CMX867(2000) Просмотр технического описания (PDF) - CML Microsystems Plc

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Компоненты Описание

производитель

CMX867
(Rev.:2000)

Low Power V.22 Modem

CML Microsystems Plc 

Low Power V.22 Modem

Notes:

I/P

=

O/P =

BI

=

T/S =

NC =

Input

Output

Bidirectional

3-state Output

No Connection

1.4 External Components

CMX867

R1

100kΩ

X1

11.0592MHz

or 12.288MHz

C1, C2

C3, C4

C5

22pF

100nF

10uF

Resistors ±5%, capacitors ±20% unless otherwise stated.

Figure 2 Recommended External Components for Typical Application

This device is capable of detecting and decoding small amplitude signals. To achieve this VDD and VBIAS

should be decoupled and the receive path protected from extraneous in-band signals. It is recommended that

the printed circuit board is laid out with a VSS ground plane in the CMX867 area to provide a low impedance

connection between the VSS pins and the VDD and VBIAS decoupling capacitors. The VSS connections to the

Xtal oscillator capacitors C1 and C2 should also be low impedance and preferably be part of the VSS ground

plane to ensure reliable start up of the oscillator.

For best results, an Xtal oscillator design should drive the clock inverter input with signal levels of at least 40%

of VDD peak-to-peak. Tuning-fork Xtals generally cannot meet this requirement. To obtain Xtal oscillator

design assistance, please consult your Xtal manufacturer.

© 2000 Consumer Microcircuits Limited

5

D/867/1

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