参数资料
型号: AD7745ARUZ
厂商: Analog Devices Inc
文件页数: 9/28页
文件大小: 0K
描述: IC CONV 1CH CAP TO DGTL 16TSSOP
设计资源: Extending the Capacitive Input Range of AD7745/AD7746 (CN0129)
标准包装: 96
类型: 电容数字转换器
分辨率(位): 24 b
数据接口: 串行
电压电源: 单电源
电源电压: 2.7 V ~ 5.25 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 16-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 16-TSSOP
包装: 管件
产品目录页面: 781 (CN2011-ZH PDF)
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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