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MX643, MX651DW, MX667

Table of contents:
Info of MX643
Info of MX651DW
Info of MX667

MX643, MX651DW, MX667 Selling Leads, Datasheet

MFG:CML Package Cooled:SOP16 D/C:05/06+

MX643, MX651DW, MX667 Datasheet download

Five Points

Part Number: MX643

MFG: CML

Package Cooled: SOP16

D/C: 05/06+

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MX643 General Description

The MX643 Call Progress Tone Detector uses different tone detection methods from those commonly found with other Call Progress Tone Detectors.

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. Each signal amplitude in this range is then checked against a level threshold. Any signal of acceptable level in this frequency band is classed as a Call Progress tone, including speech and noise. False outputs caused by speech are commonly indicated by such
products and background noise may lead to a stuck detect output.

In contrast, the MX643 uses a stochastic signal processing technique. This technique is based on analysis of both
the frequency and time domains, with signal amplitude forming a minor part in the decision process. This analysis
includes, checks on whether the signal has a profile which matches international standards for Call Progress
Tones, Special Information Tones, or a profile more likely to match that of speech, noise or other Non-Call
Progress signals. Checks are also performed to see if the signal is a single tone, and whether the tones which
include frequencies corresponding with the 'U.S. Busy' signals have been detected.

MX643 Maximum Ratings

General	Min.	Max.	Units
Supply (V_DD - V_SS)	-0.3	7.0	V
Voltage on any pin to V_SS	-0.3	V_DD+0.3	V
Current
V_DD	-30	30	mA
V_SS	-30	30	mA
Any other pin	-20	20	mA
P/DW Package
Total Allowable Power Dissipation at TAMB = 25°C		800	mW
Derating above 25°C		13	mW/°Cabove25°C
Storage Temperature	-55	125	°C
Operating Temperature	-40	85	°C

MX643 Features

· International Special Information Tone Identification
· Worldwide Tone Compatibility
· Single and Dual Tone Detected
· U.S. Busy-Detect Output
· Voice-Detect Output
· Wide Dynamic Range > 40dBm
· - 40°C to 85°C Operating Temp
· Low Supply Current (0.3mA/0.5mA)
· Low Supply Voltage (3.3V/5.0V)
· Standard 3.58MHz Clock Input
· Standard 8-pin DIP Package

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