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参数资料
型号： AD7710ARZ-REEL
厂商： Analog Devices Inc
文件页数： 20/32页
文件大小： 0K
描述： IC ADC 24BIT DIFF INP 24-SOIC
标准包装： 1,000
位数： 24
采样率（每秒）： 1.03k
数据接口： 串行
转换器数目： 1
功率耗散（最大）： 45mW
电压电源： 模拟和数字，双 ±
工作温度： -40°C ~ 85°C
安装类型： 表面贴装
封装/外壳： 24-SOIC（0.295"，7.50mm 宽）
供应商设备封装： 24-SOIC W
包装： 带卷 (TR)
输入数目和类型： 2 个差分，单极；2 个差分，双极
AD7710
REV. G
–27–
CLOCK
GENERATION
SERIAL INTERFACE
CONTROL
REGISTER
OUTPUT
REGISTER
CHARGE-BALANCING A/D
CONVERTER
DIGITAL
FILTER
AD7710
M
U
X
PGA
AGND
DGND
MODE SDATA SCLK
A0
MCLK
OUT
MCLK
I
AIN1(+)
AIN1(–)
REF
IN(–)
REF
IN(+)
SYNC
A = 1 – 128
DRDY
TFS
RFS
AIN2(+)
AIN2(–)
VSS
VBIAS
AVDD
DVDD
2.5V
REFERENCE
REF
OUT
ANALOG
5V SUPPLY
R
ACTIVE
GAGE
DUMMY
GAGE
N
AUTO-ZEROED
Σ-
MODULATOR
Figure 19. Strain-Gage Application with the AD7710
CLOCK
GENERATION
SERIAL INTERFACE
CONTROL
REGISTER
OUTPUT
REGISTER
CHARGE-BALANCING A/D
CONVERTER
AUTO-ZEROED
Σ-
MODULATOR
DIGITAL
FILTER
AD7710
M
U
X
PGA
AGND
DGND
MODE SDATA SCLK
A0
MCLK
OUT
MCLK
IN
AIN1(+)
AIN1(–)
SYNC
A = 1 – 128
DRDY
TFS
RFS
AIN2(+)
AIN2(–)
VSS
VBIAS
AVDD
DVDD
2.5V
REFERENCE
R
ACTIVE
GAGE
DUMMY
GAGE
DIGITAL
5V SUPPLY
ANALOG SUPPLY
EXCITATION
CURRENT
REF IN(+)
R =
VREF
IEXCITATION
REF IN(–)
REF
OUT
Figure 20. Alternate Scheme for Generating AD7710 Reference Voltage
APPLICATIONS
Figure 19 shows a strain gage interfaced directly to one of the
analog input channels of the AD7710. The differential inputs to
the AD7710 are connected directly to the bridge network of the
strain gage. In the diagram shown, the on-chip reference of the
AD7710 provides the voltage for the bridge network and also
provides the reference voltage for the AD7710. An alternative
scheme, outlined in Figure 20, shows the analog positive supply
voltage powering the bridge network and the AD7710, with the
reference voltage for the AD7710 generated across a resistor
that is placed in series with the bridge network. In this case, the
value of the reference resistor is determined by the required
reference voltage divided by the value of the excitation current.
The on-chip PGA allows the AD7710 to handle an analog input
voltage range as low as 20 mV full scale. The differential inputs
of the part allow this analog input range to have an absolute
value anywhere between VSS and AVDD.
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