参数资料
型号: AD7745ARUZ-REEL
厂商: Analog Devices Inc
文件页数: 11/28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: 2,500
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: 带卷 (TR)
AD7745/AD7746
Rev. 0| Page 19 of 28
CAP DAC A REGISTER
Address Pointer 0x0B, Default Value 0x00
Capacitive DAC setup.
Table 19. Cap DAC A Register Bit Map
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Mnemonic
DACAENA
DACA—7-Bit Value
Default
0
0x00
Table 20.
Bit
Mnemonic
Description
7
DACAENA
DACAENA = 1 connects capacitive DACA to the positive capacitance input.
6-1
DACA
DACA value, Code 0x00
≈ 0 pF, Code 0x7F ≈ full range.
CAP DAC B REGISTER
Address Pointer 0x0C, Default Value 0x00
Capacitive DAC setup.
Table 21. Cap DAC B Register Bit Map
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Mnemonic
DACBENB
DACB—7-bit value
Default
0
0x00
Table 22.
Bit
Mnemonic
Description
7
DACBENB
DACBENB = 1 connects capacitive DACB to the negative capacitance input.
6-1
DACB
DACB value, Code 0x00
≈ 0 pF, Code 0x7F ≈ full range.
CAP OFFSET CALIBRATION REGISTER
16 Bits, Address Pointer 0x0D, 0x0E,
Default Value 0x8000
The capacitive offset calibration register holds the capacitive
channel zero-scale calibration coefficient. The coefficient is
used to digitally remove the capacitive channel offset. The
register value is updated automatically following the execution
of a capacitance offset calibration. The capacitive offset calibra-
tion resolution (cap offset register LSB) is less than 32 aF; the
full range is 1 pF.
On the AD7746, the register is shared by the two capacitive
channels. If the capacitive channels need to be offset-calibrated
individually, the host controller software should read the
AD7746 capacitive offset calibration register values after
performing the offset calibration on individual channels and
then reload the values back to the AD7746 before executing
conversion on a different channel.
CAP GAIN CALIBRATION REGISTER
16 Bits, Address Pointer 0x0F, 0x10,
Default Value 0xXXXX
Capacitive gain calibration register. The register holds the
capacitive channel full-scale factory calibration coefficient.
On the AD7746, the register is shared by the two capacitive
channels.
VOLT GAIN CALIBRATION REGISTER
16 Bits, Address Pointer 0x11,0x12,
Default Value 0xXXXX
Voltage gain calibration register. The register holds the voltage
channel full-scale factory calibration coefficient.
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