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FX602 Datasheet(PDF) 8 Page - CML Microcircuits

Part No. FX602
Description  CALLING LINE IDENTIFIER
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Maker  CMLMICRO [CML Microcircuits]
Homepage  http://www.cmlmicro.com
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FX602 Datasheet(HTML) 8 Page - CML Microcircuits

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Calling Line Identifier
FX602
© 1998 Consumer Microcircuits Limited
8
D/602/7
The Input Signal Amplifier may also be used with an unbalanced signal source as shown in Figure 3b. The
values of R6 and R8 are as for the balanced input case.
Figure 3b : Input Signal Amplifier, unbalanced input configuration
0
100
200
300
400
500
600
700
800
900
1000
3
3.5
4
4.5
5
5.5
R8
R9
Nominal VDD
Figure 3c : Input Signal Amplifier, optimum values of R8 and R9 vs VDD
1.5.3
Bandpass Filter
Is used to attenuate out of band noise and interfering signals which might otherwise reach the FSK
Demodulator, Tone Alert Detector and Level Detector circuits. The characteristics of this filter differ in FSK and
Tone Alert modes. Most of the filtering is provided by Switched Capacitor stages clocked at 57.7kHz.
1.5.4
Level Detector
This block operates by measuring the level of the signal at the output of the Bandpass Filter, and comparing it
against a threshold which depends on whether FSK Receive or Tone Alert Detect mode has been selected.
In Tone Alert Detect mode the output of the Level Detector block provides an input to the Tone Alert Signal
Detector.


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