CML Semiconductor Products
PRODUCT INFORMATION
FX613
Universal Call Progress Decoder
Publication D/613/3 December 1995
Features
Covers Worldwide Call Progress
Frequencies (300Hz to 2,150Hz)
3 Volt <1mA Requirement
Decodes Single or Modulated
Tones
Analogue In/Serial Data Out
SERIAL CLOCK
Speech Discrimination Ability
碌Processor Compatible Outputs
Telephone/Telecoms, Radio and
Fax/Modem Applications
Mixed Analogue/Digital
Technology
DATA OUT
0 1 2 3 4 5
SERIAL OUTPUT
PORT (6-BITS)
CHIP SELECT
V DD
CS
LATCH
COUNT
TIME
SIGNAL IN
f
FILTER &
BAND SELECTOR
HI / LO BAND
f/4
FREQUENCY
COUNTER
RESET
LEVEL IN
LEVEL
DETECTOR
DECODE
ON / OFF
HI / LO
VBIAS
FX613
V SS
f/4
SIGNAL QUALITY
ASSESSOR
RESET
GOOD/BAD
LOGIC
RESET
CS
HI / LO
TIME
XTAL/CLOCK
3.579545MHz
CLOCK
GENERATOR
TIMER
LO = 39.4ms
HI = 13.16ms
IRQ
XTAL
Fig.1 Functional Block Diagram
Brief Description
The FX613 is a wide-band, 鈥楴-Tone鈥? non-predictive
tone decoder to measure telephone system call progress
tones in PABX, Pay/Feature-Phone, Fax and Modem
systems.
Adhering to Must/Must-Not Decode limits and able to
measure inband frequencies in outband modulation, this
decoder measures the frequency of input signals in the
range 300Hz to 2,150Hz; the result of each
measurement is presented to a system 碌Processor, as a
6-bit serial word.
The decode frequency range, which covers the
World's call progress application spectrum, is processed
internally as two bands: LO = 300Hz to 660Hz and HI =
900Hz to 2150Hz. Frequency measurement is achieved
by counting the number of cycles in a set time period
(LO = 39.47ms or HI = 13.16ms). Bad signal/level quality
or N
OTONE
results in a count-abort, timing-reset and no
output from the decoder.
Current frequency information is output for the
碌Processor using a Serial Data, Clock and Interrupt
interface.
Data from the FX613 should be processed by a
碌Processor whose algorithms are able to recognize the
frequency, sequence and/or cadence of input signals as
national call progress information; e.g.: 鈥楧ial鈥? 鈥楤usy鈥?
鈥楴umber-Unobtainable鈥? 鈥楻inging鈥?and automatic tones
employed by Fax, Modem systems. Software can be
simply configured to reject speech frequencies.
Due to its 鈥楴-Tone鈥? non-predictive decoding capability,
units employing the FX613 can be redeployed under a
new national standard by a simple software amendment.
Available in 16-pin plastic S.O.I.C. SMD and 14-pin
plastic DIL packages, this low-cost, mixed analogue/digital
microcircuit has a typical power requirement of less than
1mA at 3 volts and utilizes a telecom-system clock input
of 3.579545MHz to maintain frequency accuracy.
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