CMX641AP4 View Datasheet(PDF) - CML Microsystems Plc
Part Name
Description
MFG CO.
'CMX641AP4' PDF : 26 Pages View PDF
Dual SPM/Security Detector/Generator
CMX641A
1.6 Application Notes
1.6.1 Signal Input Configurations
Figure 3 shows how the input amplifiers can be connected as differential mode or common mode
amplifiers, according to the application.
Figure 3 Example Input Configurations
1.6.2 Crystal/Clock Distribution
The CMX641A requires a 3.579545MHz crystal or an external clock pulse input. With the exception of
the crystal, all oscillator components are incorporated on chip. If a crystal is employed, the Clock Out pin
should be connected directly to the Clock In pin.
To reduce component and layout complexity the clock requirements of up to 3 additional CMX641A
microcircuits may be supplied from a crystal driven CMX641A acting as the master system clock. With
reference to Figure 4, the clock should be distributed as illustrated and the XTAL pins of the driven
devices should be connected directly to VDD.
Note that the maximum load on the master Clock Out pin should not be exceeded.
Figure 4 Example of Clock Distribution and 8-Channel Output Multiplexing
1.6.3 Channel 1 and Channel 2 Output Format
Figure 5 illustrates the two output formats: Tone Follower mode and Packet mode.
© 2002 Consumer Microcircuits Limited
15
D/641A/5
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