CMX867D2 CML Microcircuits, CMX867D2 Datasheet - Page 5

• Manufacturer Part Number: CMX867D2
• Description: Low power V.22 modem
• Manufacturer: CML Microcircuits

Low Power V.22 Modem
1.4
This device is capable of detecting and decoding small amplitude signals. To achieve this V
V
recommended that the printed circuit board is laid out with a V
provide a low impedance connection between the V
The V
preferably be part of the V
For best results, an Xtal oscillator design should drive the clock inverter input with signal levels of at least
40% of V
oscillator design assistance, please consult your Xtal manufacturer.
BIAS
2001 Consumer Microcircuits Limited
SS
should be decoupled and the receive path protected from extraneous in-band signals. It is
Notes:
External Components
DD
connections to the Xtal oscillator capacitors C1 and C2 should also be low impedance and
I/P
O/P
BI
T/S
NC
peak-to-peak. Tuning-fork Xtals generally cannot meet this requirement. To obtain Xtal
Figure 2 Recommended External Components for Typical Application
R1
X1
=
=
=
=
=
Resistors 5%, capacitors 20% unless otherwise stated.
Input
Output
Bidirectional
3-state Output
No Connection
SS
ground plane to ensure reliable start up of the oscillator.
100k
11.0592MHz
or 12.288MHz
SS
5
pins and the V
SS
C1, C2
C3, C4
C5
ground plane in the CMX867 area to
DD
and V
BIAS
22pF
100nF
10uF
decoupling capacitors.
DD
CMX867
D/867/2
and