CMX673E3 查看數據表（PDF） - CML Microsystems Plc

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CMX673E3

Call Progress Tone Detector

CML Microsystems Plc 

1.6 Application Notes

1.6.1 General

On power-up, it will take 80ms to initialise the internal state, this delay should be accounted for

before the DETECT output is valid.

XTAL/CLOCK

1

C2

8

X1

R5

XTALN 2

7

VREF

R3

CMX673P1

R2

ENABLE

3

6

DETECT

4

_

5

SIGIN

+

R1

C3

R4

C4

Figure 3 A typical Telephone Line Circuit Application

R1 470kΩ

R2 470kΩ

R3 240kΩ

R4 470kΩ

R5 160kΩ

C3 0.01µF 250V

C4 0.01µF 250V

Phone

Line

Note: 1. Resistors ±1%, Capacitors ±20% unless otherwise stated.

2. A low offset opamp is needed.

An alternative set of component values can be used:

R1 499kΩ

R2 499kΩ

R3 54.9kΩ

R4 499kΩ

R5 49.9kΩ

C3 0.001µF 300V

C4 0.001µF 300V

Note: 3. Resistors ±1%, Capacitors ±2% unless otherwise stated.

4. A higher value of C3 and C4 will reduce the level sensitivity tolerance at around -38dBm.

© 2001 Consumer Microcircuits Limited

8

D/673/5

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