CMX602B Просмотр технического описания (PDF) - MX-COM Inc
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CMX602B Datasheet PDF : 22 Pages
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Calling Line Identifier plus Call Waiting (Type II)
7
CMX602B PRELIMINARY INFORMATION
The Input Signal Amplifier may also be used to allow the CMX602B to operate from an unbalanced signal
source as shown in Figure 4. In this unbalanced signal configuration, the values of R6 and R8 are the same
as used for the balanced input configuration.
AMPOUT
A
C6 R6
R8 IN-
-
IN+
VSS
+
VBIAS
Input Signal Amplifier
C9
Figure 4: Input Signal Amplifier, unbalanced input configuration
1000
900
800
700
600
R8
500
400
300
R9
200
100
0
3
3.5
4
4.5
5
Nominal VDD
Figure 5: Input Signal Amplifier, Optimum Values of R8 and R9 vs. VDD
4.3 Bandpass Filter
The Bandpass Filter is used to attenuate out of band noise and interfering signals from reaching the FSK
Demodulator, Tone Alert Detector and Level Detector circuits. The characteristics of this filter differ between
FSK and Tone Alert modes. Switched Capacitor filter stages clocked at 57.7kHz provide primary filtering. If
the input signal is band limited to below 28.85kHz then external anti-aliasing filtering is not required.
2000 MX-COM, Inc
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480204.002
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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