the tones have the characteristics typical of Call
Progress Tones.
Call Progress Low Band: The nominal range 340Hz to 490Hz. The FX633 will detect single or dual
tones falling entirely within this range as Call Progress Low Band tones.
Call Progress High Band: The nominal range 600Hz to 650Hz. Single tones in this range, or dual
tones having a material frequency component within this range (e.g. 480 + 620Hz), are detected as
Call Progress High Band tones.
Non Call Progress Signal: A signal falling within the nominal range (a) 200Hz to 800Hz, but NOT
within the Call Progress Band, or (b) within the nominal range 200Hz to 800Hz, but NOT meeting the
DETECTION REQUIREMENTS when the signal falls in the Call Progress Band.
Subject to the duration and other characteristics of such signals, the FX633 will usually interpret these
as a Non Call Progress Signal (e.g. speech or other signal activity).
Minimum Input Signal: The minimum signal level for the specified tone decoding performance. The
lower level at which absence of an input signal will be registered is not specified.
No Signal: A signal falling outside the nominal range 120Hz to 900Hz or the absence of an input
signal. Either will be detected as a No Signal condition.
Nominal: Subject to dynamic tolerances within the signal analysis process. Absolute values are not
material or adverse to performance.
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Call Progress Tone Detector
1.5.3
FX633
Block Diagram Description
(reference Figure 1)
Slicer
The input signal to the slicer is amplified by a self-biased inverting amplifier. The dc bias of this input is
internally set at ½VDD.
Signal Analyser
The frequency range, quality and consistency of the input signal is analysed by this functional block. To
be classified as a call progress signal the input signal frequencies should lie between 340Hz and
650Hz. The signal to noise ratio must be 16dB or greater. The signal must be consistent over a period
of about 140 ms. These decode criteria are continuously monitored and the assessment is updated
every 7 ms, reference Figure 3.
The analyser samples the call progress signal at 9.3kHz; so care should be taken to avoid high
frequency signals (e.g. 18kHz) aliasing into the call progress band.
Control Logic
This block categorises the nature of the signal into various decoded output states and controls the two
output pins. See the Decode Output Truth Table in section 1.5.4.
Xtal/Clock Oscillator
If the on-chip Xtal oscillator is to be used, then external components X1, R1, C1 and C2 are required.
If an external clock source is to be used, then it should be connected to the XTAL/CLOCK input pin
and the XTALN pin should be left unconnected.
1.5.4
Decode Output Truth Table
DETECT2
DETECT1
CONDITIONS
0
0
No Signal
0
1
Call Progress Low Band:
Will detect 350+440, 400+450, 440+480,
400, 425, 440, and 450Hz tones
1
1
Call Progress High Band:
Will detect 480+620, 600 and 620Hz tones
1
0
Non Call Progress signal, e.g. Voice Activity
Note that DETECT1 responds to the whole range of call progress tones from 340Hz to 650Hz.
1.6
Application Notes
1.6.1
General
On power-up, a logic "0" at the ENABLE input may be used to disable and initialise the
device.
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Call Progress Tone Detector
1.7
Performance Specification
1.7.1
Electrical Performance
FX633
Absolute Maximum Ratings
Exceeding these maximum ratings can result in damage to the device.
Min.
-0.3
-0.3
-30
-20
Max.
7.0
VDD + 0.3
+30
+20
Units
V
V
mA
mA
P1 Package
Total Allowable Power Dissipation at Tamb = 25°C
... Derating
Storage Temperature
Operating Temperature
Min.
Max.
800
13
+125
+85
Units
mW
mW/°C
°C
°C
D4 Package
Total Allowable Power Dissipation at Tamb = 25°C
... Derating
Storage Temperature
Operating Temperature
Min.
Max.
800
13
+125
+85
Units
mW
mW/°C
°C
°C
Max.
5.5
3.59
Units
V
MHz
Supply (VDD - VSS)
Voltage on any pin to VSS
Current into or out of VDD and VSS pins
Current into or out of any other pin
-55
-40
-55
-40
Operating Limits
Correct operation of the device outside these limits is not implied.
Notes
Supply (VDD - VSS)
Xtal Frequency
 1996 Consumer Microcircuits Limited
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Min.
