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AD7747 Datenblatt(PDF) 19 Page - Analog Devices

Teilenummer AD7747
Bauteilbeschribung  24-Bit Capacitance-to-Digital Converter
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
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AD7747
Rev. 0 | Page 18 of 28
CONFIGURATION REGISTER
Address Pointer 0x0A, Default Value 0xA0
Converter update rate and mode of operation setup.
Table 17. Configuration Register Bit Map
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Mnemonic
VTFS1
VTFS0
CAPFS2
CAPFS1
CAPFS0
MD2
MD1
MD0
Default
0
0
0
0
0
0
0
0
Table 18.
Bit
Mnemonic
Description
Voltage/temperature channel digital filter setup—conversion time/update rate setup.
VTCHOP = 1
VTFS1
VTFS0
Conversion Time (ms)
Update Rate (Hz)
−3 dB Frequency (Hz)
0
0
20.1
49.8
26.4
0
1
32.1
31.2
15.9
1
0
62.1
16.1
8.0
7
6
VTFS1
VTFS0
1
1
122.1
8.2
4.0
Capacitive channel digital filter setup—conversion time/update rate setup.
CAPFS2
CAPFS1
CAPFS0
Conversion Time (ms)
Update Rate
−3 dB Frequency (Hz)
0
0
0
22.0
45.5
43.6
0
0
1
23.9
41.9
39.5
0
1
0
40.0
25.0
21.8
0
1
1
76.0
13.2
10.9
1
0
0
124.0
8.1
6.9
1
0
1
154.0
6.5
5.3
1
1
0
184.0
5.5
4.4
5
4
3
CAPFS2
CAPFS1
CAPFS0
1
1
1
219.3
4.6
4.0
Converter mode of operation setup.
MD2
MD1
MD0
Mode
0
0
0
Idle
0
0
1
Continuous conversion
0
1
0
Single conversion
0
1
1
Power-down
1
0
0
1
0
1
Capacitance system offset calibration
1
1
0
Capacitance or voltage system gain calibration
2
1
0
MD2
MD1
MD0
1
1
1


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