MX641DW Просмотр технического описания (PDF) - MX-COM Inc
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MX641DW Datasheet PDF : 16 Pages
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Dual SPM Detector
9
MX641 PRELIMINARY INFORMATION
4.3.1.1 Controlled Sensitivity Setting Information
The sensitivity figures in Table 4 are based on the following:
1. The recommended amplifier components (see Figure 2) are used, providing an amplifier gain at 16kHz
of 19.8dB ±0.3dB or at 12kHz of 19.1dB ±0.3dB.
2. A comparator sensitivity of 1.6dB(ref.) ±1dB (the variation is due to filter gain error, filter output offset, comparator
input offset or a combination of all 3).
3. The applied VDD is 5.0 volts; 0dB (ref.) = 775mVRMS.
Serial Data
Bits
D5 - D1
00000
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
01011
01100
01101
01110
01111
10000
10001
10010
10011
10100
10101
10110
10111
11000
11001
11010
11011
11100
11101
11110
11111
12kHz System
Bit D0 = ‘1’
16kHz System
Bit D0 = ‘0’
Bandpass Minimum Nominal Maximum Minimum Nominal Maximum
Filter Gain Sensitivity Sensitivity Sensitivity Sensitivity Sensitivity Sensitivity
(dB)
dB(ref.)
dB(ref.)
dB(ref.)
dB(ref.)
dB(ref.)
dB(ref.)
0
-16.2
-17.5
-18.8
-16.9
-18.2
-19.5
1.0
-17.2
-18.5
-19.8
-17.9
-19.2
-20.5
2.0
-18.2
-19.5
-20.8
-18.9
-20.2
-21.5
3.0
-19.2
-20.5
-21.8
-19.9
-21.2
-22.5
4.0
-20.2
-21.5
-22.8
-20.9
-22.2
-23.5
5.0
-21.2
-22.5
-23.8
-21.9
-23.2
-24.5
6.0
-22.2
-23.5
-24.8
-22.9
-24.2
-25.5
7.0
-23.2
-24.5
-25.8
-23.9
-25.2
-26.5
8.0
-24.2
-25.5
-26.8
-24.9
-26.2
-27.5
9.0
-25.2
-26.5
-27.8
-25.9
-27.2
-28.5
10.0
-26.2
-27.5
-28.8
-26.9
-28.2
-29.5
11.0
-27.2
-28.5
-29.8
-27.9
-29.2
-30.5
12.0
-28.2
-29.5
-30.8
-28.9
-30.2
-31.5
13.0
-29.2
-30.5
-31.8
-29.9
-31.2
-32.5
14.0
-30.2
-31.5
-32.8
-30.9
-32.2
-33.5
15.0
-31.2
-32.5
-33.8
-31.9
-33.2
-34.5
16.0
-32.2
-33.5
-34.8
-32.9
-34.2
-35.5
17.0
-33.2
-34.5
-35.8
-33.9
-35.2
-36.5
18.0
-34.2
-35.5
-36.8
-34.9
-36.2
-37.5
19.0
-35.2
-36.5
-37.8
-35.9
-37.2
-38.5
20.0
-36.2
-37.5
-38.8
-36.9
-38.2
-39.5
21.0
-37.2
-38.5
-39.8
-37.9
-39.2
-40.5
22.0
-38.2
-39.5
-40.8
-38.9
-40.2
-41.5
23.0
-39.2
-40.5
-41.8
-39.9
-41.2
-42.5
24.0
-40.2
-41.5
-42.8
-40.9
-42.2
-43.5
25.0
-41.2
-42.5
-43.8
-41.9
-43.2
-44.5
26.0
-42.2
-43.5
-44.8
-42.9
-44.2
-45.5
27.0
-43.2
-44.5
-45.8
-43.9
-45.2
-46.5
These states should never be used. If sensitivities of this order are required (e.g. the Swedish
Rural SPM specification), it is recommended that the Controlled Sensitivity setting be set to 20dB
(10100) and external components selected to set the Input Amp gain to a higher figure. This
action will prevent falsing by sub-harmonic frequencies.
Table 4: Controlled Sensitivity Setting Information
© 1998 MXxCOM Inc.
www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054
Doc. # 20480115.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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