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CMX661

PAIR GAIN DUAL SPM DETECTOR

CML Microsystems Plc 

Pair Gain Dual SPM Detector

CMX661

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

External components are necessary to generate the bias voltage for the input op-amps. (The voltage

labelled VBIAS in Figure 3). This could be a potential divider consisting of two 15kΩ resistors and a 1.0µF

capacitor to decouple the output.

1.6.2 Crystal/Clock Distribution

The CMX661 requires a 3.579545MHz crystal. With the exception of the crystal, all oscillator

components are incorporated on chip.

1.6.3 Channel 1 and Channel 2 Output Format

Figure 4 illustrates the output format, which is the same for both channels.

Figure 4 Detector Output Format

© 2002 CML Microsystems Plc

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D/661/3

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