CMX673 参数 Datasheet PDF下载

1.6

1.6.1

Application Notes

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

X1

C2

1

8

R5

XTALN

2

7

VREF

R3

R2

CMX673P1

ENABLE

Cµ m r F/ oT

o

3

6

_

DETECT

R1

C3

R4

Phone

Line

4

5

SIGIN

+

C4

Figure 3 A typical Telephone Line Circuit Application

R1

R2

R3

R4

470kΩ

470kΩ

240kΩ

470kΩ

R5

C3

C4

160kΩ

0.01µF 250V

0.01µF 250V

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

R2

R3

R4

499kΩ

499kΩ

54.9kΩ

499kΩ

R5

C3

C4

49.9kΩ

0.001µF 300V

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