CMX641A Ver la hoja de datos (PDF) - MX-COM Inc
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CMX641A Datasheet PDF : 23 Pages
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Dual SPM/Security Detector/Generator
3. External Components
7 of 23
CMX641A Advance Information
Figure 2: Recommended External Components
Fixed Bandwidth Operating State, Controlled Sensitivity Mode and Enhanced Features Operating State
R1 68kΩ ±1%
R2 68kΩ ±1%
R3 750kΩ ±1%
R4 750kΩ ±1%
R5 68kΩ ±1%
R6 68kΩ ±1%
R7 750kΩ ±1%
R8 750kΩ ±1%
C1
1.0µF
±20%
C2
1.0µF
±20%
C3
270pF
±5%
C4
270pF
±5%
C5
270pF
±5%
C6
270pF
±5%
X1 3.579545MHz
Table 2: Recommended External Components
Fixed Bandwidth Operating State, Fixed Sensitivity Mode
In this mode input amplifier components are chosen to set the required sensitivity of the CMX641A. (See
section 5.5).
Note: When calculating/selecting gain components, R3, R4, R7 and R8 should always be greater than or
equal to 100kΩ.
Particular attention should be paid to decoupling VDD and keeping the power, ground, and signal lines free
from unnecessary noise.
Telephone systems may have unusually high DC and AC voltages present on the line, as either differential or
common mode signals. If the CMX641A is part of a host system which does not have its own input protection,
then protection diodes must be added to both signal inputs (+ and -) so that the voltage on any pin is limited to
within VSS – 0.3V and VDD + 0.3V. The breakdown voltage of capacitors and the peak inverse voltage of diodes
must be sufficient to withstand the sum of the DC and peak-peak AC voltage applied.
ã2001 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480227.002
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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