CMX631A Ver la hoja de datos (PDF) - MX-COM Inc
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CMX631A Datasheet PDF : 12 Pages
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Low Voltage SPM Detector
8
CMX631A PRELIMINARY INFORMATION
4.3.2 Input Gain Components
Reference the gain components found in Table 2 and Figure 2. The user should calculate and select external
components (R1/R3/C3 and R2/R4/C4) to provide amplifier gain within the limits obtained in Section 4.3.1.
Component tolerances should not move the gain-figure outside these limits. The graphs in Figure 4 and
Figure 5 are for the calculation of input gain components for a CMX631A using a VDD of 3.0 (±0.1) or VDD of
5.0 (±0.5).
4.4 ‘WILL’/’WILL-NOT’ Detect Frequencies
11.52kHz
12.00kHz
11.82kHz
12.18kHz
12.48kHz
15.36kHz
16.00kHz
15.76kHz
16.24kHz
16.64kHz
F0 - 4%
F0 - 1.5% F0 F0 + 1.5%
F0 + 4%
F0 - 4%
F0 - 1.5% F0 F0 + 1.5%
Figure 6: ‘WILL’/’WILL-NOT’ Detect Frequencies
F0 + 4%
5 Applications
5.1 Input Configurations
Differential Input
Common Mode Input
Tip (a)
Ring (b)
INPUT AMP
-
+
CMX631A
VBIAS
INPUT AMP
-
+
CMX631A
VBIAS
Figure 7: Input Configurations
5.1.1 Protection Against High Voltages
Telephone systems may have high DC and AC voltages present on the line. If the CMX631A is a part of host
equipment that has its own signal input protection circuitry, there will be no need for further protection as long
as the voltage on any pin is limited to within VDD +0.3V and VSS -0.3V.
If the host system does not have input protection, or there are signals present outside the device's specified
limits, the CMX631A will require protection diodes at its signal inputs (+ and -). The breakdown voltage of
capacitors and the peak inverse voltage of the diodes must be sufficient to withstand the sum of the DC
voltages plus all expected signal peaks.
© 1999 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 336 744-5050 Fax: 336 744-5054
Doc. # 20480177.004
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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