參數(shù)資料
型號: AD7746ARUZ
廠商: Analog Devices Inc
文件頁數(shù): 8/28頁
文件大?。?/td> 0K
描述: IC CONV 2CH CAP TO DGTL 16-TSSOP
設(shè)計(jì)資源: Extending the Capacitive Input Range of AD7745/AD7746 (CN0129)
標(biāo)準(zhǔn)包裝: 96
類型: 電容數(shù)字轉(zhuǎn)換器
分辨率(位): 24 b
數(shù)據(jù)接口: 串行
電壓電源: 單電源
電源電壓: 2.7 V ~ 5.25 V
工作溫度: -40°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: 16-TSSOP(0.173",4.40mm 寬)
供應(yīng)商設(shè)備封裝: 16-TSSOP
包裝: 管件
產(chǎn)品目錄頁面: 781 (CN2011-ZH PDF)
配用: EVAL-AD7746EBZ-ND - BOARD EVALUATION FOR AD7746
AD7745/AD7746
Rev. 0 | Page 16 of 28
CAP SET-UP REGISTER
Address Pointer 0x07, Default Value 0x00
Capacitive channel setup.
Table 11. CAP Set-Up Register Bit Map
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Mnemonic
CAPEN
CIN2
CAPDIFF
-
CAPCHOP
Default
0
Table 12.
Bit
Mnemonic
Description
7
CAPEN
CAPEN = 1 enables capacitive channel for single conversion, continuous conversion, or calibration.
6
CIN2
CIN2 = 1 switches the internal multiplexer to the second capacitive input on the AD7746.
5
CAPDIFF
DIFF = 1 sets differential mode on the selected capacitive input.
4-1
-
These bits must be 0 for proper operation.
0
CAPCHOP
The CAPCHOP bit should be set to 0 for the specified capacitive channel performance.
CAPCHOP = 1 approximately doubles the capacitive channel conversion times and slightly improves the
capacitive channel noise performance for the longest conversion times.
VT SET-UP REGISTER
Address Pointer 0x08, Default Value 0x00
Voltage/Temperature channel setup.
Table 13. VT Set-Up Register Bit Map
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Mnemonic
VTEN
VTMD1
VTMD0
EXTREF
-
VTSHORT
VTCHOP
Default
0
Table 14.
Bit
Mnemonic
Description
7
VTEN
VTEN = 1 enables voltage/temperature channel for single conversion, continuous conversion, or calibration.
Voltage/temperature channel input configuration.
VTMD1
VTMD0
Channel Input
0
Internal temperature sensor
0
1
External temperature sensor diode
1
0
VDD monitor
6
5
VTMD1
VTMD0
1
External voltage input (VIN)
4
EXTREF
EXTREF = 1 selects an external reference voltage connected to REFIN(+), REFIN(–) for the voltage input or the
VDD monitor.
EXTREF = 0 selects the on-chip internal reference. The internal reference must be used with the internal
temperature sensor for proper operation.
3-2
-
These bits must be 0 for proper operation.
1
VTSHORT
VTSHORT = 1 internally shorts the voltage/temperature channel input for test purposes.
0
VTCHOP = 1
VTCHOP = 1 sets internal chopping on the voltage/temperature channel.
The VTCHOP bit must be set to 1 for the specified voltage/temperature channel performance.
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