FX623 Datasheet, PDF (1/6 Pages) List of Unclassifed Manufacturers – Call Progress Tone Decoder

CML Semiconductor Products
PRODUCT INFORMATION
FX623 ^{Call Progress Tone Decoder}
Features
Measures Call Progress Tone
Frequencies
[‘Busy’, ‘Dial’, ‘Fax-Tone’ etc.]
Telephone, PABX, Fax and
Dial-Up Modem Applications
Low-Power Requirement
(600µA at 3.3 Volts_TYP)
for Line-Powered Applications
Publication D/623/3 July 1994
Provisional Issue
Custom Tone Decoder
[13 Call-Progress Frequencies
Recognized]
Operates to a 3.579545MHz
Telephone System Clock
Operates Under Simple Logic
or µProcessor System Control
SIGNAL IN
CHIP SELECT
LIMITER
DIGITAL
FILTER
XTAL/CLOCK
XTAL
HOLD
PURS
XTAL/CLOCK ^Clocks
OSCILLATOR
CONTROL
CIRCUITRY
V_DD
MEASUREMENT
AND
DECODE
V_SS
Clocks
TIMER
OUTPUT
LATCHES
DATA
CHANGE
DATA
OUTPUTS
Q0
Q1
Q2
Q3
IRQ
FX623
Fig.1 Functional Block Diagram
Brief Description
The FX623 is a low-power decoding microcircuit that
measures the frequency of telephone system call
progress tones.
With progress signals input from the telephone line,
this single-chip product is programmed to recognize up
to thirteen of the World's most commonly used
call-progress frequencies, analyze signal quality and
present the measured result as a 4-bit parallel data
word at the tri-state Data Output.
Using the parallel information from the FX623, the
host system suitably configured, can recognize such
call progress information as: ‘Dial’, ‘Busy’, ‘Number
Unobtainable’, ‘Ringing’ and Fax/Modem system
signals.
This information can then be employed in telephone
applications (simple or complex) to control telephone
operations. The data output will require a suitable
software format to analyze the frequency information
from the FX623.
Requiring only a single 3.0_[MIN] volt power supply, the
FX623 may be line-powered and will operate under
simple logic or system µProcessor control using the
'Data-Change, 'Hold' and 'Chip-Select' functions.
The FX623, whose small size and low power
consumption makes it ideal for remote applications,
requires a 3.579545MHz telephone system clock or Xtal
input, is available in a 16-pin plastic DIL package.