CMX641A Просмотр технического описания (PDF) - MX-COM Inc
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CMX641A Datasheet PDF : 23 Pages
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Dual SPM/Security Detector/Generator
10 of 23
CMX641A Advance Information
4.2.1.1.1 Controlled Sensitivity Mode (PRESET LEVEL pin = logic ‘0’)
This mode allows the sensitivity to be set from a µController via a 6-bit serial data input. This same serial
input also sets operation (bit 0) for either 12kHz or 16kHz systems. Both channels are set identically.
Seria
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
Bandpass
Filter Gain
(dB)
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0
19.0
20.0
21.0
22.0
23.0
24.0
25.0
26.0
27.0
12kHz System Bit D0 = ‘1’
Minimum
Sensitivity
dB(ref.)
Nominal
Sensitivity
dB(ref.)
Maximum
Sensitivity
dB(ref.)
-16.2
-17.5
-18.8
-17.2
-18.5
-19.8
-18.2
-19.5
-20.8
-19.2
-20.5
-21.8
-20.2
-21.5
-22.8
-21.2
-22.5
-23.8
-22.2
-23.5
-24.8
-23.2
-24.5
-25.8
-24.2
-25.5
-26.8
-25.2
-26.5
-27.8
-26.2
-27.5
-28.8
-27.2
-28.5
-29.8
-28.2
-29.5
-30.8
-29.2
-30.5
-31.8
-30.2
-31.5
-32.8
-31.2
-32.5
-33.8
-32.2
-33.5
-34.8
-33.2
-34.5
-35.8
-34.2
-35.5
-36.8
-35.2
-36.5
-37.8
-36.2
-37.5
-38.8
-37.2
-38.5
-39.8
-38.2
-39.5
-40.8
-39.2
-40.5
-41.8
-40.2
-41.5
-42.8
-41.2
-42.5
-43.8
-42.2
-43.5
-44.8
-43.2
-44.5
-45.8
16kHz System Bit D0 = ‘0’
Minimum
Sensitivity
dB(ref.)
Nominal
Sensitivity
dB(ref.)
Maximum
Sensitivity
dB(ref.)
-16.9
-17.9
-18.9
-19.9
-20.9
-21.9
-22.9
-23.9
-24.9
-25.9
-26.9
-27.9
-28.9
-29.9
-30.9
-31.9
-32.9
-33.9
-34.9
-35.9
-36.9
-37.9
-38.9
-39.9
-40.9
-41.9
-42.9
-43.9
-18.2
-19.2
-20.2
-21.2
-22.2
-23.2
-24.2
-25.2
-26.2
-27.2
-28.2
-29.2
-30.2
-31.2
-32.2
-33.2
-34.2
-35.2
-36.2
-37.2
-38.2
-39.2
-40.2
-41.2
-42.2
-43.2
-44.2
-45.2
-19.5
-20.5
-21.5
-22.5
-23.5
-24.5
-25.5
-26.5
-27.5
-28.5
-29.5
-30.5
-31.5
-32.5
-33.5
-34.5
-35.5
-36.5
-37.5
-38.5
-39.5
-40.5
-41.5
-42.5
-43.5
-44.5
-45.5
-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 the external components be selected to set the Input Amp gain to a higher figure.
Table 3: Controlled Sensitivity Setting Information in Fixed Bandwidth Operating State
The figures in Table 3 assume:
The recommended amplifier components (see Figure 2) are employed.
The applied VDD is 5.0V. 0dB(ref.) = 775Vrms.
ã2001 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480227.002
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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