CMX661 查看數據表（PDF） - CML Microsystems Plc
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CMX661 Datasheet PDF : 16 Pages
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Pair Gain Dual SPM Detector
CMX661
Will Detect and Will Not Detect Bandwidths
There are four selectable bandwidths which are common to both channels. The ‘will detect’ bandwidth
can be programmed to ±1.5%, ±3%, ±5% or ±7.5%. The corresponding ‘will not detect’ band edges are
±4%, ±5.5%, ±7.5% and ±10%. Pins D0 and D1 program the bandwidth selection, shared by both
channels, as shown in Tables 4 and 5.
D0-D1
(both channels)
00
01
10
11
Lower
Will Not Detect
11.52kHz (-4.0%)
11.34kHz (-5.5%)
11.10kHz (-7.5%)
10.80kHz (-10.0%)
Lower
Will Detect
11.82kHz (-1.5%)
11.64kHz (-3.0%)
11.40kHz (-5.0%)
11.10kHz (-7.5%)
Upper
Will Detect
12.18kHz (+1.5%)
12.36kHz (+3.0%)
12.60kHz (+5.0%)
12.90kHz (+7.5%)
Upper
Will Not Detect
12.48kHz (+4.0%)
12.66kHz (+5.5%)
12.90kHz (+7.5%)
13.20kHz (+10.0%)
Table 4 Setting 12kHz Will Detect/Will Not Detect Bandwidths
D0-D1
(both channels)
00
01
10
11
Lower
Will Not Detect
15.36kHz (-4.0%)
15.12kHz (-5.5%)
14.80kHz (-7.5%)
14.40kHz (-10.0%)
Lower
Will Detect
15.76kHz (-1.5%)
15.52kHz (-3.0%)
15.20kHz (-5.0%)
14.80kHz (-7.5%)
Upper
Will Detect
16.24kHz (+1.5%)
16.48kHz (+3.0%)
16.80kHz (+5.0%)
17.20kHz (+7.5%)
Upper
Will Not Detect
16.64kHz (+4.0%)
16.88kHz (+5.5%)
17.20kHz (+7.5%)
17.60kHz (+10.0%)
Table 5 Setting 16kHz Will Detect/Will Not Detect Bandwidths
The CMX661 will always respond to valid inputs between the Lower ‘Will Detect’ and Upper ‘Will Detect’
frequencies inclusive. It will not respond to frequencies at or below the Lower ‘Will Not Detect’ or at or
above the Upper ‘Will Not Detect’.
System Select
The System Select pin selects the operating frequencies of the CMX661 (logic '1' = 12kHz, logic '0' =
16kHz).
© 2002 CML Microsystems Plc
8
D/661/3
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