CMX661(2001) データシートの表示（PDF） - CML Microsystems Plc
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CMX661 Datasheet PDF : 16 Pages
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Pair Gain Dual SPM Detector
1.4 External Components
CMX661
Figure 2 Typical External Components
R1 120kΩ
R2 120kΩ
R3 100kΩ
R4 100kΩ
R5 120kΩ
R6 120kΩ
±1% R7 100kΩ
±1% C1
±1% R8 100kΩ
±1% C2
±1% R9 15kΩ
±1% C3
±1% R10 15kΩ
±1% C4
±1%
C5
±1% X1 3.579545MHz
C6
1.0µF
1.0µF
330pF
330pF
330pF
330pF
±20%
±20%
±5%
±5%
±5%
±5%
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 1.6.4). 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 Consumer Microcircuits Limited
6
D/661/2
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