CMX654 Просмотр технического описания (PDF) - CML Microcircuits
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CMX654 Datasheet PDF : 13 Pages
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V.23 Transmit Modulator
1.4 External Components
CMX654
R1
100kΩ
X1
3.579545MHz
C1, C2
C3
C4
18pF
0.1µF
0.1µF
Resistors ±5%, capacitors ±10% unless otherwise stated.
Figure 2 Recommended External Components for Typical Application
1.5 General Description
1.5.1 Xtal Osc and Clock Dividers
Frequency and timing accuracy of the CMX654 is determined by a 3.579545MHz clock present at the
XTAL/CLOCK pin. This may be generated by the on-chip oscillator inverter using the external components C1,
C2 and X1 of Figure 2, or may be supplied from an external source to the XTAL/CLOCK input. If supplied from
an external source, C1, C2 and X1 should not be fitted.
The on-chip oscillator is turned off in the 'Zero-Power' mode.
If the clock is provided by an external source which is not always running, then the 'Zero-Power' mode must be
set when the clock is not available. Failure to observe this rule may cause a significant rise in the supply
current drawn by CMX654 as well as generating undefined states of the RDYN output.
© 1998 Consumer Microcircuits Limited
5
D/654/3
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