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AD8295 Datasheet(PDF) 16 Page - Analog Devices |
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AD8295 Datasheet(HTML) 16 Page - Analog Devices |
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16 / 20 page  AD8426 Preliminary Technical Data Rev. PrD | Page 16 of 20 PRECISION STRAIN GAGE The low offset and high CMRR over frequency of the AD8426 make it an excellent candidate for bridge measurements. The bridge can be connected directly to the inputs of the amplifier (see Figure 15). 5V 2.5V 10µF 0.1µF AD8426 +IN –IN RG 350Ω 350Ω 350Ω 350Ω + – Figure 15. Precision Strain Gage DRIVING AN ADC Figure 16 shows several different methods of driving an ADC. The ADC in the ADuC7026 microcontroller was chosen for this example because it has 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 the 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, and the resistor shields the AD8426 from the capacitance. To keep the AD8426 stable, the RC time constant of the resistor and capacitor needs to stay above 5 μs. This circuit is mainly useful for lower frequency signals. Option 2 shows a circuit for driving higher frequency signals. It uses a precision op amp (AD8616) with relatively high band- width 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 AD8426 needs to run off a large voltage supply, but drives a single supply ADC. In normal operation, the AD8426 output stays within the ADC range, and the AD8616 simply buffers it. However, in a fault condition, the output of the AD8426 may go outside the supply range of both the AD8616 and the ADC. This is not an issue in this circuit, because the 10 kΩ resistor between the two amplifiers limits the current into the AD8616 to a safe level. AD8426 REF 100nF 100Ω 10kΩ 10Ω 10nF ADC0 ADC1 ADC2 AGND 3.3V 3.3V 3.3V OPTION 1: DRIVING LOW FREQUENCY SIGNALS OPTION 2: DRIVING HIGH FREQUENCY SIGNALS OPTION 3: PROTECTING ADC FROM LARGE VOLTAGES 3.3V AD8426 AD8616 ADuC7026 REF 3.3V 10Ω 10nF AD8426 AD8616 REF +15V –15V AVDD Figure 16. Driving an ADC |
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