CMX661 查看數據表（PDF） - MX-COM Inc
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CMX661 Datasheet PDF : 14 Pages
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Pair Gain Dual SPM Detector
3. External Components
Page 5 of 14
CMX661 Advance Information
Figure 2: Typical External Components
R1
120kΩ
±1% R7
100kΩ
±1% C1
1.0µF
±20%
R2
120kΩ
±1% R8
100kΩ
±1% C2
1.0µF
±20%
R3
100kΩ
±1% R9
15kΩ
±1% C3
330pF
±5%
R4
100kΩ
±1% R10
15kΩ
±1% C4
330pF
±5%
R5
120kΩ
±1%
C5
330pF
±5%
R6
120kΩ
±1% X1 3.579545MHz
C6
330pF
±5%
Table 2: Recommended External Components
Input amplifier components R1, C3, R2, C4, R5, C5, R6 and C6 should be chosen to set the required
sensitivity of the CMX661 (see Section 5.4). Typical values only are shown above. Note that when
calculating/selecting gain components, R3, R4, R7 and R8 should always be greater than or equal to 100kΩ.
VBIAS is not available from the CMX661 and so must be generated by an external voltage divider (R9 and R10)
from VDD. 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 CMX661 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 voltages applied.
©2001 MX-COM, INC.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480228.001
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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