CMX868 データシートの表示（PDF） - CML Microcircuits

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CMX868

Low Power V.22 bis Modem

CML Microcircuits 

Low Power V.22 bis Modem

CMX868

4-Wire Line Interface

Figure 4b shows a simplified interface for use with a 600Ω 4-wire line. The line terminations are provided

by R10 and R13, the values of which are dependent on the choice of transformer; see notes above. High

frequency noise is attenuated by C11 while R11 and R12 set the receive signal level into the modem.

Transmit and receive line level settings and the value of R11 are as for the 2-wire circuit.

R10, 13

R11

R12

See text

See text

100kΩ

C3

See Figure 2

C11

100pF

C12

33nF

Resistors ±5%, capacitors ±20%

Figure 4b 4-Wire Line Interface Circuit

© 2004 CML Microsystems Plc

9

D/868/9

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