MX641 查看數據表（PDF） - CML Microsystems Plc
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MX641 Datasheet PDF : 17 Pages
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Dual SPM Detector
Page 10 of 16
MX641 Preliminary Information
4.3.1.2 German FTZ Specification (16kHz)
The FTZ system has a Must Decode level of -21dB (ref.) and a Must-Not Decode level of -27dB (ref.).
Reference to
Table 4 shows that Bandpass Filter Gain settings of 5dB, 6dB or 7dB will enable an MX641 channel to meet
this level specification. Figure 5 illustrates the range of these various settings.
To meet the German FTZ specification, the input data (D5 to D0) must be:
00101
0
5.0dB
or
00110
0
6.0dB
or
00111
0
7.0dB
Note:
1. By selecting the middle setting, the greatest noise immunity is achieved.
MUST DECODE
-21dB(ref.)
-21.9
-23.2
WILL DECODE
-22.9
5.0dB
-24.5
-24.2 6.0dB
-25.5
WILL-NOT DECODE
MUST-NOT DECODE
-23.9
-25.2 7.0dB
-26.5
-27dB(ref.)
Figure 5: German Specification - Possible Settings
4.3.1.3 French Specification (12kHz)
This system has a Must Decode level of -17.36dB (ref.) and a Must-Not Decode level of -23.8dB (ref.).
Reference to
Table 4 shows that Bandpass Filter Gain settings of 2dB, 3dB or 4dB will enable an MX641 channel to meet
this level specification. Figure 6 illustrates the range of these various settings.
To meet the French SPM specification, the input data (D5 to D0) must be:
00010
1
2.0dB
or
00011
1
3.0dB
or
00100
1
4.0dB
Note:
1. By selecting the middle setting, the greatest noise immunity is achieved.
MUST DECODE
-17.36dB(ref.)
-18.2
-19.5
WILL DECODE
-19.2
2.0dB
-20.8
-20.5 3.0dB
-21.8
WILL-NOT DECODE
-20.2
-21.5 4.0dB
-22.8
MUST-NOT DECODE
-23.8dB(ref.)
Figure 6: French Specifications - Possible Settings
ã2001 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480115.004
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
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