3.0
3.57
D/633/3
Call Progress Tone Detector
FX633
Operating Characteristics
For the following conditions unless otherwise specified:
Xtal Frequency = 3.579545MHz, S/N = 16 dB, Noise Bandwidth = 5 kHz,
VDD = 3.3V to 5.0V, Tamb = - 40°C to +85°C. 0dB = 775mVrms.
Notes
DC Parameters
IDD (ENABLE = "1")
IDD (ENABLE = "1")
(VDD = 5.0V)
(VDD = 3.3V)
AC Parameters
SIGIN pin
Input Impedance
Minimum Input Signal Level
Input Signal Dynamic Range
Signal to Noise Ratio
Xtal/Clock Input
'High' Pulse Width
'Low' Pulse Width
Input Impedance (at 100Hz)
Gain (I/P = 1mV rms at 100Hz)
Logic Interface
Input Logic "1" Level
Input Logic "0" Level
Input Leakage Current (Vin = 0 to VDD)
Input Capacitance
Output Logic "1" Level (lOH = 120µA)
Output Logic "0" Level (lOL = 360µA)
Notes:
1.
2.
3.
4.
5.
6.
Min.
Typ.
Max.
Units
1
1
0.5
0.3
1.0
0.7
mA
mA
2
3
3
0.35
-40
40
16
MΩ
dB
dB
dB
4
4
40
40
10
20
ns
ns
MΩ
dB
5
5
5
5
6
6
80%
20%
+5.0
−5.0
10.0
90%
10%
VDD
VDD
µA
pF
VDD
VDD
Not including any current drawn from the device pins by external circuitry.
Small signal impedance over the frequency range 100Hz to 2000Hz and at 5.0V.
The input level is not critical as the detector uses a stochastic algorithm.
Timing for an external input to the XTAL/CLOCK pin.
ENABLE pin.
DETECT1 and DETECT2 pins.
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Call Progress Tone Detector
1.7.1
FX633
Electrical Performance (continued)
Figure 3 Timing Diagram: Call Progress Tone(s)
Figure 4 Timing Diagram: Non Call Progress Signal
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Call Progress Tone Detector
1.7.1
FX633
Electrical Performance (continued)
Figure 5 Timing Diagram: Call Progress Tone(s) to Non Call Progress Signal
For the following conditions unless otherwise specified:
Xtal Frequency = 3.579545MHz, VDD = 3.3V to 5.0V, Tamb = - 40°C to +85°C, S/N = 20dB.
Notes
Min.
Typ.
Max.
Units
70
ms
Signal Timings (ref. Figures 3, 4 and 5)
tI
Burst Length Ignored
tL
Burst Length Detected
tGI
Call Progress Tone Gap Length Ignored
7
tGD
Call Progress Tone Gap Length Detected
7
tRP
Call Progress Tone Response Time
145
ms
tDRP
Call Progress Tone De-response Time
145
ms
tGDR
Gap Detected Recorded
8
tNG
Non Call Progress Signal Gap Length Ignored
9
tNRP
Non Call Progress Signal Response Time
tDNRP
Non Call Progress signal De-response Time
tCH
State Change
Notes:
7.
8.
9.
145
ms
20
40
ms
6
ms
80
145
ms
ms
80
0
ms
ms
ms
Only applies to bursts of the same frequency.
To acknowledge a short tone gap ≥ 40 ms, No Signal is indicated for a minimum of 6ms.
If the gap > 90 ms, a No Signal state will be decoded.
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Call Progress Tone Detector
1.7.2
FX633
Packaging
Figure 6 P1 Mechanical Outline: Order as part no. FX633P1
Figure 7 D4 Mechanical Outline: Order as part no. FX633D4
Handling precautions: This product includes input protection, however, precautions should be taken to prevent
device damage from electro-static discharge. CML does not assume any responsibility for the use of any
circuitry described. No IPR or circuit patent licences are implied. CML reserves the right at any time without
notice to change the said circuitry and this product specification. CML has a policy of testing every product
shipped using calibrated test equipment to ensure compliance with this product specification. Specific testing
of all circuit parameters is not necessarily performed.
CONSUMER MICROCIRCUITS LIMITED
1 WHEATON ROAD
WITHAM - ESSEX CM8 3TD - ENGLAND
Telephone:
Telefax:
+44 1376 513833
+44 1376 518247
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.
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)/1 February 2002