參數(shù)資料
型號: AD7746ARUZ-REEL
廠商: Analog Devices Inc
文件頁數(shù): 9/28頁
文件大小: 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: 2,500
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: 帶卷 (TR)
配用: EVAL-AD7746EBZ-ND - BOARD EVALUATION FOR AD7746
AD7745/AD7746
Rev. 0| Page 17 of 28
EXC SET-UP REGISTER
Address Pointer 0x09, Default Value 0x03
Capacitive channel excitation setup.
Table 15. EXC Set-Up Bit Map
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Mnemonic
CLKCTRL
EXCON
EXCB
EXCA
EXCLVL1
EXCLVL0
Default
0
Table 16.
Bit
Mnemonic
Description
7
CLKCTRL
The CLKCTRL bit should be set to 0 for the specified AD7745/AD7746 performance.
CLKCTRL = 1 decreases the excitation signal frequency and the modulator clock frequency by factor of 2.
This also increases the conversion time on all channels (capacitive, voltage, and temperature) by a factor of 2.
6
EXCON
When EXCON = 0, the excitation signal is present on the output only during capacitance channel conversion.
When EXCON = 1, the excitation signal is present on the output during both capacitance and
voltage/temperature conversion.
5
EXCB
EXCB = 1 enables EXCB pin as the excitation output.
4
EXCB
EXCB = 1 enables EXCB pin as the inverted excitation output.
Only one of the EXCB or the EXCB bits should be set for proper operation.
3
EXCA
EXCA = 1 enables EXCA pin as the excitation output.
2
EXCA
EXCA = 1 enables EXCA pin as the inverted excitation output.
Only one of the EXCA or the EXCA bits should be set for proper operation.
Excitation Voltage Level.
EXCLVL1
EXCLVL0
Voltage on Cap
EXC Pin Low Level
EXC Pin High Level
0
±VDD/8
VDD × 3/8
VDD × 5/8
0
1
±VDD/4
VDD × 1/4
VDD × 3/4
1
0
±VDD × 3/8
VDD × 1/8
VDD × 7/8
1
0
EXCLVL1,
EXCLVL0
1
±VDD/2
0
VDD
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