Datasheet > AD8227ARMZ-RL1

AD8227ARMZ-RL1

更新时间： 2022-02-26 09:27:43

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
25页	539K
描述
Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier

阅读下载

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

AD8227ARMZ-RL1 数据手册

AD8227

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.

DRIVING AN ADC

Figure 66 shows several different methods for 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 3 is useful for applications where the AD8227 needs to

run off a large voltage supply but drives a single-supply ADC.

In normal operation, the AD8227 output stays within the ADC

range, and the AD8616 simply buffers it. However, in a fault

condition, the output of the AD8227 may go outside the supply

range of both the AD8616 and the ADC. This is not an issue in

the circuit, because the 10 kΩ resistor between the two amplifiers

limits the current into the AD8616 to a safe level.

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 AD8227

from the capacitance. To keep the AD8227 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 1: DRIVING LOW FREQUENCY SIGNALS

3.3V

ADC0

100Ω

AD8227

REF

100nF

ADuC7026

OPTION 2: DRIVING HIGH FREQUENCY SIGNALS

3.3V

AD8227

10Ω

REF

ADC1

AD8616

10nF

OPTION 3: PROTECTING ADC FROM LARGE VOLTAGES

+15V

AD8227

–15V

3.3V

10kΩ

10Ω

REF

AD8616

ADC2

AGND

10nF

Figure 66. Driving an ADC

Rev. 0 | Page 23 of 24

1...21 22 232425

下载PDF

与AD8227ARMZ-RL1相关器件

型号	品牌	描述	获取价格	数据表
AD8227ARZ	ADI	Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier	获取价格
AD8227ARZ1	ADI	Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier	获取价格
AD8227ARZ-R7	ADI	Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier	获取价格
AD8227ARZ-R71	ADI	Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier	获取价格
AD8227ARZ-RL	ADI	Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier	获取价格
AD8227ARZ-RL1	ADI	Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier	获取价格