CMX602B Ver la hoja de datos (PDF) - CML Microsystems Plc

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CMX602B

Calling Line Identifier plus Call Waiting (Type II)

CML Microsystems Plc 

Calling Line Identifier

CMX602B

The CMX602B has been designed to meet the applicable specifications with R8 = 430kΩ at VDD = 3.0V

nominal, rising to 680kΩ at VDD = 5.0V, and R9 should be 240kΩ at VDD = 3.0V and 200kΩ at VDD = 5.0V

as shown in section 1.4 and Fig 3c.

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

1000

900

800

700

R8

600

500

400

300

R9

200

100

0

3

3.5

4

4.5

5

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.

 2003 CML Microsystems Plc

8

D/602B/2

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