参数资料
| 型号： | AD8226BRZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 17/28页 |
| 文件大小： | 0K |
| 描述： | IC INSTR AMP RRO +/-18 8SOIC |
| 标准包装： | 2,500 |
| 放大器类型： | 仪表 |
| 电路数： | 1 |
| 输出类型： | 满摆幅 |
| 转换速率： | 0.6 V/µs |
| -3db带宽： | 1.5MHz |
| 电流 - 输入偏压： | 20nA |
| 电压 - 输入偏移： | 100µV |
| 电流 - 电源： | 350µA |
| 电流 - 输出 / 通道： | 13mA |
| 电压 - 电源，单路/双路(±)： | 2.2 V ~ 36 V，±1.35 V ~ 18 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 带卷 (TR) |
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AD8226
Data Sheet
Rev. C | Page 24 of 28
PRECISION STRAIN GAGE
The low offset and high CMRR over frequency of the AD8226
make it an excellent candidate for performing bridge measure-
ments. The bridge can be connected directly to the inputs of the
amplifier (see Figure 65).
5V
2.5V
10F
0.1F
AD8226
+IN
–IN
RG
350
+
–
07036-
010
Figure 65. Precision Strain Gage
DRIVING AN ADC
Figure 66 shows several methods for driving an ADC. The
ADuC7026 microcontroller was chosen for this example because it
contains ADCs with an unbuffered, charge-sampling architecture
that is typical of most modern ADCs. This type of architecture
typically requires an RC buffer stage between the ADC and
amplifier to work correctly.
Option 1 shows the minimum configuration required to drive
a charge-sampling ADC. The capacitor provides charge to the
ADC sampling capacitor while the resistor shields the AD8226
from the capacitance. To keep the AD8226 stable, the RC time
constant of the resistor and capacitor needs to stay above 5 s.
This circuit is mainly useful for lower frequency signals.
Option 2 shows a circuit for driving higher speed signals. It uses a
precision op amp (AD8616) with relatively high bandwidth and
output drive. This amplifier can drive a resistor and capacitor with
a much higher time constant and is therefore suited for higher
frequency applications.
Option 3 is useful for applications where the AD8226 needs to
run off a large voltage supply but drive a single-supply ADC.
In normal operation, the AD8226 output stays within the ADC
range, and the AD8616 simply buffers it. However, in a fault
condition, the output of the AD8226 may go outside the supply
range of both the AD8616 and the ADC. This is not an issue in
the circuit, however, because the 10 kΩ resistor between the two
amplifiers limits the current into the AD8616 to a safe level.
AD8226
REF
100nF
100
10k
10
10nF
ADC0
ADC1
ADC2
AGND
3.3V
OPTION 1: DRIVING LOW FREQUENCY SIGNALS
OPTION 2: DRIVING HIGH FREQUENCY SIGNALS
OPTION 3: PROTECTING ADC FROM LARGE VOLTAGES
3.3V
AD8226
AD8616
ADuC7026
REF
3.3V
10
10nF
AD8226
AD8616
REF
+15V
–15V
AVDD
07036-
065
Figure 66. Driving an ADC
相关PDF资料 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8226CRMZ | 制造商:AD 制造商全称:Analog Devices 功能描述:Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier |
| AD8226CRMZ-R7 | 制造商:AD 制造商全称:Analog Devices 功能描述:Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier |
| AD8226CRMZ-RL | 制造商:AD 制造商全称:Analog Devices 功能描述:Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier |
| AD8226CRZ | 制造商:AD 制造商全称:Analog Devices 功能描述:Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier |
| AD8226CRZ-R7 | 制造商:AD 制造商全称:Analog Devices 功能描述:Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier |
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