CMX673 Просмотр технического описания (PDF) - MX-COM Inc
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CMX673 Datasheet PDF : 11 Pages
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Call Progress Tone Detector
Page 7 of 11
CMX673 Preliminary Information
5 Application Notes
5.1 General
On power-up, it will take 80ms to initialize the internal state, this delay should be accounted for before the
DETECT output is valid.
5.1.1 Typical Telephone Line Circuit
XTAL/CLOCK 1
8
X1
XTAL 2
7
CMX673P1
ENABLE 3
6
VDD
VDD
C2
VREF
VSS
DETECT 4
5 SIGIN
R5
R3
R2
-
+
R1 C3
R4 C4
Figure 3: A typical Telephone Line Circuit Application
Phone
Line
R1 Note 1 470kΩ ±1%
R2 Note 1 470kΩ ±1%
R3 Note 1 240kΩ ±1%
R4 Note 1 470kΩ ±1%
R5 Note 1
160kΩ
C3 Note 1 0.01µF 250V
C4 Note 1 0.01µF 250V
Note:
1. Resistor and Capacitor tolerance levels are as indicated, unless otherwise stated.
2. A low offset opamp is needed.
An Alternative set of component values can be used:
±1%
±2%
±2%
R1 Note 1 499kΩ ±1%
R2 Note 1 499kΩ ±1%
R3 Note 1 54.9kΩ ±1%
R4 Note 1 499kΩ ±1%
R5 Note 1
49.9kΩ
±1%
C3 Note 1, 2 0.001µF (300V) ±2%
C4 Note 1, 2 0.001µF (300V) ±2%
Note:
1. Resistor and Capacitor tolerance levels are as indicated, unless otherwise stated.
2. A higher value of C3 and C4 will reduce the level sensitivity tolerance at around -38dBm.
ã2001 MX-COM, Inc
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480182.007
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All Trademarks and service marks are held by their respective companies.
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